Classic Moth Boat Association

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moth class sailboat for sale

Harry Cates-built Florida design Classic Moth Boat, Nr 2496

moth class sailboat for sale

Sun Fun Sailor built from plans in Science & Mechanics Oct 1962

Hi, I wish to advertise and sell my Moth built by my brother in the 1960’s   For Sale : Sun Fun Sailor built from plans in Science & Mechanics Oct 1962.   Includes trailer and 2 sails. Wood construction hull, mast and boom. Hull bottom was fiberglassed when built in the 1960’s.   Located in Appleton Wisconsin.   Asking $900.00.      Contact Ron Aavang @  This email address is being protected from spambots. You need JavaScript enabled to view it. document.getElementById('cloak8a8ada4a72ea9e3c3de80c28e64a447e').innerHTML = ''; var prefix = 'ma' + 'il' + 'to'; var path = 'hr' + 'ef' + '='; var addy8a8ada4a72ea9e3c3de80c28e64a447e = 'raavang' + '@'; addy8a8ada4a72ea9e3c3de80c28e64a447e = addy8a8ada4a72ea9e3c3de80c28e64a447e + 'new' + '.' + 'rr' + '.' + 'com'; var addy_text8a8ada4a72ea9e3c3de80c28e64a447e = 'raavang' + '@' + 'new' + '.' + 'rr' + '.' + 'com';document.getElementById('cloak8a8ada4a72ea9e3c3de80c28e64a447e').innerHTML += ' '+addy_text8a8ada4a72ea9e3c3de80c28e64a447e+' ';  or call cell # (920)904-2167.

moth class sailboat for sale

early Ventnor

This is an early Ventnor with an unknown registration number. 

moth class sailboat for sale

Europe Dinghy in FL

Europe dinghy with

carbon fiber mast, aluminum Proctor boom,

wood dagger board, fiberglass rudder,

Cunningham, vang.

2 sails - practice sail and North racing sail.

Asking $1500.

moth class sailboat for sale

Jean Gruhler's Ventnor -- Ventnor Moth # 661, Maine

For sale: Ventnor Moth # 661, built by Ventnor Boat Works in West Atlantic City NJ in 1944.

The boat was rebuilt (restored) by Jean A Gruhler in both 1967 and 1991, found its way to Maine in 2014.

She would like to sail and race again, but we do not have the time.

It has a new paint job, by a professional boat builder.

Sails, spars, both rudders all in very good condition.

Has a cradle

Sale price $1,100.

moth class sailboat for sale

Member Links

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Upcoming Events

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Welcome to the US Moth Class Association

North americans.

The 2023 Moth North American Championship was held September 14-17 at Sail Newport, RI. Check out one of the highlight videos from the event below and if youre hungry for more, go to Nick Bower's Youtube Channel

The 2024 Moth NAs will be in Southern California in the Fall. Dates and venue TBD

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Regional Events

 west coast events 2024.

New Years Day Race:  Jan 1, SDYC, San Diego

Winter Series #1: Jan 13-14, MBYC, San Diego

Winter Series #2: Feb 17-18, South Bay, San Diego

Moth PCCs:  Mar 23-24, CYC, San Diego

Long Beach Training Week:  April 7-12, ABYC, Long Beach

Long Beach Spring Classic: April 13-14, ABYC, Long Beach

Ted Rogers Bay Area Championship: May 25-26, RYC, SF Bay Area 

High Sierra Regatta:  Jul 13-14, Huntington Lake

East Coast Events 2024

Summer Regattas in Newport RI, TBD

US Moth Class Newsletter

We send out a handful of US Moth Class newsletters per year to keep class members up to date on events and logistics. Below you can find the 10 most recent newsletters. To subscribe, open one of the links below and click the "subscribe" button on the top left corner of the page

Getting Into the Moth Class

Moth class usa facebook group.

Joining the US Moth Class's Facebook group is the best way to see what's going on and get involved with the class. Stay up to date with regattas, boat building projects, and general moth froth!

