sunwind 20 sailboat

Review of Sunwind 20

Basic specs..

An outboard motor is often used on this boat. In that case the boat will typically require a power of 3 - 4 hp, alternatively 73 - 87 lbs thrust if you prefer an electrical motor. Electric outboards are becoming popular for sailboat owners who want clean instant power with less noise and no exhaust fumes.

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Capsize Screening Formula (CSF)?

The capsize screening value for Sunwind 20 is 2.09, indicating that this boat would not be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 5.4 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Sunwind 20 is about 82 kg/cm, alternatively 459 lbs/inch. Meaning: if you load 82 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 459 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is Displacement Length Ratio?

What is SA/D (Sail Area Displacement ratio)?

What is Relative Speed Performance?

Maintenance

Are your sails worn out? You might find your next sail here: Sails for Sale

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what to look for.

We are always looking for new photos. If you can contribute with photos for Sunwind 20 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

Fin with rudder on skeg

Specifications SUNWIND 20

19.68 ft / 6.00 m - 1970 - OY Nykra AB (FIN) - Tord Sundén

SUNWIND 20 Sailboat Data

Hull Type: Fin with rudder on skeg Rigging Type: Fractional Sloop LOA: 19.68 ft / 6.00 m LWL: 16.40 ft / 5.00 m S.A. (reported): 171.00 ft² / 15.89 m² Beam: 8.04 ft / 2.45 m Displacement: 3,638.00 lb / 1,650 kg Ballast: 1,653.00 lb / 750 kg Max Draft: 4.10 ft / 1.25 m Construction: FG Ballast Type: Iron First Built: 1970 Last Built: 1982 # Built: 200 Builder: OY Nykra AB (FIN) Designer: Tord Sundén

Information from  sailboatdata.com .

Hull Speed: 5.43 kn

• Choose the kind of boat Big boats Motor boats Rubber boats Sailing boats Sailing multihull boats

Nykra Sunwind 20

General Data

Shipbuilder:, see also: boats for sale.

• Jouet 20 (SHERIFF)
• Nessuno Catboat
• Vele International Group DEATETI
• Construction Nautic Edel Edel 600

Overall length:

Waterline length:, maximum beam:, displacement:, straightening:, construction materials:, sail details mq, equipments:.

Examples of sailboats from 1000 euro

Good offers from European sailboat market every 48 hours

Sunwind 20 with 4-stroke outboard motor Yamaha F4A 5 h.p. for 1800 euro

Meet little cutie Sunwind 20 with whole lot of equipment (more info about that below) and 4-stroke outboard motor Yamaha F4A 5 h.p. for 1800 euro

Location: Sweden

Length: 6 meters. Width: 2.45 meters. Draft: 1.25 meters Galley (kitchen): available Toilet: not available (you’ll have to be creative)

The seller pointed in his ads that price is negotiable, this means that you can reduce price to 1500 euro at least. Or maybe even more 🙂 ⠀

Moreover, the seller says that this sailboat may be sold together with a mooring place in yacht club (i.e. the mooring fees may be very cheap). I guess foreign buyer may embarrass a bit but I think that this matter can be arranged.

Sails in good condition, and it’s the whole sails set (main, genoa, staysail (2 pc.), spinnaker), 4-stroke engine Yamaha F4A (5 h.p.), navigator Lowrance Global Map 5300 C, new compass Silva 70P, knotmeter (speed measurer), autopilot, echo sounder, lights are replaced to LED, mooring equipment and so on.

As you see this boat is super-equipped, the owner invested a lot in this boat and made it for himself. I like the planning also, you may make double bed from the table in forward cabin. ⠀

Cushions on the photo are off but I think they are available (or you can sew new ones, it’s not expensive). Length is 6 meters (this means minimal fees in marinas) though width is 2.45 meters — like in average 8-meters yacht.

