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Hydrofoils for Sailboats

By By Steven Callahan
Updated: July 29, 2020

Hydrofoils have been providing dynamic lift since fish sprouted fins. And people have been employing foils ever since they first put paddle to water, and certainly since adding keels and rudders to boats. But the modern, flying America’s Cup boats, kiteboards, Moth dinghies, shorthanded offshore thoroughbreds—these are all playing in a new world in which the terms “hydrofoils” or “lifting foils” describe those oriented to raise a hull or hulls from the water. In these racing realms, if you ain’t got foils, you ain’t got nothin’.

Lifting foils that allow these boats to sometimes home in on three times the wind speed might appear to be of little interest to cruising sailors, but with such common cruising features as self-steering and autopilots, self-tailing winches, rope clutches, fin keels and faster hull shapes all having been passed down from the racing scene, one must ask, “What promise, if any, do hydrofoils hold?”

Lifted or partially lifted boat patents extend back to 1869, but workable watercraft took roots along with early flight. Italian Enrico Forlanini began experimenting with foils in 1898. In 1906, his 1-ton 60 hp foiler reached 42.5 mph. Alexander Graham Bell’s HD-4 Hydrodrome flew on Bras d’ Or Lake at 70 mph in 1919. And several sailing foiler patents began appearing in the 1950s. Notably, JG Baker’s 26-foot monohull, Monitor, flew at 30-plus mph in 1955. Baker experimented with a number of foil configurations, and at least built, if not used, the first wing mast. The first offshore foiler was likely David Keiper’s flying trimaran, Williwaw , in which he crisscrossed the Pacific in the 1960s.

By the 1980s, numerous speed-trial and foil-enhanced offshore-racing multihulls showed huge promise, and have since evolved into behemoth trimarans clocking 30 to 40 knots continuously for long periods, not to mention the monohulls in the Vendée Globe (and soon the Ocean Race) that are capable of speeds exceeding 30 knots. But as boat designer Rodger Martin once reminded me, “If you want a new idea, look in an old book.” He was right. The fully foiling monohulls that will compete in the 2021 America’s Cup will bring things back full circle to the foiling monohull Monitor .

Fluid Dynamics Primer

Any foil—a wing, sail, keel, rudder or lifting foil—redirects the flow of fluid (air included), creating high- and low-pressure areas on opposite sides of the appendage, while developing lift perpendicular to the foil’s surface.

Advancements in foiling science is due in part to the hundreds of foil shapes that were tested, with tabulated results, by the National Advisory Committee for Aeronautics, the forerunner of the National Aeronautics and Space Administration. For the better part of a century now, aircraft and boat designers have been able to choose from a spectrum of refined foil sections that produce predictable amounts of lift and drag for known speeds of fluid and angles of attack, or the angle at which the foil passes through the fluid. Sections of efficient faster foils, as seen on jets or as we flatten our sails to go upwind or reach high speeds, have smaller nose radii and are thinner, with the thickest section of the foils farther aft, up to nearly halfway toward the trailing edge.

The most efficient foil sections at slow speeds are fatter, with the maximum thickness farther forward, and with larger nose radii, than faster foils. The angle to fluid flow or angle of attack also is greater. We see these slower foils on wings of prop planes and sails when off the wind or in light conditions.

Most sailors are familiar with traditional foils on boats, the teardrop sections of keels that produce lift to weather, reducing leeway, and of rudders, allowing them to steer. Even a flat plate can be a foil, but these tend to be inefficient. Such a shape is prone to fluid separation from the surface, meaning they stall easily, and they maintain poor lift-to-drag ratios. Even keels and rudders are somewhat lift-compromised because they are symmetrical and have to work with fluid coming from either side, whereas lifting foils are more like aircraft wings or propellers, with asymmetrical sections honed for performance in a more stable, fluid flow.

The point is, any foil can be employed at various angles to the surface to prevent leeway, produce increased stability, or help lift the boat out of the water. But those not required to work with fluid flowing from opposite sides can then be honed to maximize lift and minimize drag. Asymmetrical foils were used on boats like Bruce King’s bilgeboarders, including Hawkeye , back in the 1970s. And, designers, including Olin Stephens, had previously employed trim tabs behind keels to improve keel performance.

Sails, which are heeled airfoils, not only drive the boat forward, but they also produce downforce, actually increasing the dynamic displacement of the boat. To counter this and keep the boat sailing more upright, multihull designer Dick Newick first employed slanted asymmetrical hydrofoils in the outer hulls of his small charter trimaran, Lark , in 1962. A portion of the lift developed by the hydrofoil resisted leeway, while a portion worked to actually lift the leeward hull, keeping the boat more upright and reducing dynamic displacement and drag.

Anyone who has ridden on even a foil-stabilized boat will know how riding at least lightly on the waves, and especially above them, beats smashing through them. When boats lift off, everything gets a lot smoother, drag falls away, and the boat accelerates.

Cruising on Foils

But why would a cruiser want to whip over the sea? Wouldn’t this demand an inordinate amount of attention by the crew? Would lifting foils even be applicable to a boat that must have substantial displacement to carry crew and stores? Aren’t cruising-boat hydrofoils an oxymoron?

Maybe, but I believe our boats’ hulls are likely to sprout fins much as fish have as we orient foils to more efficiently resist leeway, add stability, aid steering, reduce drag, increase comfort, allow for shallower draft, and enhance wider variations in hull shapes.

Boats have gotten increasingly wide through the years to advance form stability, improve performance (primarily off the wind), and boost interior volume. But the downside is that fat boats tend to slam more upwind. What if you could reduce dynamic displacement of the boat and lift that hull even partially from the water? The result would be less slamming, especially upwind.

At the same time, what about narrower boats that are known for being more seakindly, especially when closehauled, but lack form stability to carry adequate sail area for powering upwind, and tend to roll badly downwind? Or shallow-draft vessels that are lovely for cruising, but again, tend to suffer from reduced stability? Foils can give that stability back.

Looking ahead, boat designers might choose to reduce ballast, making up for it with a foil. In short, lifting foils can reduce boat drag and motion while increasing power and performance.

Pitching also does no favors for speed or crew comfort. Foils can come into play here as well. Foils parallel to the sea’s surface resist motion up and down, and a lifted boat skating above chop also is less prone to hobby-horsing through waves. Multihulls have always been particularly susceptible to pitching for a number of reasons, but watching videos of multihulls sailing to weather show an obvious huge advantage that foilers have compared with nonfoilers. Offshore multihulls now routinely employ T-foils on the rudders to control the fore and aft angles of the boat (attitude), a feature easily adaptable to any vessel.

OK, so what’s the cost? Obviously, the more things sticking through the hull, especially if they are retractable, the more it’s going to impact the interior. There would be added weight, complexity and cost. Foils also create noise, and there’s susceptibility to damage from hitting stuff. And let’s not forget compromises with shapes, purposes and things not yet imagined.

As for damage, it’s possible to fold the foils back into the hull. Think swinging center- boards or actual fish fins. Daggerboardlike foils can at least employ shock-absorbing systems similar to the daggerboard arrangements found in many multihulls. This includes weak links that are outside the hull, so if a foil is struck, it frees the foil to fold back or to come off before being destroyed or damaging the hull. Or, foils might hang from the deck rather than penetrating the hull, allowing them to kick up (and to be retrofitted to existing boats). These configurations also relieve the interior of intrusions, and keep the noise more removed from it. I have no doubt that numerous talented designers will be exploring all kinds of options and compromises in coming years, finding ways to make foils both practical and more than worth the compromises.

Sailing more upright, shallower draft, speed, comfort—what’s not to like? Just what is possible? I have a feeling the cruising community is about to find out.

Steven Callahan is a multihull aficionado, boat designer and the author of Adrift , an account of his 76 days spent in a life raft across the Atlantic.

More: foils , How To , hydrofoils , print june july 2020 , sailboat design
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[2023] Hydrofoil Yacht: The Ultimate Guide to Sailing on Foils

November 1, 2023
Hydrofoil Basics

Quick Answer: A hydrofoil yacht is a sailboat equipped with wing-like foils that lift the hull out of the water as it gains speed. This reduces drag, increases speed, and provides a smoother ride. Hydrofoil yachts can be retrofitted on both monohull and multihull sailboats, with different types of foils used for stability and control.