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Used Boats For Sale

For many people looking to get into moth sailing, a well setup used boat is the best place to start. Check out the Moth Buy & Sell Facebook marketplace to get a feel for what boats are in your price range and feel free to reach out using to the contact us tool at the bottom of this page if you have questions about what to look for when buying a used boat. Keep in mind that international shipping is easy to arrange using out freight partner!

Shipping/Freight Logistics

One of the coolest aspects of the Moth is the fact it can be disassembled and packed into an 11 foot long box for easy shipping! If you're looking to send your boat to a regatta or buy a used boat and need it delivered, shipping is simple thanks to our freight partner, Saturn Freight Systems. They handle everything from regional ground freight to international air freight. Use the contact us tool at the bottom of the page to get put in contact with a Saturn Freight representative.

Interested in learning more about the US Moth Class? Feel free to reach out!

Thanks for submitting!

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MACH2 Moth

MACH2 Essentials

All you need to know about the Moth class and Mach2 in particular. All the essential information regarding the boat, it's history, evolution of foiling, the designer, the sailmaker and the boat builder. There's even an introductory video and a few testimonials. Enjoy!

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The Designer

Andrew 'AMAC' McDougall first became involved with the Moth class when he built his first Moth at the age of 15 in 1970.

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Need some parts for your Mach2? We have a full compliment of sails, spas, foils and Mach2 spares available online.

Speed Demons

36.6 ned goss.

Is this a world record speed for a dinghy? Ned Goss in a 18-25 knot Charleston sea breeze hit a peak speed of 36.5 knots, with a 10 sec average of 35.9 knots in his MACH2. Goss’s Velocitek files were verified by Bora Gulari & Velocitek founder Alec Stewart. Take that!

30.2 Josh McKnight

Following his win at Lake Garda, 2012 World Moth Champion, Josh McKnight then set an outstanding top speed and ten second average on his Mach2. It goes to show the Mach2 / KA Sail is a killer combination!

31.5 Scott Babbage

Scott Babbage set this speed sailing his MACH2 on Sydney Harbour whilst training with Josh McKnight. Any top speed that's above 30 knots is well worth a mention, but to have a ten second average that is also above 30 knots, wow!

31.4 Hiroki Goto

Sailing at a lake in Japan near Mount Fuji, Hiroki Goto, set a very impressive top speed of 31.0 knots, only to surpassed his on record the following day with a top speed of 31.4 knots and a ten second average of 28.4 knots.

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MACH2.6 Is Here

This is the fifth major upgrade in the illustrious life of the Mach2 Moth. Already it's proving to be dominant. For the complete list of upgrades and features, hit the link below

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Testimonials

We take a great deal of pleasure designing, building and supporting the best foiling Moth in the world. And nothing gives us greater pleasure than the positive feedback we have received from MACH2 owners over the past 10 years. Here's a few owner testimonials........

Thanks for Visiting the MACH 2 Website

Before you go, sign up to keep up to date with all the latest MACH2 developments.

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It is not easy to find your first moth. The best way is to get in contact with your local moth sailors. Basically you get what you pay for. There are a lot of second hand boats on the market but there is also a growing numbers of moth builders.

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Bladerider Moth Sailboat

  • By Alan Block
  • Updated: August 21, 2007

moth class sailboat for sale

Even the staunchest keelboat devotee can’t help but be intrigued by them. They don’t have a trapeze, and they’ve only got one little sail, yet they sail at twice the true wind speed. They’re monohulls, but they move faster than a Tornado cat, sailing upwind as fast as 13 knots, downwind close to 30 knots. Jumping out of the water on ultra-light carbon foils in a 5-knot breeze, they’ll smoke almost anything else powered by sails.

They’re International Moths, and if Andrew “Amac” McDougall of Bladerider International has his way, they just may change the world of singlehanded dinghy sailing forever.

Ironically, the Moth class that has spawned the most groundbreaking development in hydrofoil technology is one of the ancient ones. Len Morris built his 11-foot Olive near Melbourne, Australia, in 1928. A year later, Joel Van Sant built a Moth in Elizabeth, New Jersey, to almost the same proportions. In both locations the small catboats were a hit, and numbers grew steadily due to the low cost of building such small, simple dinghies.