If you want to make your dream about sailing life come true – learn more about my package “An entry ticket to sailing life”.  https://how-to-buy-sailboat.com/book-and-course-package/

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Sails for Sailboat Designs: Sunwind

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SEAWIND 1170

The all new seawind 1170 is the latest model packed full of classic seawind dna design features with a modern set of lines, capable of both coastal cruising and more serious offshore sailing., uncompromised living space.

The Seawind 1170 has fantastic natural ventilation due to the large front opening Saloon windows, removable helm windows and trifold cockpit doorway. With the door secured safely into the cockpit roof when open, unrivalled open space is available for entertaining guests, unrestricted views and general living. With 6’5″ headroom throughout, the 1170 has generous accommodation space for a 39 ft catamaran

BUILT TOUGH FOR OFFSHORE SAILING

We see modern day cruising catamarans getting larger, but at 39 foot this compact Category A cruiser is built to take you anywhere and at the perfect size for a couple or small family to start a sailing adventure. With carbon reinforced foam core structure throughout, the Seawind 1170 is built with safety in mind. Practical deck layouts for short handed sailing and a stiff construction, this boat is cabale to take you where you want to go…

TWIN PROTECTED HELMS

A feature we have on all out Seawind models. Not only do twin helm stations offer excellent weather protection and safety, they also give you direct line of sight visibility on all four corners of the boat from either helm. On a slingle flat level, the skipper can easily switch from helm to helm whilst remaining amongst the action with your family, guests or crew for which you are responsible for whilst onboard.

UNCOMPLICATED AND REFINED INTERIORS

The Seawind 1170 uses a mix of structural composite furniture and timber finishes to keep the boat both light weight and functional whilst also having a high level of hand crafted timber fitout.

INTERIOR SPACE

Elevating sailing standard.

The multifunctional saloon area with rotating table offers excellent working space for those that need to check-in with business or other communications. Combined with a large navigation desk, the boat comfortably accommodates multiple work stations for when you need to connect.

Sailing performance was paramount to the design brief with the hulls being optimised for offshore cruising. Engineering is from world renowned Gurit of New Zealand, meeting full Category A conditions and manufactured using best practice techniques. Resin infusion throughout with extensive use of Carbon reinforcement in high load areas, vinylester resin for all hull laminates increasing structural properties and anti-osmosis protection.

The Seawind 1170 base specification is blue water capable with 2 x large fuel tanks (520L total) a large central water tank (500L), twin inboard 29hp inboard diesels and ample storage throughout. Optional large solar arrays and lithium battery banks further build on the self sufficient capabilities of the boat for people wanting to go off grid.

SPECIFICATIONS

Overall length, 39'3" / 11.9 m, 21'4" / 6.5 m, 3'9" / 1.2 m, displacement, 20,200 lbs / 9,200 kgs, 2 x 29 hp diesel inboards, 135 us gallons / 520 litres, fresh water, 132 us gallons / 500 litres, 910 sq ft / 84.5 sq m, sail area: jib, 296 sq ft / 27.5 sqm, sail area: main, 614 sq ft / 57 sqm, let's walk through, the perfect catamaran for seafaring comfort.

The all-new Seawind 1170 sets the standard for luxury cruising catamarans, redefining the experience for couples who seek both adventure and comfort on the open sea. Join us onboard as we explore the spacious interior, advanced sailing systems optimised for both functionality and aesthetic pleasure on this 39ft sailboat.

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Sunwind 311 - question about hull

• Thread starter Kostas Metaxas
• Start date Feb 16, 2024
• Forums for All Owners
• Ask All Sailors

Kostas Metaxas

Who could inform whether hull is based on Epoxy or Polyester resin?  

Kostas Metaxas said: Who could inform whether hull is based on Epoxy or Polyester resin? Click to expand

Welcome to SBO. The question is interesting. It is unlikely that a production boat would be constructed using “Epoxy”. Here is a link to SailboatData. It indicates “FG” meaning fiber glass as the construction material. SUNWIND 311 - sailboatdata The resin used most often in boat construction was Polyester Resin. This is due to costs. It was discovered in the late 80’s that the Polyester resins were creating an issue with osmotic blistering. The higher end boats switched to “Vinyl Ester” resins. The vinyl ester resin is more resistant to hydrolysis. While Epoxy resin is often used in repairs, it is more expensive and more difficult to work with. Since the Sunwind was first built in 1988 they may have used Vinyl Ester resins, but I would doubt it.  