Welcome to Hydrofoiling™, where we bring you all the latest and greatest information about hydrofoil boarding. In this comprehensive guide, we’ll dive into the world of hydrofoil yachts, exploring their history, configurations, classes, and more. Whether you’re a seasoned sailor or a curious beginner, this article will provide you with expert advice and insights into the exciting world of hydrofoil yachts.

Quick answer, quick tips and facts, background: the evolution of hydrofoil yachts, types of hydrofoil yachts, hydrofoil classes: from moths to ac75, hydrofoil yacht brands and models, advantages and disadvantages of hydrofoil yachts.

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A hydrofoil yacht is a sailboat equipped with wing-like foils that lift the hull out of the water as it gains speed. This lifting action reduces the wetted area of the hull, minimizing drag and allowing the yacht to achieve higher speeds. Hydrofoil yachts can be retrofitted on both monohull and multihull sailboats, with different types of foils used for stability and control.

Shopping Links: Check out hydrofoil yacht products on Amazon | Shop hydrofoil yacht on Walmart | Etsy hydrofoil yacht products

Hydrofoil yachts use foils to lift the hull out of the water, reducing drag and increasing speed.
Different types of foils, such as T foils, C foils, S foils, and L foils, are used for stability and control.
Hydrofoil yachts can be retrofitted on both monohull and multihull sailboats.
The International Moth class is one of the most widespread uses of hydrofoils in sailboats.
Hydrofoil yachts can achieve impressive speeds, with some reaching over 50 knots.

Hydrofoil technology has been around for over a century, with the first patent for a hydrofoil boat filed in 1898 by Italian engineer Enrico Forlanini. Since then, hydrofoil yachts have undergone significant advancements, transforming the sailing experience and pushing the boundaries of speed and performance.

The concept behind hydrofoil yachts is simple yet ingenious. By using wing-like foils mounted under the hull, these yachts can lift themselves out of the water as they gain speed. This lifting action reduces the wetted area of the hull, minimizing drag and allowing the yacht to glide effortlessly through the water.

Hydrofoil yachts come in various configurations, each designed to optimize performance and stability. Let’s explore some of the most common types of hydrofoil yachts:

Monohull Hydrofoil Yachts : Monohull hydrofoil yachts feature a single hull and employ a “ladder” arrangement of hydrofoils. These hydrofoils typically have a dihedral angle of around 50 degrees and are complemented by a stabilizing rudder foil. This configuration provides stability and control, allowing the yacht to sail smoothly on foils.

Multihull Hydrofoil Yachts : Multihull hydrofoil yachts, such as catamarans and trimarans, offer increased stability and performance. These yachts use wider planforms, allowing for greater lift and control. Some multihulls utilize three foils, with two main forward foils providing lift and a horizontal foil on the rudder for additional control.

Hydrofoil Catamarans : Hydrofoil catamarans, also known as foilcats, combine the stability of a catamaran with the speed and efficiency of hydrofoils. These yachts can achieve impressive speeds while maintaining excellent stability, making them popular choices for racing and recreational sailing.

Hydrofoil technology has found its way into various sailing classes, revolutionizing the way we sail. Let’s take a closer look at some of the notable hydrofoil classes:

International Moth : The International Moth class is one of the most widespread uses of hydrofoils in sailboats. These single-handed dinghies feature foiling capabilities, allowing sailors to achieve incredible speeds and maneuverability. The class has seen rapid growth since 2001, with carbon fiber foils and advanced design techniques pushing the boundaries of performance.

Waszp : The Waszp class is similar to the International Moth class but utilizes aluminum foils instead of carbon fiber. This makes the Waszp more accessible to a wider range of sailors while still providing the exhilaration of foiling.

AC75 : The AC75 is a foiling monohull sailboat class used in the 2021 America’s Cup. These impressive yachts can reach speeds of up to 50 knots, showcasing the incredible potential of hydrofoil technology in the world of competitive sailing.

IQFoil : The IQFoil windsurfer class was selected by World Sailing for the 2024 Summer Olympics. These windsurfers feature hydrofoils, allowing athletes to glide above the water and achieve impressive speeds.

IMOCA 60 : Originally designed as non-foiling offshore racers, the IMOCA 60 class has embraced hydrofoil technology. These yachts now feature S-shaped daggerboard foils, providing partial foiling capabilities and enhancing performance in various conditions.

F50 : The F50 sailboat class is used in the SailGP series and is the first sailboat class to break the 50-knot barrier during a race, with a top speed of 52.2 knots. These high-performance catamarans showcase the incredible speed and agility that hydrofoil technology can offer.

Several brands have embraced hydrofoil technology, offering a range of hydrofoil yachts to cater to different sailing preferences. Here are some notable hydrofoil yacht brands and models:

Gunboat : Gunboat is a renowned brand in the world of luxury hydrofoil yachts. Their models, such as the Gunboat 68 and Gunboat 72, combine performance, comfort, and elegance, providing an exceptional sailing experience.

GC32 : The GC32 is a hydrofoil catamaran designed for high-performance racing. This foiling catamaran offers thrilling speeds and precise control, making it a favorite among competitive sailors.

AC72 and AC45f/AC50 : These hydrofoil catamarans were used in the America’s Cup, showcasing the cutting-edge technology and innovation in the world of hydrofoil yachts. These yachts pushed the boundaries of speed and performance, captivating sailing enthusiasts worldwide.

Nacra 17 and Nacra F20 : Nacra is a well-known brand in the world of multihull sailing, and their Nacra 17 and Nacra F20 models feature hydrofoil capabilities. These yachts offer a perfect balance of speed, stability, and maneuverability, making them popular choices for recreational and competitive sailing.

Hydrofoil yachts offer a range of advantages that make them appealing to sailors seeking speed, performance, and an exhilarating sailing experience. However, they also come with some drawbacks. Let’s explore the pros and cons of hydrofoil yachts:

Advantages:

Increased Speed : Hydrofoil yachts can achieve impressive speeds, thanks to reduced drag and increased lift. This allows sailors to cover more distance in less time, making hydrofoil yachts ideal for racing or simply enjoying the thrill of speed on the water.

Smooth Ride : By lifting the hull out of the water, hydrofoil yachts provide a smoother and more comfortable sailing experience. The reduced contact with the water minimizes the impact of waves and chop, resulting in a smoother ride even in rough conditions.

Improved Efficiency : Hydrofoil yachts are more efficient than traditional sailboats, thanks to reduced drag and improved lift. This increased efficiency translates to better performance and reduced energy consumption, making hydrofoil yachts an environmentally friendly choice.

Disadvantages:

Complex Design : Hydrofoil yachts require a more complex design compared to traditional sailboats. The addition of foils and the associated control systems can increase the complexity of the yacht, requiring more maintenance and potentially higher costs.

Learning Curve : Sailing a hydrofoil yacht requires a certain level of skill and experience. The handling and control of a hydrofoil yacht can be more challenging compared to traditional sailboats, requiring sailors to adapt to the unique characteristics of foiling.

Higher Costs : Hydrofoil yachts, especially high-performance models, can come with a higher price tag compared to traditional sailboats. The advanced technology, materials, and design required for hydrofoil yachts contribute to their higher cost.

How fast is the hydrofoil racing yacht?

Hydrofoil racing yachts can achieve impressive speeds, with some models reaching over 50 knots (57.5 mph or 92.6 km/h). The F50 sailboat class, used in the SailGP series, holds the record for the fastest sailboat class, with a top speed of 52.2 knots (60 mph or 97 km/h).

What does a hydrofoil do to a boat?

A hydrofoil lifts the hull of a boat out of the water as it gains speed. This reduces the wetted area of the hull, minimizing drag and allowing the boat to achieve higher speeds. The lifting action of the hydrofoil also provides a smoother ride by reducing the impact of waves and chop.

Read more about “… Hydrofoil Catamaran: The Ultimate Guide to Foiling on Water”

How fast do hydrofoil boats go?