The class spread from the U.S. to Europe and from Australia to New Zealand, with huge design variations from fleet to fleet. Various national classes modified their rules slightly to encourage international competition, and with the International Yacht Racing Union’s acceptance of the class in 1972, the International Moth Class was born. The openness of the Class Rule, the first sentence of which reads, “the intention of these class rules is to give the designer and builder the fullest liberty in design and construction,” has resulted in much innovation and a variety of designs, including skiff Moths, pram Moths, scow Moths, skinny tube Moths, dinghy Moths, and now foiling Moths (which can be skiff Moths or scow Moths).

In 1999, Australian Dr. Ian Ward opened a can of worms that would change the class more profoundly than any prior development. Ward fitted horizontal hydrofoils to the bottom of the centerboard and rudder of a Moth and he found that the foils lifted the boat out of the water with ease. Catamaran and trimarans had already proven that three T-shaped foils worked, but conventional wisdom held that a dinghy with two foils would be far too unstable to be sailable. Ward quickly found out that the conventional wisdom was wrong, but devising a system to maintain ride height and control would take more time. Brothers John and Garth Ilett created and refined such a system in 2000 using a surface-sending wand to control the main foil’s lift.

Amidst intense intra-class squabbling, Rohan Veal used the Iletts’ creation to win the 2004 Moth World Championship with eight firsts in eight races. In one race, he beat the second place boat by ten minutes. With non-foiling, or “low riding,” Moths quickly approaching obsolescence, the biggest obstacle to competitive Moth sailors became obtaining their own foiling moths. The Iletts’ Fastacraft and a handful of other small, custom boatbuilders just couldn’t keep up with demand for their carefully constructed, all-carbon dinghies. That’s where McDougall came in.

A longtime Moth sailor, McDougall built his first Moth more than three decades ago. In early 2005, he purchases one of the Iletts’ foiling Moths and immediately knew that it was something special, a sailing experience that shouldn’t be constrained by the limited resources of a few custom builders. McDougall scraped up the money for his own Moth design/build business and set to work improving and simplifying existing designs and components to allow faster fabrication and shorter build times. He spent four months on the design of the foils, performing flow analysis and even writing his own foil-creating software. Once he completed the basic boat design, McDougall recruited Veal to help develop and market the boats, signed a partnership with composite specialist McConaghy Boats, and Bladerider International was born.

There are a handful of foiling Moths in the U.S., but the first two production Bladeriders landed here in April via air freight in boxes weighing about 100 pounds. Detroit sailor Bora Gulari bought the second U.S. boat, and in June he took me out for three days of “flight school.” I came late to sailing and started in big keelboats, so I lack the balance and quick reaction time with which lifelong dinghy sailors are blessed. I weigh around 220 pounds, a third bigger than most competitive Mothies, so in a way, I’m the ideal person to test the Bladerider. McDougall’s vision is not to create one more International Moth, it’s to bring the foiling experience beyond the aerospace engineers and tinkerer/athletes to the average sailor–someone just like me. Twenty minutes on the Bladerider taught me that I’ll never win a Moth World Championship, but I experienced a sensation totally new to me, something that could revolutionize the small boat world.

On the first day, moderate winds on a flat Lake St. Clair provided plenty of power, as Gulari proved less than 20 yards from the entrance to Bayview YC when he launched onto the foils and accelerated to 12 knots, upwind. When he turned down to a reach, our Sea Ray could hardly keep up. After a few minutes, I jumped into the water to take my turn. The first thing that struck me was the boom, in the head. The next was the incredible narrowness of the tiny hull. Dwarfed by large, trampoline-covered carbon wings, the 12-inch wide hull resembles a slab-sided torpedo. The designer realized that the hull would spend most of its time in the air, so he downsized it accordingly. The hull is covered with the most aggressive non-skid I’ve ever encountered, and as tippy as the boat is, that’s a good thing. The racks are works of art: clear-coated carbon sculptures covered with Dacron tramps, their width provides massive righting moment to counter the power from the big, windsurfer-inspired sail that sleeves over a thin-walled carbon mast.