Thank everybody for the reply. My boat got some damages to rudder and rudder tube securing in hull. I am looking for repairs. Is it good to make repair with non-epoxy resin? (repairs planned inside and outside) By the way, what budget level of repairs could I expect?  

Attachments

Ouch! Take Dave's advice (above). We were quoted $5000 (USD) for a new rudder. That did not include repairing the shaft tube or bearings, which you will need to do.  

You have a challenging project. Rather than tell you some of the ideas, I am attaching a source of knowledge that I trust and feel can help you in many more ways than just a single idea - quick answer. https://www.youtube.com/c/boatworkstoday Andy has demonstrated a deep and successful knowledge of the issues you will be facing. He is a valuable resource. You have several issues. You need to repair the rudder shaft log. You need to establish new shaft bearings. You need to empty the water out of the rudder and reestablish water integrity so water does not again enter and destroy the rudder from the inside. Andy has rebuilt rudders and recorded the process on his channel. If you are not a DIY type of person you will need to either buy replacements or hire the work to be completed.  

Thanks Everybody for taking part in assistance! Wish You nice weekend!  

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Kyosho Seawind RTR

The kyosho seawind offers new and seasoned captains a laundry list of standard features..

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The Kyosho Seawind RTR is a ready-to-run (or sail) version of the classic Seawind that first launched over 20 years ago. Earlier in the year, we brought you news of the Seawind Carbon Edition Readyset , and now we have a more budget-friendly RTR version thats back after being discontinued.

The hull is pre-assembled ABS, with a large aspect ratio keel, and it comes with waterproof servos and a 2.4GHz transmitter. The Seawind RTR retails for $359.97

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LIVE UPDATES

Baltimore Key Bridge collapse live updates: At least 6 unaccounted for, search efforts ongoing

A container ship struck Baltimore's Francis Scott Key Bridge early Tuesday.

A cargo ship crashed into Baltimore's Francis Scott Key Bridge early Tuesday morning, causing a near-total collapse of the span and halting vessel traffic into and out of the Port of Baltimore.

A search-and-rescue effort is underway, with divers and emergency personnel desperately combing the Patapsco River for people believed to have fallen from the collapsing bridge into the frigid water below, officials said. At least six people are unaccounted for, officials said.

Latest headlines:

'very much still a search and rescue mission,' governor says.

• Personnel on ship alerted officials before collision 'which undoubtedly saved lives': Biden
• No cars transiting bridge at time of collapse: Internal DHS briefing
• 6 unaccounted for

What to know about the collapse

The container ship Dali struck Baltimore's Francis Scott Key Bridge at about 1:30 a.m. Tuesday, partially collapsing the bridge , officials in Maryland said.

A local pilot was at the helm of the ship at the time, Maryland Department of Transportation Secretary Paul Wiedefeld said.

The crash appeared to be accidental , not intentional, officials said.

Two people were rescued from the Patapsco River and at least six people remain missing, officials said.

EPA on standby, not aware of any concerns

The regional office of the Environmental Protection Agency is on standby to respond to the aftermath of the bridge collapse if needed but is not aware of any environmental concerns at this time, according to EPA Mid-Atlantic Public Affairs spokesman Shaun Egan.

Synergy Marine Group said Tuesday morning that there was no pollution from the ship.

The Coast Guard is the primary federal agency responding and they have not asked for EPA assistance. Coast Guard pollution responders were sent to the scene, and if any releases of fuel or other pollutants are detected, the EPA official said the agency is ready to support that response.