Hydrofoil boats can reach impressive speeds, depending on their design and purpose. Racing hydrofoil yachts can achieve speeds over 50 knots (57.5 mph or 92.6 km/h), while recreational hydrofoil boats can reach speeds of 20-30 knots (23-34.5 mph or 37-55.5 km/h) or more.

Why don’t boats use hydrofoils?

While hydrofoils offer significant advantages in terms of speed and efficiency, they also come with certain limitations. The complex design and higher costs associated with hydrofoils can be prohibitive for some boat owners. Additionally, the handling and control of hydrofoil boats require a certain level of skill and experience, making them less accessible to novice sailors.

Read more about “… Why do boats not use hydrofoils?”

Hydrofoil yachts have revolutionized the sailing experience, offering increased speed, improved efficiency, and a smoother ride. Whether you’re a competitive sailor looking for the thrill of high-speed racing or a recreational sailor seeking a more exhilarating sailing experience, hydrofoil yachts provide an exciting and innovative option.

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By SuperyachtNews 01 Oct 2020

Foil-assisted cruising by Baltic Yachts

The innovative dynamic stability system offers major benefits for the large cruising yacht sector….

First adopted a decade ago by small racing yachts and, more recently, making the headlines as a key feature on board the latest America’s Cup boats, foil technology is typically associated with high-performance and high-speed sailing. However, Baltic Yachts ’ adoption of the innovative Dynamic Stability System (DSS) from Infiniti Yachts is changing this out-dated perception and proving that the foil technology offers major benefits for the cruising sector. As testament to this, the recently-delivered Baltic 142 Canova is the largest DSS foil-assisted yacht ever built, with the main aim of the technology being to improve on-board comfort as well as performance.

“The average cruising sailor might dismiss a foil as complex technology that makes the boat more difficult to handle with increases in speed and sensitivity, but this is not the case at all,” explains Henry Hawkins, executive vice president at Baltic Yachts. “The deployment of the DSS foil within a cruising environment actually stabilises the boat, making sail handling and control of the boat easier and safer. One of the key benefits is the reduction in heel angle and pitching, which dramatically increases comfort levels for those on board. There are also significant performance gains to be achieved, but this is not necessarily the primary focus for employing the DSS foil on cruising yachts and certainly wasn’t on Canova .”

While the development of the Infiniti-designed DSS foil has been an engineering feat for Baltic Yachts, working in conjunction with partners Farr Yacht Design, ISOTOP and BAR, the system has been simplified to make it as bulletproof as possible. “We wanted to ensure that something so apparently complex was made as simple and reliable as possible,” adds Roland Kasslin, head of research and development at Baltic Yachts. The system comprises a retractable foil built into the yacht just above the waterline. As the wind increases, the yacht heels and the foil is projected underwater to leeward, counteracting the heeling force and creating lift so that the yacht sails more upright.

As a result, Baltic 142 Canova is proving to be more comfortable than any comparable sailing yacht. The DSS foil package has seen reduced heel angles of between eight to 10 degrees, as well as significant pitch and heave damping, both of which dramatically enhance comfort for those on board and reduce motion and strain on the helmsman. During Canova ’s first long-distance passage, the yacht crossed the Bay of Biscay in 50-plus knots of wind and big seas, but the deployment of the foil made the passage comfortable for all on board.

“For inexperienced sailors, heel angle is one of the aspects about large sailing yachts that people fear the most and can make life on board untenable – a heel angle of 18-plus degrees on a 43m yacht with a 9m beam creates a considerable sloping deck,” says Hawkins. “This significant reduction in heel angle means that moving around the boat is much easier and safer, making long passages more enjoyable.”

“This significant reduction in heel angle means that moving around the boat is much easier and safer, making long passages more enjoyable...”

Another benefit of the additional stability that the DSS foil provides is that less keel weight is required, which has the knock-on advantages of less required sail area, draught and overall displacement. Therefore, a lightweight hull in carbon composites ideally suits the system – Canova displaces just over 145 tonnes lightship. For this reason, it is important that the decision to include a DSS foil is made right at the beginning of a project, as retrofitting the system is not always the optimal solution.

While Canova is the largest yacht to be fitted with a foil by a significant amount, the scope of the DSS is boundless. “The technology is scalable as long as there is the technical space for it, and the bigger the boat, the more possibility there is for that,” advises Kasslin. “It would also be a weight-conscious decision: if you are deploying a foil then the boat needs to be able to achieve a certain speed in order to overcome the natural drag that the foil will produce.”

Thanks to its outside partners and, crucially, one brave and forward-looking client, Baltic Yachts has pushed the boundaries of foil technology and proven its benefits to the superyacht industry. The industry is naturally cautious towards innovation, and therefore adoption of foil-assisted cruising has taken time. However, the success of the DSS foil on board Canova is changing attitudes and, combined with the increasing use of foils on racing yachts, the technology is set to become more popular in the cruising sector, with Baltic Yachts paving the way.

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F1x A-class foiling catamaran

World champion, lighter = better, craftsmanship, meet the foiling f1x a-class catamaran.

This is the ultimate singlehanded foiling catamaran of the moment: ultramodern, incredibly fast, very agile, extremely strong and feather-light, in an aerodynamic and ergonomic design. The perfect total package, packed in 1 foiling catamaran. This is the world’s coolest boat for singlehanded races and the winner of several A-cat world championships and many other sailing races.

The 2020-F1x A-cat is exactly the same foiling catamaran that made Mischa Heemskerk Vice-World Champion at the Herveybay Worlds 2018 in Australia and World Champion at Weymouth 2019. All our foiling F1x A-class catamarans come straight, ready to race and ‘Mischa-tuned’ from our factory.

Unique design enables top performances

The F1x A-class foiling catamaran is the ultimate reflection of our current design language. The aerodynamic design accentuates the performance qualities of this super fast foiling racing boat. The sophisticated deck plan provides clear control and minimal air resistance.

Foils The rudders and daggerboard foils used on the F1x A-class foiling catamarans are produced with the highest quality carbon pre-preg fibers. The foils are cured in our own Autoclave . Our winning foil design was created in close cooperation with Glenn Ashby and the designers of AC Team New Zealand .

Construction The F1x A-cat is manufactured entirely according to the carbon pre-preg/ Nomex production method, and cured in our Autoclave. This technology is the same as used in the aerospace industry and within other foiling boats like for example, the America’s Cup.

Design The design of the F1x foiling A-class catamaran was completely conceived by the DNA design team and made at DNA’s own yard. In the DNA design team Pieterjan Dwarshuis, Mischa Heemskerk and the renowned Dutch industrial design engineer Rudo Enserink worked closely together to create the perfect foiling A-class catamaran.

We build your new foiling boat!

Technical details.

The F1x A-class foiling catamaran has a number of unique features that improve performance. For example:

Semi ridged trampoline. Gives extra torsional stiffness to the boat and increases its aerodynamic characteristics.
Patented main-sheet-wheel-system. For more direct and faster trim of the main sail.
Aerodynamically placed traveller car.
Flexible daggerboard casings. For minimal water absorption in floating mode.
Aerodynamically shaped ‘beams’.
Adjustable T-rudders. Foiling with rudder differential is possible.

Specifications

LOA: 5.49 m BOA: 2.30 m Max. draught: 1.20 m Sail area: 13.94 m Total weight: ca. 53 kg Top speed: 31 kn Extra: All measurements according to IACA Class regulations.

Buy a champion's boat!

Are you excited to buy a F1x A-class foiling catamaran from DNA Performance Sailing? Please fill in our contact form:

Yes, I want a F1x A-cat!

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12 foiling boats for sailors of all levels

April 15, 2022
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THE PERFECT GIFT!

Give or treat yourself to a subscription to the print + digital Journal of Sailing and for only 69 euros a year you get the magazine at home plus read it on your PC, smartphone and tablet. With a sea of advantages.

There’s no denying that the phenomenon of the moment, when it comes to having fun, is foiling boats (as Checco Bruni told us himself in this article). In the wake of the latest editions of the America’s Cup, flying boats, especially in the dinghy segment, have become increasingly widespread. On one or two hulls, with one or more foils, more or less easy to fly, single or crewed.