Once I got moving, the instability vanished, even before I lifted free of the water. The foils generate substantial lift and stability at slow speeds, giving the pencil-thin hull the feel of a wide boat. Simple sail controls allowed me to concentrate on placing my body where Gulari told me, although the oversized mainsheet made easing the sail a bit stickier than it should have been. It’s a physical boat that requires lots of balance, and the small loads and efficient controls should be attractive to female and youth sailors.

A puff hit, and I practiced the dinghy mantra, “ease, hike, trim.” Hiking on the wing, I trimmed the sail and lifted almost imperceptibly out of the water. Another puff lifted me completely clear, and things went strangely silent. As a Melges 24 sailor, I’m used to going fast, but that speed is always accompanied by spray, vibration, and the sounds of crashing through waves. Speed on a Moth is completely different–drama free, peaceful, almost trance-inducing. Reality broke into my reverie when I let the boat heel too far to leeward. The boat crashed back into the water, and I hit the shrouds.

For days afterwards, my bruises would remind me of just how fast I’d been going.My test sail was like nothing I’d ever experienced on the water. In twenty minutes, the Bladerider opened my eyes to the possibilities of foilborne sailing. Foils have already invigorated the International Moth Class, with membership growth at a ten-year high, but it’s not just the IMCA that Bladerider is trying to revolutionize. McDougall’s operation currently builds three to four boats per week, but to goal is to double that output.

Priced at $14,000, the Bladerider isn’t cheap, but it provides an utterly new experience. Gliding above the water at double digit speeds, the only sound a faint hiss from the foils, you’ll be transformed. Going back to your loud, sloppy, slow, surface-bound craft might just be unthinkable.

For more about the Bladerider Moth, go to www.bladerider.com.au/

  • More: foiling , McConaghy , moth , Sailboats
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moth class sailboat for sale

2024 Boat of the Year Best Recreational Racer: Z24

Beneteau 36.7 on Lake Michigan

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moth class sailboat for sale

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Waszp – the new one-design foiling Moth that could make learning to fly a little less painful

Matthew Sheahan

  • Matthew Sheahan
  • September 14, 2016

As a development class, the International Moth has been a hotbed of foiling innovations over the past few years. Matthew Sheahan reports on a new accessible one-design version

Waszp on display at Foiling Week 2016, Malcesine, Lake Garda. Pic: Gilles Martin-Raget

Waszp on display at Foiling Week 2016, Malcesine, Lake Garda. Pic: Gilles Martin-Raget

If there is one class of boat that has turned more heads around the world in the last decade than any other, it must surely be the foiling Moth. Having started as more of a stunt than anything more serious, there is now no other way to race a Moth.

Fleets worldwide have grown and the experts make foiling look effortless, yet the reality is that mastering the Moth is even more difficult than carve gybing a windsurfer. Yet there is no doubt that the combination of speed, silence and extraordinary looks has been, and continues to be, a big draw.

With so few rules, the International Moth – as opposed to the ironing board-shaped British Moth – has always been at the leading edge of design and development. Famous for its laissez-faire approach, it has just a few simple rules that have resulted in some of the most radical thinking in the sport.

But not everyone is able or willing to play. For some, the pace of development got too hot when hull shapes became little more than a plank on edge. A boat that would only float the right way up if you were moving and required the balance of a cat on a fence from the helmsman was a challenge too far for many sailors.

But as we now know, there was another big hike in performance to come as the Moth took to foils. Once again, some found this a step too far, though plenty rose to the challenge and helped to create a completely new style of racing. Those who have learned to foil have left the rest of us green with envy.

One design Moth

But a new design of Moth might change all that as the long-awaited WASZP goes on sale. Conceived five years ago by Andrew McDougall, designer of the MACH2 Moth, the idea was to make a foiling Moth not only cheaper, but easier to sail.