-ABC News’ Stephanie Ebbs

Harris: 'We are all praying'

Vice President Kamala Harris said she is "praying for the families of those who are missing and all those who have been touched by this tragedy."

"I spoke with the governor of Maryland this morning, and we have directed the federal government to use all the resources that are available to assist with the search and rescue, to reopen the port and to rebuild the bridge as quickly as possible," Harris said while making a joint appearance with President Joe Biden at an event in North Carolina.

-ABC News’ Libby Cathey and Justin Ryan Gomez

Fourteen hours after the bridge collapse, crews are still desperately looking for the six people who remain unaccounted for, Maryland Gov. Wes Moore said at a news conference Tuesday afternoon.

"This is very much still a search and rescue mission," Moore said.

"We are hopeful and we are with the families," Sen. Ben Cardin, D-Md., said.

"This is no ordinary bridge -- this is one of the cathedrals of American infrastructure. It has been part of the skyline of this region for longer than many of us have been alive," Transportation Secretary Pete Buttigieg said. “So the path to normalcy will not be easy, will not be quick, will not be inexpensive. But we will rebuild together."

Buttigieg did not give an estimate of how long it may take to resume vessel traffic into and out of the Port of Baltimore.

Buttigieg discusses ongoing operations after Maryland bridge collapse

Buttigieg meets with responders

Transportation Secretary Pete Buttigieg traveled to the scene of the Baltimore bridge collapse, at the invitation of Maryland Gov. Wes Moore, according to the Department of Transportation.

Buttigieg posted a photo of him meeting with responders.

An estimated 30,000 vehicles crossed the bridge per day, according to the Maryland Transportation Authority.

Top Stories

Baltimore bridge collapse live updates: at least 6 unaccounted for, 'heroic': traffic onto baltimore key bridge halted before collapse, judge in new york hush money case places limited gag order on trump, dramatic video shows moment baltimore's key bridge collapsed, who is nicole shanahan, rfk jr.'s running mate.

At least 6 people unaccounted for after cargo ship crash levels Baltimore bridge

BALTIMORE — A major Baltimore bridge collapsed like a house of cards early Tuesday morning after it was struck by a container ship, sending several vehicles plunging into the dark water below, sparking an intense search for survivors and shutting down one of the nation's busiest ports.

Maryland Gov. Wes Moore declared a state of emergency and said the collapse of the Francis Scott Key Bridge was most likely the result of an accident and not an act of terrorism.

"Our state is in shock," the governor said.

Follow live updates here

Moore said the cargo ship Dali notified authorities that it had lost power and issued a mayday moments before the 984-foot vessel slammed into a bridge support at a speed of eight knots, which is about nine miles per hour.

Meanwhile, rescue crews using sonar detected at least five vehicles in the frigid 50-foot-deep water, including three passengers cars, a cement truck and another vehicle of some kind, Moore said. Authorities do not believe anyone was inside the vehicles.

An unknown number of workers were doing repairs on the bridge when the ship hit a support pillar, and at least six people were still believed to be missing, Moore said.

"This is still, very much, a search and rescue mission," he said during an afternoon news conference flanked by Transportation Secretary Pete Buttigieg and U.S. Sen. Ben Cardin, D-Md.

An 'active search-and-rescue posture'

Earlier, two workers were rescued from the water, Baltimore Fire Chief James Wallace said.

One was in good condition and refused treatment, Wallace said. The other was seriously injured and was being treated in a trauma center.

Moore said there might be drivers in the water were it not for the “folks” who, upon hearing the mayday, blocked off the bridge and kept other cars from crossing.

“These people are heroes,” Moore said. “They saved lives. They saved lives.”

Nearly eight years ago, the Dali was involved in another collision. In July 2016, the ship collided with a quay at the Port of Antwerp-Bruges in Belgium, damaging the quay.

The nautical commission investigated the accident, but the details of the probe were not immediately clear Tuesday.

The Dali is operated and managed by a company called Synergy Group. In a statement, the company said two port pilots were at the helm of the Dali at the time of Tuesday's crash and that all 22 crew members onboard were accounted for.