We have selected for you 12 flying boats with which to enter the world of foils or with which to try and perfect your skills. We also tell you how much they cost and the “difficulty of flight” (XXX: difficult; XX: medium; X: easy). The only common denominator is that they are great fun!

Birdyfish – 4,7 m – For foiling beginners

Flying difficulty: X

The ideal boat for learning to sail foils, even for beginners. Very few trim adjustments for foils allow you to enjoy all the excitement and joy of flying. The crew will only have to deal with sail trimming. The appendages with a soft-angled L guarantee take-off from 10 knots of wind. The shape of the bow works well even in waves. Price: 16,980 euros.

FIND OUT MORE

Flo1 – 4.25 m

Flying difficulty: X

An interesting single to approach and perfect in the world of small foilers before moving on to more sophisticated craft. Produced by the Dutch company Aeronamics, it has a soft, almost C-shaped foil. There is no adjustment of the rake of the appendages but only its extension in the water, which makes the “trim” of these appendages easy and intuitive after just a few trips. Top speeds are around 20 knots. Price: 15,495 euros.

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NACRA F20 – 6,20 m – Like America’s Cup cats

Flying difficulty: XXX

The Nacra yard, which specializes in open catamarans and produces the Nacra 17 Olympic class, has fitted its F 20 model with a “Flight Control System” to make it fly. The Nacra 20 FCS was designed by Pete Melvin and Gino Morelli, the authors of the 2013 America’s Cup rulebook, and its foils are reminiscent of those on the AC72 in San Francisco. A very physical boat and not for everyone. Price: 34,000 euro.

Foiling Dinghy – 3,86 m – Small and versatile

It weighs 30 kilos and can be foiled as early as seven knots of wind. The Foiling Dinghy is equipped with an inverted T rudder and a pair of curved foils that act as both lifting and straightening foils, with an automatic management system. The foils have a few simple adjustments depending on what you want to achieve (more flying or more straightening). Price: 15,500 euros including taxes.

Moth – 3,35 m – The foiling cult dinghy

The progenitor of the flying dinghies is still one of the most complete single foilers on the market today. Suitable mainly for advanced sailors who already have experience on foils, it has appendages that offer multiple setting options and the possibility of being changed according to wind strength. The international class is one of the most active and always organizes very crowded races. Cult product. Price: from 20,000 euros.

Peacoq 14 – 4.70 m – Like a flying Fireball

Flying difficulty: XX

With a hull that is vaguely reminiscent of the old Fireballs with a “cut” bow, the Peacoq 14, an evolution of the Club version, is a dinghy that can be a compromise for both novice and experienced foil sailors. In fact, the dinghies can be operated in automatic trim, or more experienced sailors can adjust their angle for maximum performance. Price: quote on request.

Persico 69F – 6,9 m – The trendy boat

This concept boat is the brainchild of the Italian racing elite (Giorgio Benussi, Dede de Luca, “l’oriundo” Maciel Cicchetti) and was designed by Argentineans Wilson and Marquinez. Flying the 69F is not too difficult, although it does require a good physique and strength in the arms, especially for the mainsail trimmer and the foil adjuster. The racing circuit has now been launched with an attractive programme. Price: rented by the season.

Skeeta – 3,35 m – Easy for anyone

Ease first. The idea behind Skeeta is the same as that of many other small foilers: to make this type of wing easy and open to everyone. Skeeta is a single glider that flies on two self-regulating appendages, not particularly technical to fly but still very high performance, with the particular shape of the hull that distinguishes all Quant models. Price: 15,345 euros.

Stunt S9 – 4,16 m – The Italian Foiling cat

This is an all-Italian One Design catamaran that can be sailed as a single with just a mainsail or even a jib depending on the weather conditions. Like other catamarans, to improve stability in flight, it moves on four submerged appendages. Physically it requires a certain amount of athleticism, also because there is a trapeze, but with a little training it can be suitable for a wide audience. Price: 16,600 euros.

Ufo – 3,00 m – Flying with two hulls

This small catamaran is equipped with a sensor that self-adjusts the inclination of the single central foil, coupled to the T of the rudder. It can take off even in light winds thanks to the lightness of its construction. The cat is quite easy to sail, suitable even for sailors who do not have much experience with foils.

The official european dealer for Foiling UFO is Sea-Change . Price: 8.980 euros + VAT

Waszp – 3,35 m – For the whole family

Very similar to the Moth, but with one big difference: the Waszp is a monotype, it is not made of carbon and the appendages being monotyped cannot be changed. For this reason it is less expensive than the Moth, even if it does perform somewhat less well. It is considered by many to be an ideal “family” boat because it is fun for both young and old. The foil adjustment system is managed by a sensor, but it is possible to set the appendages and modify some adjustments. Price: 12,200 euros.

Whisper – 5,40 m – Full performance

As light as the highest performing Cats, it features a one-piece, non-removable platform that provides great structural rigidity. Equipped with the four classic self-adjusting appendages, it is able to set sail in light breezes with a certain ease. It is a double, with trapeze, mainsail, jib and gennaker, fast even in light winds. Physically demanding. Price: 26,900 euros.

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Boat of the Year 2020 F101: Best Foiler

By Dave Reed
Updated: December 10, 2019

At A Glance

Price As Sailed: $24,750

Design Purpose: Learn to foil, advance skills

Crew List: One or two

Rob Andrews and his business partner Alan Hillman have been teaching foiling for a few years now, and one thing they’ve learned is we get better by sailing, not by swimming. Thus was the genesis of the F101, a craft with which they could teach the fundamentals of foiling—without the crash and burn. But it’s not just a learn-to-foil boat, either. It’s a platform with which new and experienced converts alike can take their foiling skill set to a higher level.

The key to mastering the F101, Andrews explains, is grasping righting moment. With the trimaran platform, you get plenty of it, as well as a stable boat that’s more forgiving than any other small foiler. “The trimaran configuration gives you righting moment direct from the foil in the middle hull,” he says, “and gives a measure of safety. It’s hard to capsize the boat.”

The judges learn as much when it comes time to sail the F101. In 15 knots and more, and a steep Chesapeake chop, Powlison is first to give it a go. He settles into the boat, gets his bearings, perches skittishly on the weather hull, sheets on the mainsail (no need to use the boat’s gennaker above 12 knots) and off he goes like a bat out of hell, popping up on the foils without even trying.

“The trick is getting used to the sensation of heeling to windward,” he says. “It takes a bit of trust. Once foiling, it’s quiet and fast, and I felt like I had to be really active on the mainsheet to keep it on the foils.”

That’s true of any foiler, but the beauty of the F101, the judges agree, is when you do lose it, it’s no big deal. The boat drops off its foils, the bows auger in and you get a face full of water; but just reset, bear away and try again.

“The hull shape picks up the buoyancy gently,” Stewart says, “which makes it depress smoothly and prevents it from pitchpoling. When I dumped it a few times I thought I was going in, but not a chance. You quickly realize there’s plenty of floatation there to save you. In flat water, with one day of training you’d get up to speed quickly.”

When teaching people to foil, Hillman starts with “skimming,” a ride height barely above the surface. As the sailor becomes more accustomed to how the boat behaves, there’s a simple line adjustment at the foil head: Dial it up one setting and increase your ride height.

As you’re sailing, the foil wand hanging behind the trailing edge effectively feels where the boat is riding relative to the water and actuates the main flap. In light winds, it gives you more lift, and the boat pops up on the foil. Get too high, and the wand drops down even further, forcing negative lift on the flap, which brings you back down to your desired height and prevents the foils from breaking the surface.

In terms of construction, the judges praise its carbon-and-epoxy build quality and the all-up weight of 180 pounds, which makes it easy to get to and from the water. With the F101 sitting on its dolly in the boat park, going sailing is as simple as pulling back the covers, hoisting the main and launching from a dock, beach or boat ramp with minimal fuss.

“What I like about it is that it’s one of those boats that you buy and don’t need to add anything to it,” Allen says. “There’s nothing to change out or upgrade.”