So while the WASZP is based on the foiling Moth and conforms to the few class rules that there are, it differs fundamentally in that it is a strict one-design. But it has other advantages for the less daring.

The stern has greater volume to prevent sinking during low-speed manoeuvres and tacking. This also helps keep the boat on the foils. Pic: Gilles Martin-Raget

The stern has greater volume to prevent sinking during low-speed manoeuvres and tacking. This also helps keep the boat on the foils. Pic: Gilles Martin-Raget

For starters, the wings provide sufficient buoyancy to keep the boat the right way up when stopped, and they are also adjustable to allow you to alter the angle by which they rise towards their tips – technically called dihedral.

Setting the wings flatter, that is with less dihedral, is like lowering the stabilisers on a child’s bike. The outboard ends of the wings touch the water and support you before things go pear-shaped.

Looking like a pro

As you get more proficient at keeping the kind of balance that unicyclists take for granted, you increase the dihedral to allow you to sail the boat heeled to windward.

At this point the daggerboard T-foil is hauling you to windward while you look like a pro.

Furthermore, the mast is unstayed, making it simpler to rig and, with no shrouds to act as giant cheese wires, considerably safer when you do take a tumble. The main foil and rudder lift like conventional daggerboards so it’s easier to get on and off the beach.

Fully fledged Moths have a fixed daggerboard and rudder, which are fitted when the boat is on its side, leaving you to swim out into deeper water with the boat in tow like a dog with a stick before you can right it and sail away. The reverse process is required when coming ashore.

Clearly, this is not for everyone. With delicate, expensive carbon foils, you want to get this right from the start. Few do.

The WASZP, however, has foils that can not only be lowered progressively once you’re under way, like a Laser, but are made of alloy with injection-moulded tips, making them far more robust.

A conventional daggerboard and matching T foil rudder make life easier getting afloat and back ashore. Pic Gilles Martin-Raget

A conventional daggerboard and matching T foil rudder make life easier getting afloat and back ashore. Pic Gilles Martin-Raget

Worth the wait

The hull is an epoxy, glass, carbon-infused composite so it is tough, but light, weighing 48kg including foils. And although that’s around 18kg heavier than a modern Moth, the WASZP is the same weight as the RS Aero, which I know from experience is light enough to carry down to the water.

And then there’s the cost. At around US$10,000 (£7,550) it is said to be half the price of a fully tricked MACH2.

The project has been a long time coming, but now it’s here with a fleet racing at the recent Foiling Week held on Lake Garda there’s a buzz going around that it was well worth the wait.

Design features

One of the keys to the WASZP is the folding wings. Set horizontally, they act as stabilisers and can be raised as you become more proficient, using different-sized wing supports. Pic Gilles Martin-Raget

One of the keys to the WASZP is the folding wings. Set horizontally, they act as stabilisers and can be raised as you become more proficient, using different-sized wing supports. Pic Gilles Martin-Raget

Different sail plans for different sizes and abilities of sailor have become popular in modern single-handed dinghies. The WASZP has a choice of 5.8 sq m, 6.9sq m or 8.2sq m sails. Photo Gilles Martin-Raget

Different sail plans for different sizes and abilities of sailor have become popular in modern single-handed dinghies. The WASZP has a choice of 5.8 sq m, 6.9sq m or 8.2sq m sails. Photo Gilles Martin-Raget

A wishbone boom system, like that on a windsurfer, dispenses with a conventional boom and kicker and makes tacking easier. Pic Gilles Martin-Raget

A wishbone boom system, like that on a windsurfer, dispenses with a conventional boom and kicker and makes tacking easier. Pic Gilles Martin-Raget

As with the Moth, the WASZP uses a wand to control the ride height automatically using a mechanical sensor system. Pic Gilles Martin-Raget

As with the Moth, the WASZP uses a wand to control the ride height automatically using a mechanical sensor system. Pic Gilles Martin-Raget

With its unstayed mast it is easy to rig, there’s no rigging to collide with when you take a tumble and it’s easier to get back aboard after a capsize. Pic Gilles Martin-Raget