The bridge, which is about a mile-and-a-half long and carries Interstate 695 over the Patapsco River southeast of Baltimore, was "fully up to code," Moore said.

A 24-person team of National Transportation Safety Board investigators was already at the crash site.

NTSB Chairwoman Jennifer Homendy said that her agency will lead the investigation into the cause of the bridge collapse. She said a data recorder on board the ship could provide more information about what happened.

"But right now we're focusing on the people, on the families," she said. "The rest can wait."

President Joe Biden vowed to rebuild the bridge and send federal funds.

"This is going to take some time," Biden warned. "The people of Baltimore can count on us though to stick with them, at every step of the way, till the port is reopened and the bridge is rebuilt."

Speaking in Baltimore, Buttigieg echoed the president's promise.

"This is no ordinary bridge," he said. "This is one of the cathedrals of American infrastructure."

But Buttigieg warned replacing the bridge and reopening the port will take time, cost money, and could affect supply chains.

The Port of Baltimore is the 11th largest in the U.S. and the busiest port for car imports and exports, handling more than 750,000 vehicles in 2023 alone, according to data from the Maryland Port Administration.

The Dali was chartered by Danish shipping giant Maersk, which said it will have no choice but to send its ships to other nearby ports with the Port of Baltimore closed.

Writer David Simon, a champion of Baltimore who set his TV crime drama "The Wire" on the streets of the city he once covered as a reporter, warned online that the people who will suffer the most are those whose livelihoods depend on the port.

"Thinking first of the people on the bridge," Simon posted on X . "But the mind wanders to a port city strangling. All the people who rely on ships in and out."

Timeline of crash

Dramatic video captured the moment at 1:28 a.m. Tuesday when the Dali struck a support and sent the bridge tumbling into the water. A livestream showed cars and trucks on the bridge just before the collision. The ship did not sink and its lights remained on.

Investigators, in a timeline, said the Dali's lights suddenly shut off four minutes earlier before coming back on and then, at 1:25 a.m. dark black smoke began billowing from the ship's chimney.

A minute later, at 1:26 a.m., the ship appeared to turn. And in the minutes before it slammed into the support, the lights flicked off and on again.

Maryland Department of Transportation Secretary Paul Wiedefeld said the workers on the bridge were repairing concrete ducts when the ship crashed into the structure.

They were employed by Brawner Builders Inc. And at least seven workers were pouring concrete to fix potholes on the roadway on the bridge directly above where the ship hit, a foreman named James Krutzfeldt said.

Krutzfeldt, who was not working on that job, said one of the missing is another foreman whom he considers his mentor and “work dad.”

"I'm still kind of in shock," he said.

Earlier, the U.S. Coast Guard said it had received a report that a “motor vessel made impact with the bridge” and confirmed it was the Dali, a container ship sailing under a Singaporean flag that was heading for Sri Lanka.

Bobby Haines, who lives in Dundalk in Baltimore County, said he felt the impact of the bridge collapse from his house nearby.

"I woke up at 1:30 this morning and my house shook and I was freaking out," he said. "I thought it was an earthquake and to find out it was a bridge is really, really scary."

Families of bridge workers wait for updates

A group of people who said they were relatives of the Brawner construction workers gathered at a Royal Farms convenience store near the entrance of the bridge. Together, they waited for word of their missing loved ones.

One woman said that her father-in-law, Miguel Luna, was among the workers.

Some of the construction workers who still haven't been found recently had babies, Earl Schneider, a structural foreman with the company, said. 

“I know everybody on that crew personally," Schneider told NBC News. "They’re all great people. It’s tough. It’s been a rough morning.”

Jesus Campos, who also works for Brawner, told The Baltimore Banner that the missing men are from El Salvador, Guatemala, Honduras and Mexico.

Earlier, Baltimore Mayor Brandon Scott urged his constituents to pray for the missing workers — and the first responders struggling to locate them.