For simplicity, the boat is set up with adjustments that let you ratchet up the experience as you climb the learning curve. On the rudder foil, for example, there is a clear numbering system so that as you twist the tiller extension, you change the rudder rake. The baseline setting is zero, and it’s the same for the main foil. The only thing left is to balance the forces with the mainsheet.

“When I first got up on the foils, I was thinking to myself, ‘This is too easy; I should be working harder,’ ” Powlison says. “As they said, this boat solves a lot of the problems associated with other foiling dinghies. It’s a great high-performance boat that represents the next step in making foiling accessible to the public.”

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Discover the Magic of Hydrofoil Sailboats

Last Updated by

Daniel Wade

December 11, 2023

‍ Key Takeaways

Hydrofoil sailboats blend speed, stability, and innovation for a fun sailing experience.
Their design lifts the hull above water, reducing drag and enabling high-speed travel.
Advanced control mechanisms maintain stability in varying wind conditions.
Sails and hulls are meticulously engineered for optimal aerodynamics and lift.
Ongoing innovations in foil technology continue to propel hydrofoils to new heights.

‍ Based on their innovation and nature, the world of hydrofoil sailboats are magical, to say the least. But what exactly makes them so exceptional?

The magic of hydrofoil sailboats lies in their extraordinary speed. They can achieve remarkable speeds that were once thought impossible for sailboats. Their unrivaled stability and cutting-edge technology redefine sailing, offering a thrilling blend of innovation and performance.

Over the years, I've dedicated myself to mastering the intricacies of the yachting world, not just as an observer but as an active participant in the hydrofoil sailing community. My knowledge extends beyond the surface, encompassing the technical aspects of hydrofoil design and the thrill of high-speed sailing. As such, I’ll provide a comprehensive and engaging exploration of what sets hydrofoil sailboats apart, making them truly magical on the waters.

Table of contents

‍ Discover the Magic of Hydrofoil Sailboats

Hydrofoils saw their early development as a concept for enhancing speed and efficiency on the water. From Alexander Graham Bell's experiments to the application of foils on sailboats in the 1950s, the quest has always been for greater speed.

But it wasn't until Russell Long championed these designs with the CEC foiling catamaran and the development of the Hobie Trifoiler that hydrofoils began to carve a distinct niche in the sailing world.

This sailboat operates on a simple yet ingenious principle: as the speed increases, the foils submerged beneath the boat generate lift. This lift thrusts the boat's hull above the water, dramatically reducing drag.

It’s similar to how air flows around the wing of an airplane, only with water's denser environment offering a different dynamic. This revolutionary foiling system allows boats to glide over waves, offering an incredibly smooth ride.

The variety of hydrofoil sailboats is astounding, from the foiling catamarans that have revolutionized the America's Cup to the twin sail trimaran designs. The fastest production sailboat, the Hobie Trifoiler , showcases what hydrofoils are capable of.

Additionally, boats like the innovative Emirates Team New Zealand vessels continue to push the boundaries of technology in competitive sailing. Whether for recreational purposes or high-speed racing, the range of hydrofoil sailboats caters to different sailing experiences and preferences.

Now, let’s explore the various aspects of hydrofoil sailboats that make them truly magical.

The Thrills of Hydrofoil Sailing

When I first stepped onto a hydrofoil sailboat, I knew that sailing would never be the same for me. Harnessing the power of the wind to achieve remarkable speeds while hovering above the water was nothing short of revolutionary.

It's an adrenaline-infused blend of sailing, flying, and innovation that promises high performance and stability with a significant reduction in wetted areas.

The allure of hydrofoiling is not just about the speed; it's the sensation of flying over the waves, defying the conventions of traditional sailing. With each gust, my hydrofoil sailboat becomes a silent, swift car, slicing through the air rather than merely sailing on the water.

When sailing with hydrofoils, you get to experience the following benefits.

High Speed: With hydrofoils, I've seen and achieved speeds I never thought possible on water.
Less Wetted Area: As the hydrofoils lift the hull out of the water, drag is reduced, further contributing to the craft's efficiency and speed.
Stability: Surprisingly, the flying sensation is accompanied by stability once airborne, making the ride smoother.

The America’s Cup Competitive Foiling

Over the years, I've witnessed first-hand how hydrofoil technology has radically altered the landscape of competitive sailing. The introduction of hydrofoils has not only redefined what we consider possible in the sail area but has also brought a fresh surge of excitement to the racing circuit.

The most illustrious event in sailing, the America's Cup , underwent a transformation with the embrace of hydrofoils. Emirates Team New Zealand, a frontrunner in hydrofoil innovation, redefined the America's Cup racing in 2017.

Alongside them, the US team and Luna Rossa played pivotal roles in reshaping the landscape of America's Cup racing.

With their AC50 class catamarans soaring above the waves at top speeds that defy traditional sailing limits, they clinched the title and shifted the focus of competitive racing toward technological prowess.

The spectacle of these vessels racing is not just about the crew's capabilities but equally a testament to engineering marvels.

Also, the advent of hydrofoils in racing has certainly led to a spike in performance metrics. Here's a concise table highlighting the before and after impact of hydrofoiling in competitive Sailing:

This table illustrates just how much the racing landscape has shifted; it's not only sailing anymore.

It’s similar to piloting a high-speed aircraft, with each crew member playing a crucial role in harnessing the raw power of the strong winds in harmony with state-of-the-art technology. Watch this video for a more detailed explanation of hydrofoil sailboats and their magical power.

Technical Aspects of Hydrofoil Sailboats

In diving into the technical aspects of hydrofoil sailboats, I'll give you an insight into the intricate designs that enable these marvels to glide above the water, as well as the cutting-edge foil technology propelling them.

The design of a hydrofoil sailboat revolves around its capability to elevate the hull above the water, reducing drag and enabling high wind-speed travel. Control mechanisms are central in maintaining stability, especially when the sailboat interacts with varying wind conditions or maneuvers through shallow waters.

The hull's length and overall design are calibrated for balancing aerodynamics with hydrodynamics. In designing sails and hulls for foiling, one must carefully balance the need for power with the propensity for lift.

The sails are tailored not only to harness the wind's energy effectively but also to match the unique mechanics of a vessel in flight. Meticulous engineering ensures that the sail configuration works in harmony with the foils to propel the sailboat forward swiftly.

Additionally, the foil technology, which is pivotal to modern hydrofoils, has undergone significant further development over the years . From the materials used to the manufacturing processes, every element incorporates the latest in technology to yield extreme performance.

Advancements have led to foils that can automatically adjust to sailing conditions and speed, which is instrumental for achieving and maintaining high speeds.

Currently, the future of hydrofoil technology seems bound for even further breakthroughs. Customization and refinement of foils for specific water conditions, such as the challenges posed by shallow water, are ongoing.

Each new iteration builds upon the last, consistently advancing the field and informing the next leap in hydrofoil sailing. This persistent innovation in foil and hull technology is a testament to the potential that lies ahead for hydrofoil sailboats.

Are Hydrofoil Sailboats the Right Options for You?

Hydrofoil sailboats offer a unique and thrilling sailing experience, but whether they are the right option depends on your preferences and goals. These high-performance vessels are known for their exceptional speed and stability, making them ideal for thrill-seekers and competitive sailors.

If you're passionate about cutting-edge technology and want to push the boundaries of traditional sailing, hydrofoil sailboats could be a perfect fit.

However, they may require a learning curve for beginners and are typically more expensive than traditional sailboats.

Consider your skill level, budget, and desire for speed and innovation when deciding if hydrofoil sailboats align with your sailing aspirations.

The Future of Hydrofoil Sailboats and Their Transformative Potential

Over the years, I've been captivated by the evolution of sailing and the recent advancements in hydrofoil technology, which promise a thrilling future for these marine crafts.

The technology supporting hydrofoil sailboats is rapidly advancing, bringing us closer to a world where boats gliding above the water's surface is a common sight.

These boats use 'wings' or foils submerged in water to lift the hull above the surface, reducing drag and allowing for greater speeds. This innovation is not just limited to racing but is expected to influence recreational and transport vessels in the future.