With its unstayed mast it is easy to rig, there’s no rigging to collide with when you take a tumble and it’s easier to get back aboard after a capsize. Pic Gilles Martin-Raget

Extruded alloy sections and the mechanical hinge systems make for a simpler and more robust system than the composite foils in a Moth. They are also cheaper to replace. Pic Gilles Martin-Raget

Extruded alloy sections and the mechanical hinge systems make for a simpler and more robust system than the composite foils in a Moth. They are also cheaper to replace. Pic Gilles Martin-Raget

A concave profile bow allows better response in waves for the wand while providing greater volume forward to help prevent burying the bow during a bear away. Pic Gilles Martin-Raget

A concave profile bow allows better response in waves for the wand while providing greater volume forward to help prevent burying the bow during a bear away. Pic Gilles Martin-Raget

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  • Sailboat Guide

Moth (International)

Moth (International) is a 10 ′ 11 ″ / 3.4 m monohull sailboat designed by Open starting in 1928.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

  • SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

  • D: Displacement of the boat in pounds
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Single handed development class that has always been at the cutting edge of performance racing dinghies. The MOTH, raced today (2015), at the top tier of competition is a ‘foiler’ with wings.

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Damic Design

Swift Hydrofoils

Damic Design specialises in design and manufacturing of Moths and Hydrofoils for the International Moth Class. While Moth sailing is our passion, our main objective is to offer the fastest, most developed and best built boats and foils on the market.

Our involvement in the class started in 2004, exposing us to the world of Moth hydrofoiling technology since the early days. The initial period was quite experimental, but also fun and educational as it allowed us to learn and develop our design ideas. We made a lot of foils in this phase with the most successful being the Macita that won the 2013 World Championship. While this foil is not on offer anymore, it certainly paved the way for the foils we make today.

In particular, the Swift range which consists of a number of sizes, each with different lift and control characteristics designed to ensure optimal performance over a wide range of sailing conditions. This range has now grown to include: Two rudders hydrofoils (Small and Medium), three mainfoils (Super Small, Small and Large) and our super thin HM carbon verticals.

The Swift Hydrofoil range is a refined product line with the foils now in their 3rd generation of improvements. We are constantly looking to make gains that we first test, and then bring into production.

What this means for you is that every product in the range is on trend and offers performance improvements for your boat without the need to upgrade the entire platform. While this range is sold with our Swift Moths, it is also available to Bieker, Exocet and Mach 2 owners that are looking for a fast upgrade option. Our foils placed 7 out of the top 10 at Perth Worlds, won 2023 NSW and Australian Nationals and also got 2nd in the Waymouth Pre-Worlds regatta. Furthermore, all Damic Design foils are made in Australia and are constructed from solid carbon fibre, from market leading supplier, Toray. While this increases production costs we believe it is warranted as it insures superior quality and perfomance on what we consider as the most important part of the boat. We are also proud to be the only foil manufacturer that is solely focused on foil development and directly involved in design, testing and manufacturing of all of our products. That means that every foil that leaves our workshop has been hand finished by the designer and Moth sailor that truly understands the product and what is required to make it go fast!

Swift Mainfoils

moth class sailboat for sale

Swift Super Small (v2)

Our latest hydrofoil, specifically designed for light sailors or as a strong wind foil. It features an innovative tip and bulb design that are optimised for reducing drag when going fast.

$3,350 AUD + GST

moth class sailboat for sale

Swift Small (v3)

The ultimate all round medium wind foil, that has been winning regattas since the initial release. It is known for having great control features with a very wide performance window.

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Swift Large (v2)

Excellent high lift foil that can be carried up range thanks to its thin section and very efficient profile. This foil is a proven race winner and a must for heavy sailors or light wind venues.

Swift Rudderfoils

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Swift Small Rudder (v1)

The Small rudder is based on the same theory as our Medium. It is a high aspect low drag shape designed to minimise drag and maximise lift offering great glide though ability for ease of foil tacking. Unlike other small rudders, ours still makes foil tacking a breeze while being tiny in size and super fast.