"This is an unthinkable tragedy," Scott said.

'A long road in front of us'

Built in 1977 and referred to locally as the Key Bridge, the structure was later named after the author of the American national anthem.

The bridge is more than 8,500 feet long, or 1.2 miles. Its main section spans 1,200 feet and was one of the longest continuous truss bridges in the world upon its completion, according to the National Steel Bridge Alliance .

About 31,000 vehicles a day use the bridge, which equals 11.3 million vehicles per year, according to the Maryland Transportation Authority.

The river and the Port of Baltimore are both key to the shipping industry on the East Coast, generating more than $3.3 billion a year and directly employing more than 15,000 people.

Asked what people in Baltimore can expect going forward, the state's transportation secretary said it is too early to tell.

"Obviously we reached out to a number of engineering companies, so obviously we have a long road in front of us," Wiedefeld said.

Julia Jester reported from Baltimore, Patrick Smith from London and Corky Siemaszko from New York City.

Julia Jester is a producer for NBC News based in Washington, D.C.

Patrick Smith is a London-based editor and reporter for NBC News Digital.

Corky Siemaszko is a senior reporter for NBC News Digital.

Advertisement

How the Key Bridge Collapsed in Baltimore: Maps and Photos

By Weiyi Cai ,  Agnes Chang and Lauren Leatherby

On Tuesday, a major bridge in Baltimore collapsed into the water seconds after it was struck by a cargo ship, sending vehicles on the bridge into the river below. The cause of the strike has yet to be determined.

The ship, a 948-foot-long cargo vessel called Dali, was about a half hour into its journey toward Colombo, Sri Lanka, when it hit a main pillar of the bridge. All crew members are safe, according to the ship owners.

A mayday call from the ship gave officials enough time to stop traffic at both ends of the bridge. The waters where the bridge collapsed are about 50 feet deep. By Tuesday morning, six construction workers who had been fixing potholes on the bridge remained missing as divers and other emergency workers on boats and helicopters continued to search for them. Two others had been rescued, and one was in the hospital.

Francis Scott

Patapsco River

The ship left the Port

of Baltimore around

1 a.m. on Tuesday.

Where impact occurred

Direction of the ship

The ship hit the

bridge at 1:28 a.m.

The ship hit the bridge at 1:28 a.m.

Where impact

Sources: Spire Global, Google Earth

The New York Times

The lights of the ship flickered on and off as it lost power in the minutes before the ship changed bearing and hit the bridge.

Ship approached from

the Port of Baltimore

Road repair crews

Ship changed heading

as it neared pillar

Ship made impact

with pillar

Southern and central spans

of bridge began to collapse within

seconds of impact

Northern span began to

collapse seconds later

Within 30 seconds of impact,

the central part of bridge had

entirely collapsed.

Source: StreamTime Live via YouTube

Timestamps are from StreamTime Live video.

The Francis Scott Key Bridge was built in 1977 and carried more than 12.4 million vehicles last year. The bridge was one of the three major ways to cross the Patapsco River and formed part of Baltimore’s beltway.

Gov. Wes Moore declared a state of emergency for Maryland and said that his office was in close communication with Pete Buttigieg, the U.S. transportation secretary. The White House issued a statement saying that President Biden had been briefed on the collapse.

Tasos Katopodis/Getty Images

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Sunwind 311

The sunwind 311 is a 30.74ft fractional sloop designed by tord sundén and built in fiberglass since 1988..

The Sunwind 311 is a moderate weight sailboat which is a reasonably good performer. It is very stable / stiff and has a good righting capability if capsized. It is best suited as a coastal cruiser. The fuel capacity is originally very small. There is a very short water supply range.

Sunwind 311 for sale elsewhere on the web:

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• Sailboat Guide

Sunwind 26 is a 25 ′ 7 ″ / 7.8 m monohull sailboat designed by Tord Sundén and built by OY Nykra AB (FIN) between 1978 and 1982.

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)

Replaced with SUNWIND 27.

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