Today, we see hydrofoils in action with hydrofoil kiteboards, which have become popular among thrill-seekers. This is due to their ability to harness wind power and achieve impressive acceleration and agility on the water. This same principle is being applied to larger sailing vessels, where performance and sustainability converge.

The further development of hydrofoil technology involves intensive research into materials and design optimizations that can handle the challenges of varied sea conditions.

Electric and solar-powered hydrofoils are on the horizon, poised to significantly impact our world by offering greener alternatives to traditional boats.

Notably, the trends in hydrofoiling indicate a shift towards more sustainable sailing, utilizing advancements in electric propulsion systems to complement the inherent energy efficiency of hydrofoil designs.

The goal is a fleet of sailboats that are not just faster but more eco-friendly, promising an exciting future where the joy of sailing is in harmony with the health of our oceans.

I've personally had thousands of questions about sailing and sailboats over the years. As I learn and experience sailing, and the community, I share the answers that work and make sense to me, here on Life of Sailing.

by this author

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Foiling 101

The F101 takes you through your foiling journey, providing a progression pathway from the beginner foiler to the Olympian. F101 sets new challenges and goals at whatever level you come in, from expert to beginner.

The F101 is an all-new foiling trimaran aimed specifically at those sailors that, for whatever reason, thought foiling was too difficult for them. The concept originates from the experience of teaching many people to foil in the International Moth class and addressing the main barriers they faced. So we set about creating a new boat without the design restrictions of a box rule – in this way, foiling has been made easier.

“The boats are great fun and I was foiling after about 10 minutes on the first day and having extended periods of foiling after day 2. Not having sailed dinghies for the better part of 20 years, I never really expected to foil, so the boats are fulfilling their designed purpose beautifully. ” — Pete Selby

As an F101 owner, you get access to all of this knowledge and experience, plus access to the F101 Tribe.

The F101 Tribe is an exclusive social media channel that only owners can access, share experiences, tips, and events and generally have a fun time with foiling at the heart of the journey. It is like having a 24/7 help desk..someone, somewhere in the World, is normally awake to help!

The ethos of Foiling World and the F101 TRIBE is to:

· Sail a Fun boat

· Sail with great friends

· Sail in great locations

The F101…more than just a boat! We guarantee to get you foiling, wherever you are in the world, as remote as you like. If you buy an F101, you will FOIL! GUARANTEED!

Whatever your chosen medium, whether it’s a phone, email, text or WhatsApp, we will get back to you!

You can find our phone number and email over on the right-hand side of this page. What are you waiting for?

Few companies give you direct access to this amount of experience, not just before purchasing a boat but throughout your foiling journey.

Got a question? Looking to become an F101 Tribe member? We’d love to hear from you! Contact us .

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Just enjoy high speed - foiling

” iFLY – Born to FLY “

Just enjoy foiling, ” high performance sailing “, ” we love speed “, ” join the adventure “.

iFLY15 – Technical SPECS

Length 4.63 m, 15 ft..

A Foiling Catamaran for 1-2 person(s) does not need to be any longer than this. The ancient rule that says you need length to achieve speed does not apply, as hulls do not touch the water at most times.

Width 2.50 m.

This width provides plenty of righting moment, still being road legal ato be transported in horizontal position without disassembly.

7.5 m mast / 11.2 sqm mainsail

7.5 m mast with 11.2 sqm deck-sweeper mainsail. – 8.5 m mast on iFLY RAZZOR Pro with bigger rig

Draft: 95 cm

Weight: 90 kg.

90 kg ready to sail. A very light boat, providing nonetheless excellent stability for everyday suitability.

Crew 1-2 - max.180kg

Flysafe® foil control.

T-Foils Main Foils and Rudders FlySafe automatic dynamic foil control Additional Option: Main Foil Differential >>>

Know More >>>

Different - Rig Options

LATEST DEVELOPMENT OF “DECK SWEEPING” MAINSAIL THE ROLLABLE HERU WING RIG LIGHT WIND FORESAIL «CodeF»

Full Carbon Hulls

Looking for the perfect setup for your foiling sailboat.

We can recommend the best iFLY setup and accessories for your boat. Get in touch for the ultimate sailing experience!

Performance

A great number of innovations all over the catamaran and the perfect match of all components allow controlled high-speed foiling experience. iFLY15 is full of innovations, e.g. in hull design, hydrofoils, rudders, automatic flight control system, two-layer wing trampoline, high performance rig…

HULL Design

full carbon – lightweight – performance design: Born to foil

High Performance Rig Options

LATEST DEVELOPMENT OF “DECK SWEEPING” MAINSAIL WORLD PREMIERE: THE ROLLABLE HERU WING RIG : WORLD PREMIERE: LIGHT WIND FORESAIL «CodeF». ALLOWS UPWIND FOILING (as well as other courses/points) ALREADY IN EXTREMELY LIGHT BREEZE. Know More >>>

Two Layer Trampoline

AERODYNAMIC INNOVATIVE WING TRAMPOLINE CREATING LIFT.

Full Carbon T-Foils

SCIENTIFICALLY DEVELOPED high-end foils for early take off, high speed and maximum stability.

flySafe® dynamic foil control system

The foils are controlled independently, dynamically and precisely on both sides by the flySafe® foil control system . This enables high performance sailing through stable flight. The unique foil control system of IFLY15 is a 7 years proven system developed by CEC Catamarans. Know More >>>

IFLY MAIN FOIL DIFFERENTIAL TECHNOLOGY

MDT FOIL CONTROL – iFLY rake control The sophisticated main foil differential is an active flight assistance – The Rake is adjustable while sailing. Advanced Rake Control is for the experienced, performance-oriented Catamaran sailors / pro sailors and is a feature on the iFLY RAZZOR Pro. Know More >>>

Innovations and more >>>

In the hand of the experienced sailor, iFLY15 is a high-performance racing machine. STABILITY IS NOT CONTRADICTORY TO HIGH PERFORMANCE OR SPORTINESS , on the contrary, it is a prerequisite for safe reaching and maintaining constant high speeds. Stable flight allows the sailor to concentrate on the course, on the wind, as well as on opponents and strategy – rather than permanently getting distracted by working on the foiling balance.

EARLY TAKE OFF IN WINDS AS LOW AS 2Bft. / 6 KNOTS , by combining the innovative “KickOff” foil control with a trampoline that provides boost and with the latest generation of rig and foils.

BOAT SPEEDS FAR BEYOND DOUBLE WIND SPEED CAN BE ACHIEVED . Enjoy high speed foiling with top speeds far beyond 25 knots – in ideal conditions up to 30 knots.

CONTROLLED FOILING EVEN IN THE UPPER WIND RANGE BEYOND 22KNOTS OF WIND SPEED – supported by the new FlySafe® Automatic Foil System.

FOILING PLEASURE AND PERFORMANCE ALSO IN CHOPPY WATERS

FREEDOM ! FLYING SOLO OR OPTIONAL WITH CREW . You have the choice. No manhunt for crew. But still enjoy the opportunity of taking a friend or family to fly with you. Up to 140kg of crew weight. (To keep the boat and especially the mast light, we specified the iFLY15 components intentionally not for double trapeze.)

NO HOISTING AND LOWERING OF DAGGERBOARDS while sailing. (Only for beaching or in shallow waters.)

FREEDOM TO SWITCH BETWEEN FLYING MODE OR SAILING AS A CONVENTIONAL CATAMARAN (with at least the leeward hull touching the water). Within seconds iFLY15 can be switched to Non-Flight mode, even while sailing. In that mode, iFLY15 will not take off, but the foils will still create lift and give an extra agile sailing behavior, which is on the same time very stable as rudder Foils will avoid pitch poling. Non-Flight mode is providing additional security in extreme high wind speeds. It is also useful for less experienced sailors or in all situations, where taking off is undesirable (e.g. in the harbor or while towing…).

EASY TO LEARN FLYING BY AVERAGE SKILLED AND TRAINED SAILORS

EASY BEACHING AND SLIPPING , as simple as with any conventional beach catamaran by using a standard catamaran beach trolley. Foils remain flat under the keel, with the daggerboard lifted as on a conventional catamaran.

SIMPLE TO DISASSEMBLE PLATFORM . Width of 2.50m is also road legal in most countries for horizontal transport without disassembly.