$2,200 AUD + GST

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Swift Medium Rudder (v3)

Our Medium rudder is a well proven design that is a result of many years of development. Its short cord makes it very low drag however it generates plenty of lift thanks to its high aspect ratio. This foil will help make your foiling tacks easy and repeatable. $2,200 AUD + GST

Swift Verticals

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Swift HM Rudder Vertical (v3)

The v3 is our latest design to date. It further improves on the original v1/v2 designs with changes in the bottom 1/4 of the section. It is designed to be on the absolute limit of the materials to insure the ultimate performance from reduction in drag coefficient. It also includes a number of design features that combat the “all too common” rudder wash out problems. Made from pre/preg solid High Modulus carbon fibre construction, it is thermally stable and ultra stiff.

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Swift HM Main Vertical (v1)

This is the thinnest main vertical on the market which offers significant reduction in drag by simply being smaller to reducing skin friction and displacement. Made from solid High Modulus carbon fibre construction, it is thermally stable and ultra stiff. Includes pushrod and bellcrank kit.

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AOA Templates

These angle of attack measuring templates, are designed to fit our range of Swift main and rudder hydrofoils. With the help of this device, you will be able to determine the all important foil angle relative to waterline. $45 AUD + GST

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Swift Vertical Covers

Tailor made to suit Swift HM Main verticals and HM Rudder Verticals. These premium quality covers are Australian made using quality Dimension Polyant sailcloth. They features marine canvas outer skin and felt lining inside. $120 AUD + GST

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Swift Horizontal Covers

Suitable for Swift Super Small, Small and Large horizontal hydrofoils. These premium quality covers are Australian made using quality Dimension Polyant sailcloth. They features marine canvas outer skin, felt lining inside and Velcro closure to protect the trailing edges. $110 AUD + GST

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Discussion in ' Boat Design ' started by Panos_na , Dec 8, 2005 .

Panos_na

Panos_na Junior Member

I am a Student of Naval Architecture and I am doing a last year project for my University. The subject is about the design of a hydrofoil sailboat. I deciced to design a Moth boat. Because my project will be focused mostly in the hydrofoil design and appplication and not in the hull design, I need some plans of a Moth boat. Can anyone help me? I need the lines plans, body plan, etc, plus the exact Center of gravity of the hull. Please if anyone can help me, let me know. Thank you!  

Stephen Ditmore

Stephen Ditmore Senior Member

Go to www.foils.org The last item under "site map" is a paper by Ian Ward. That's your starting point. The Italian Moth Class page is www.moth.it They have an article on the subject posted at www.moth.it/Magazine_dinghy.htm The pioneering designer and most successful builder of hydrofoil Moths is John Ilett at www.fastacraft.com I don't know if he sells plans (or would provide you with them free if you were to offer to do research for him and sign a nondisclosure). A thread in this forum with many participants who might be able to help you is www.boatdesign.net/forums/showthread.php?t=2447 I've started what I hope will be a related thread at www.boatdesign.net/forums/showthread.php?t=9695  

casavecchia

casavecchia Senior Member

http://www.intmoth.com/info/lines.php  

thesom

thesom Junior Member

sti zitiania gia sxedia vgikame???? zita apo to mavraki  
This is a moth boat that I designed myself. What do you think?  

Attached Files:

Moth_perspective.jpg, moth_side.jpg.

zerogara

zerogara build it and sail it

Moth foils I would suspect that you will find some plans for a Moth on the net and most specifications. I would also speculate that the design itself is not of outmost importance but the specification of weight/drag at various stages. What you are asking about the CG is a little peculiar though! You are talking about a boat that on the average weighs as much or less than its crew, which is able to move around and effectively change the cg from one possible extreme to the other. For being of scientific importance it must be something new and innovative. Would redesigning something that exists and possibly improve its efficiency be sufficient? Kozmas  
I don't want to design something new and innovative. What I want is to find a method for a Hydrofoil boat design. For example, I want to find out the steps that a designer must follow, in order to design a hydrofoil boat. One thing that the designer must know, is the Center of Gravity of the boat itself,excluding the crew. That's why I want someone to give me some information about tha CG of amoth boat.  
Moving one's weight fore & aft as required is a part of dinghy sailing, so there's no reason to assume that the LCG is static. Having said that, my assumption would be 8/15 of the waterline length (53.33% from the bow) initially, with the sailor shifting aft at takeoff to bring the total LCG to about 60% of waterline. I'm pretty confident my first number is on target for displacement speeds. There are people who may be more expert than I on the second part.  
What if you were to make an assumption of the range that the CG of a Moth may be ranging between 52%-62% let's say, and use it as a variable of the model? Even within a single design you may have variations of the CG disregarding crew position. Mast rake for example which in a Moth is a significant part of its total weight (complete rig with sail up). Boom position, etc. You can excuse yourself with a guestimate based on these (at least as far as academics go). Also in aircraft design models the CG with the foil plains are pretty close, while on the moth the CG in reference to the plain of the foils that produce lift is a triangle. Any kind of fore/aft rocking shifts the CG from the foil center point axis by a large percentage. Imagine the heights of 2 triangles the one with a 60' top angle the other with 170' I hope to have thrown some ideas in there that may help you. Keep us posted!  
In order to find the CG including the crew weight, you must already know the CG of the boat itself. But it is difficult to find the CG of the boat itself, without having the boat already constructed.  
Do you? Why not just decide where you WANT the total CG to be and figure the person sailing the boat will position herself (another wishful thought) accordingly?  

wet feet

wet feet Senior Member

I don't know how familiar you gentlemen are with Moths.This being the case,I hope nobody will be offended if I point out that the hulls often weigh less that 10Kg,sometimes much less.Compared to the weight of the acrobat driving the beast and the other forces acting on it,the CG of the hull could probably be ignored.  
wet feet said: I don't know how familiar you gentlemen are with Moths.This being the case,I hope nobody will be offended if I point out that the hulls often weigh less that 10Kg,sometimes much less.Compared to the weight of the acrobat driving the beast and the other forces acting on it,the CG of the hull could probably be ignored. Click to expand...

Robjl

Robjl Senior Member

Cg Panos, I find it hard to believe that a student in their final year of Naval Architecture can't calculate the CG from basics? What have you learnt? It is a simple arithmetic exercise, (usually on a spreadsheet) and has been described on other threads. However you seem to be stuck... I would estimate the CG to be about 5% aft of the centre for the hull only then add rig etc. Have you tried using the search facility in this forum to research centre gravity? But as others have said ... It's not going to make much difference due to the weight of the crew. Cheers.  
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Robjl said: Panos, I find it hard to believe that a student in their final year of Naval Architecture can't calculate the CG from basics? What have you learnt? It is a simple arithmetic exercise, (usually on a spreadsheet) and has been described on other threads. However you seem to be stuck... I would estimate the CG to be about 5% aft of the centre for the hull only then add rig etc. Have you tried using the search facility in this forum to research centre gravity? But as others have said ... It's not going to make much difference due to the weight of the crew. Cheers. Click to expand...

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Moth Europe presentation

Moth europe, the most elegant solo dinghy .

The Moth Europe is a gauge where only the length, width and sail area are limited. This boat is ideal for girls and light boys after the Optimist, but is also suitable for heavier racers (up to 80 kg). Numerous fine adjustments allow you to control its power when the wind increases. Lively and very lively at the helm, it is a pleasant and responsive boat.

The Moth was the women's single-handed Olympic dinghy at the end of the 1990s before being replaced by the Laser Radial.

Moth Europe, second hand ads

Used Moths are relatively cheap. Or even really cheap. You can find used boats from 1000€ for boats that are a little bit old but still very performing.

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Used Moth Europe price table

Advert titleBuilderYear Price

Winner Boats2005 5000€

-2000 300€

-1975 280€

-2000 320€

-2000 800€

-1978 2000€

Winner Boats1988 2200€

Winner Boats2000 800€

2Win2000 1500€

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-2000 500€

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Lanaverre1970 300€

Galeon 1200€

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