DAGGERBOARDS CAN BE PLUGGED IN FROM ABOVE and Foils securely anchored from below with one central screw.

FAST SET-UP OF THE iFLY15 FROM ROAD TRAILER TO SAILING . Simple rigging the mast, no genacker boom, no foresail, no spi.

SILENT AND CALM PLANING ABOVE THE WAVES . Flight height of up to 90cm, avoiding even high waves below.

EASY TO FOIL THE JIBE (without landing). Stable maneuvers are made easier by the fact that the four T-Foils always remain in the water.

« INTERNATIONAL FORMULA 15 FOIL » Class Association. The new development class for FOILING, SINGLE HANDED on MULTIHULLS. Multi manufacturer class in the tradition of a Formula18, A-Class or international Moth. Enables large regatta fields and evolution of the boats, following the technical progress (which is especially essential in the case in Foiling). Strict regulations to avoid uncontrolled exaggerated development.

Contact : [email protected]

Catamaran Europe Central

The iflysail team, is looking forward to your message, more to know about ifly foiling , interesting tech, high performance rig options >>>, flysafe® dynamic foil control system >>>, ifly main foil differential technology >>>.

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Sailing the new foiling Birdyfish dinghy

March 24, 2022

The BirdyFish is a dinghy that aims to make foiling accessible to sailors of all levels. François Tregouet took it for a test sail to see if it really does bring foiling within reach

Based on an engineering school graduation project, three young Frenchmen have created the BirdyFish, a dinghy that aims to make foiling accessible to everyone.

BirdyFish is the story of a sailing start-up, something western France does well. Near Nantes, Jean-Baptiste Morin, Pierre Rhimbault and Alban Satgé were not yet 25 years old when they started out to create a new class of boat. Foiling designs fascinated them, from the Mini Transat small yachts to IMOCA 60s , but they wanted to make flying on the water easier.

Ambitious but realistic, the trio focused on the business and management of the project, and turned to specialists for key areas. Naval architect Etienne Bertrand, well known for his work on the Mini, was commissioned to design the BirdyFish, whose beamy bow is reminiscent of the 6.5m Mini ocean crossing scows.

With their personal savings and a €10,000 grant from a foundation for young entrepreneurs, they built a prototype. Three years later they’re on the verge of finalising a €250,000 fundraising operation and moving to 600m² premises to scale up to mass production.

While the hulls are subcontracted a few kilometres south, the foils are built in Nantes, in-house, a key factor in controlling the quality of these essential parts.

Under gennaker the flying experience starts with less than 10 knots of wind. Crew position determines trim. Photo: BirdyFish

Foil design was entrusted to a master of the art, Jean Baptiste Behm. With their J-shape, the foils create maximum lift when fully deployed but remain quite simple to retract. The carbon foils weigh 10kg each and are symmetrical, so can be used on either side of the boat. This simplifies production and after sales service.

Also with simplicity in mind, the position of the foils is fixed, without any adjustment. Rudder rake can be adjusted but to enable good control of the helm the rudder profile is not extreme.

A longer rudder chord means a little more drag but also more tolerance, and less risk of losing control. Sailing at low speeds with a smaller rudder surface area would give no feel to the tiller, making it much more difficult for beginners. The development of the Birdyfish, and refining that balance, took more than two years.

The hull is made of a glass-polyester sandwich, weighs 93kg and has four watertight zones making it unsinkable. The mast is aluminium and, once the foot is unpinned, can be dropped backwards with a crewmember controlling the descent with a halyard in hand.

The maximum speed recorded by a BirdyFish is 22 knots (like a Class 40 but 40 times cheaper!). Photo: MULTImedia/François Tregouet

The BirdyFish is limited to three sails to keep it simple. There’s no trapeze either, the righting moment being entrusted to the foils. This is also a safety choice because, at high speed, any fall could be dangerous. Two crewmembers sit on the gunwale, or move slightly outboard upwind with their feet in the straps.

A major evolution in the development of the BirdyFish means there is also no longer a daggerboard. The first boats sold played their part as pioneers, but it turns out that the foils, although symmetrical, generate more anti-leeway effect than expected. Removal of the daggerboard and its box made the Birdyfish’s cockpit even simpler.

Each foil weighs just 10kg (22lb) and they are symmetrical on port and starboard. Photo: MULTImedia – François Tregouet

Officially, the BirdyFish will fly in upwards of 12 knots of wind. But with a trained crew, the boat can take off from 8 knots. Finding the right angle, producing just the right amount of power at the right time to get the hull out of the water will show the difference between a novice crew and one that already has a few hours of flying experience.

Rusty from decades of cruising on non-foiling boats (and having long forgotten my 420 and Mini years), for me trying the BirdyFish felt like a good test of its genuine accessibility to all. I returned to the shore reassured about my abilities – but more importantly blown away by the extraordinary sensations of flight.

Off the beach at La Rochelle the BirdyFish flew very fast at about 15 knots in a wind oscillating between 10-15 knots. High speed means constant vigilance is essential: the transparent Mylar window in the jib helps with visibility.

There are no more lines at the mast foot than on a classic dinghy: simple. Fittings are attached so as not to compromise watertight zones. Photo: MULTImedia – François Tregouet

As there are no flaps to adjust the boat’s trim it’s the crew’s position that needs to be tweaked. Sitting on the windward side of the boat, well wedged against the shroud, I was quietly enjoying the stability of the boat – its tolerant foils and T-shaped rudder do a remarkable job – when Jean-Baptiste Morin handed over the helm.

I was instructed to use as little helm angle as possible, instead using the mainsheet as an accelerator first, then as a damper. Very quickly, the miracle happened, and we took off! Soon we were flying, perfectly dry just above the chop.

I quickly learned that to remain foiling requires being very sensitive to movement. Rudder correction angles must be as small as possible. There’s no question of moving the whole tiller, instead Jean-Baptiste advised I keep my tiller hand close to my body and only make small movements using just the span of my fingers.

When transporting or storing, the self-regulating J-foils fit inside the cockpit. Photo: MULTImedia – François Tregouet

Course deviations must also be very limited. I estimate that the maximum allowed is more or less 2° around the true wind direction without trimming the sails. The penalty for overdoing it is immediate: the BirdyFish touches down, either softly or more brutally.

Tacking and gybing are not difficult, but it takes a little more experience to complete them in ‘flight’ mode. To demonstrate, Jean-Baptiste retook control of the boat for a series of foiling gybes. Crouching at the front of the cockpit, my role was limited to managing the Solent sheet and above all to hold on, as the rate of turn is brutal, a reminder of the extraordinary performance achieved.

The foil housing is slightly smaller than its well. Foil rake setting is fixed by four bolts: no brain work required. Photo: MULTImedia – François Tregouet

Only twice have I reached 18 knots at the helm of a sailing boat on my first try, and those were on a Gunboat 68 and an 80ft Ultim trimaran – very different budgets to the €18,840 standard BirdyFish.

Three essential options do raise the bill to €21,200 – it’s difficult to do without the jib furler for manoeuvres, a Code 0 with furler offers light airs performance, and a launching trailer is essential for the 135kg (297lb) whole package – but if you want to go foiling for a reasonable budget and with little experience, the BirdyFish rocket hits the target.

BirdyFish specifications

LOA: 4.70m / 15ft 5in Beam: 1.90m / 6ft 3in Draught: 0.90m / 2ft 11in Displacement: 135kg / 297lb Upwind sail area: 13.5m² / 140ft² Downwind sail area: 24.5m² / 258ft²

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Cruising on the Moscow River

About Me in Short

Guide, Driver and Photographer Arthur Lookyanov

My name's Arthur Lookyanov, I'm a private tour guide, personal driver and photographer in Moscow, Russia. I work in my business and run my website Moscow-Driver.com from 2002. Read more about me and my services , check out testimonials of my former business and travel clients from all over the World, hit me up on Twitter or other social websites. I hope that you will like my photos as well.

See you in Moscow!

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Date: May 25, 2013 08:26:00 am EDT
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Tags: Russia , Spring , Moscow Kremlin , Moskva River , Sofiyskaya Embankment , River Tram , River Boat , Moscow River , Moscow

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Pertsov’s House

The fairy-house of engineer Pertsov was built near Cathedral of Christ the Savior in 1907 by the unusual project created by Sergei Malutin in neo-Russian style of architecture. Apartments in this house were built as studios and given for rent for talented artists.

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Moscow Boat Tour

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Description

See all the gems of historical and cultural center of the capital in short time and without traffic jams or tiresome walking.

Depending on the itinerary and duration of the Moscow River boat trip, the tour can be 3 or 5 hours.

Highlights of the tour

St Basil’s Cathedral;
Stalin skyscraper on Kotelnicheskaya (Tinkers) embankment;
The Kremlin;
“House on the Embankment” Stalin skyscraper;
Monument to Peter I;
The Central House of Artists;
Christ the Savior Cathedral;
Gorky Park;
Moscow State University;
Russian Academy of Sciences;
Luzhniki stadium;
Novodevichy Monastery;
Kiev railway station;
Europe Square;
Moscow City Hall;
Government House;
Expocentre Exhibition Complex;
and other famous sights.

You will learn about the different epochs of the city from the foundation in 1147 till Soviet times of 20 th century.

Moscow River

Moskva river has the form of a snake and is the main waterway of Moscow, consisting of a cascade of reservoirs. Within the city, Moskva river is 80 km long, 120 m - 200 m wide and up to 14 m deep. The narrowest part of the river is the Kremlin area in the city center, and the most extensive is around the Luzhniki Stadium in the south.

Bridges in Moscow

Undoubtedly, bridges and embankments are among the most scenic spots and main attractions of Moscow. Plus, they are so romantic.

Bolshoy Kamenny Bridge – Great Stone Bridge – is the main bridge of Moscow . The first stone bridge was constructed here in the 17th century.
Patriarshy Bridge is one of the youngest pedestrian bridges, built in 2004. The bridge connects the iconic Christ the Saviour Cathedral with funky Bersenevskaya embankment, extremely popular place among locals for its trendy art galleries, cafes and panoramic views. Patriarshy Bridge used to be a shooting location for ex-Russian President Dmitry Medvedev's New Year speech to the nation.
Borodinsky Bridge, erected in honor of the 100th anniversary of the glorious victory in the Battle of Borodino (which every Russian kid knows about), a fierce legendary battle during the Russo-French war of 1812.
Bagration Bridge one of the pedestrian bridges with most picturesque views of the Moskva River with its numerous upper-level observation platforms. The bridge was erected to celebrate the 850th anniversary of Moscow city in 1997.
Krymsky Bridge used to be in Top 5 Europe’s longest bridges some 100 years ago. The bridge got its name after the ancient Krymsky ford which Crimean Tartars used to invade Moscow in the 16 th century.

Embankments of Moscow

Moscow river boats 37 embankments, the most popular being Kremlevskaya, Sofiyskaya, Pushkinskaya, Vorobyovskaya and Kolomenskaya.

You can get the most spectacular views of the Kremlin from Kremlevskaya and Sofiyskaya embankments.

Pushkinkaya embankment is the most romantic in Moscow. It meanders along Gorky Park and Neskuchnyi garden and is rich for all kinds of entertainment as well as cozy nooks, including Olivkovy beach, the famous Zeleny theater as well as a pier for river cruisers.
Vorobyevskaya embankment is part of Sparrow Hills nature reserve. This place opens a beautiful panorama of the river and city from the observation deck and is considered to be the place for taking serious decisions in life.
Embankment in Kolomenskoye Museum-Reserve has a special charm due to its peculiar geographical relief. The boat trip around Kolomenskoye would be the most peaceful in your life.
Taras Shevchenko embankment is popular among photographers for its modern Moscow City skyscrapers. Highly recommended for your night boat trip.
Embankments of Moscow are the pride of the capital. A distinctive feature of each of the promenades is its architecture and beautiful views. In addition, almost all the embankments of Moscow have a rich history and a lot of notable buildings.

Different epochs

Taking a walk along the Moskva River by boat, you will witness the architecture of Moscow from different eras and styles. Archaeological studies indicate that already in the XI century there stood a fortified settlement on Borovitsky hill, which is now called the Kremlin. Little fortress could not accommodate all the residents of the rapidly growing city, and the Grand Duke ordered the construction of a new Kremlin, larger than the former.

Boat trip around Kolomenskoe Park

Moscow river boat trip starts from the pier Klenovy (Maple) Boulevard and provides reat views of Nicholas Perervinsky monastery.

Nicholas Perervinsky monastery was founded at the time of the Battle of Kulikov (1380). The monastery, got its name from the surrounding area – “Pererva”, which can be translated like “tear off” and because of the location – here it abruptly changed its course, turning to Kolomna, standing on the opposite bank.

Nowadays Kolomenskoye is State Art, Historical, Architectural and Natural Landscape Museum-Reserve, which doors are open to everyone who wants to get in touch with the ancient history of Russia.

Take a break from the big city hustle in the shady parks and gardens of the Kolomenskoe Museum-Reserve. Don’t miss a wonderful Church of the Ascension and Tsar Alexey’s Palace in Kolomenskoye!

Monasteries and temples

Novospassky Monastery
Founded in the 13th century on the site where now is located the Danilovsky monastery. After a few decades, in 1330, Ivan Kalita moved the monastery onto the Borovitskii hill of the Kremlin. However, in the 15th century, Spassky Monastery again moved, this time to a more spacious place on Krasnoholmskaya waterfront.
Church of St. Nicholas in Zayaitskom
Erected in the middle of the XVIII century in baroque style. The building survived after the 1812 fire, but the utensils were destoyed. Parishioners collected donations and restored the temple on their own. In Soviet times, it was closed and re-opened only in 1992.
Cathedral of Christ the Savior
The church was originally erected in honor of the victory over Napoleon and was being under construction for long 44 years. Notoriously demolished in 1937 to be a giant swimming pool under open sky. The current building was constructed in 1990s. It is the tallest and one of the largest Orthodox churches in the world.
The temple was built in 1679-82, during the reign of Tsar Fedor Alekseevich, in late Muscovite Baroque style and can be characterized as bonfire temple. Each gable is a symbol of a heavenly fire.
Novodevichy Convent
The most famous concent and monastery in Moscow, presumably founded in 1524. Novodevichy’s status has always been high among other monasteries, it was in this monastery where the women of the royal blood, the wives of Tsars and local rulers of Moscow were kept in prison as nuns.
St. Andrew’s church (male acts as Compound Patriarch of Moscow)
St. Andrew’s church stands right on the slopes of the Sparrow Hills, on the way down to the Moskva River, on the territory of the Nature Reserve “Sparrow Hills”. The monastery is small in size but is very cozy. It’s situated in a quiet courtyard surrounded by temples, fruit trees and flowers.

What you get:

+ A friend in Moscow.
+ Private & customized Moscow river cruise.
+ An exciting pastime, not just boring history lessons.
+ An authentic experience of local life.
+ Flexibility: changes can be made at any time to suit individual preferences.
+ Amazing deals for breakfast, lunch, and dinner in the very best cafes & restaurants. Discounts on weekdays (Mon-Fri).
+ A photo session amongst spectacular Moscow scenery that can be treasured for a lifetime.
+ Good value for souvenirs, taxis, and hotels.
+ Expert advice on what to do, where to go, and how to make the most of your time in Moscow.

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12 foiling boats for sailors of all levels

THE PERFECT GIFT!

Birdyfish – 4,7 m – For foiling beginners

Flo1 – 4.25 m

NACRA F20 – 6,20 m – Like America’s Cup cats

Foiling Dinghy – 3,86 m – Small and versatile

Moth – 3,35 m – The foiling cult dinghy

Peacoq 14 – 4.70 m – Like a flying Fireball

Persico 69F – 6,9 m – The trendy boat

Skeeta – 3,35 m – Easy for anyone

Stunt S9 – 4,16 m – The Italian Foiling cat

Ufo – 3,00 m – Flying with two hulls

Waszp – 3,35 m – For the whole family

Whisper – 5,40 m – Full performance

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