moth sailboat for sale usa

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

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('cloak963d7c3efa2dee02fd701daa244933be').innerHTML = ''; var prefix = 'ma' + 'il' + 'to'; var path = 'hr' + 'ef' + '='; var addy963d7c3efa2dee02fd701daa244933be = 'raavang' + '@'; addy963d7c3efa2dee02fd701daa244933be = addy963d7c3efa2dee02fd701daa244933be + 'new' + '.' + 'rr' + '.' + 'com'; var addy_text963d7c3efa2dee02fd701daa244933be = 'raavang' + '@' + 'new' + '.' + 'rr' + '.' + 'com';document.getElementById('cloak963d7c3efa2dee02fd701daa244933be').innerHTML += ' '+addy_text963d7c3efa2dee02fd701daa244933be+' ';  or call cell # (920)904-2167.

early Ventnor

This is an early Ventnor with an unknown registration number. 

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.

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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!

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.

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.

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

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.

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

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 6-7, 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!

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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Bladerider Moth Sailboat

• By Alan Block
• Updated: August 21, 2007

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/

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NEW Mach 2 Moth!

The design brief for the Mach2 could not have been simpler: The boat had to be fast enough to win the World Championships, but it must be also capable of achieving this "straight out of the box" Our goal is that the black art of "tweaking" will not apply to this boat in the way it has to other production designs, that those "in the know" do not have an advantage over your regular Jo.

Everything is just right, from the foils that are designed at exactly the right angle, to the sophisticated wand system, and whilst clearly the International Moth is a development class, care has been taken to ensure that the boat will work perfectly, straight from the box.

But the design brief was also to make a boat of such quality that owners would be proud, whether they are racing at world level, or just enjoying some free ride time on the water. Pride comes from not only having a desirable product, but a dependable one too, and as a result great care has been taken over the tooling, material selection and method of construction.

The hull shape has been designed to be as fast as possible at "take off" speed. This is the only traditional requirement of the hull, the rest of the time its in the air. And that's where windage is important and the lack of any flair to the deck, the first on a production boat allows an easy flow of air around the boat from most angles.

The Dreadnought bow not only looks great but also reduces windage. Equally it minimizes resistance as the hull punches through waves going downwind in rough conditions. This means that the boat doesn't "load up" so easily and is therefore more manageable and quicker.

The sexy transom, a feature that immediately catches the eye, is designed to put strength into that area whilst taking weight out.

Finally the unique triangular centerboard case is moved further forward to increase stability and share the lifting loads more equally between the two foils.

The 2.6 is the 6th major upgrade to the MACH2 moth, with the 2.5 and 2.4 already a proven winning formula with top results all over the world. The 2.6 is without a doubt showing more speed and control over the previous MACH2 configurations. As you can see reading through the list of updates and advances below, there is not one part of the boat that has not been examined and re-engineered to increase speed and performance. The MACH2 has always been the pace-setter. With the release of the MACH2.6, we continue to be at the cutting edge of Moth design.

The MACH2.6 introduces a more efficient and user friendly control system to make a better overall experience.

• all go via central deck plate inside wing tramps to cleats on outer wing bar plate.
• downhaul - on deck 16:1 purchase - continuous.
• vang 48:1 hidden inside sail skirt, (no lever!!) - also continuous.
• outhaul, gearing.
• provision for rake and/or cant.
• on centerboard for easy adjustment and visual feedback.

• front wing curves upwards to create correct leading edge shape to keep flow attached on the underside of the leeward tramp.
• rear wing curves downward to exhaust and direct the flow on the top surface.
• 60mm higher for enhanced leverage.
• no compression bar.
• net effect is to convert what was a very draggy leeward wing to low drag with forward drive.
• i.e. the wingbar and tramp acts like having additional sail area.
• instantly noticeable when you lock into high mode upwind sailing.
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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.

• Moth Mart (second hand)
• Aardvark Racing – Rocket
• Fluid Composites – Maverik
• Mackay Boats – Bieker
• Garda Carbon Lab – Manta
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Bieker Moth

When speed matters..

When a group of top navel engineers, designers and builders come together with very few design restrictions, the meaning of fast is redefined. Meet the Bieker Moth.

Find out more in the Features section below

BM-V3 Specifications

Length overall           3.355 m

Beam                         2.250 m

Max. luff length        5.185 m

Max. mast length     6.250 m

Hull weight                Unrestricted, general weight range 10-20kgs

Rigged Weight          as little as 26kgs

Sail area                    8.25m

Optimum skipper weight     60-80kgs

Producing complete consistency is our goal.  Every part is checked, weighed and recorded so we have a complete build record for each boat.

Sailors can also apply their own expertise to develop their boats further.

Spare parts can be fitted easily and means that upgrade parts can be adapted to existing boats.

A comparatively high-volume displacement shape, with a rocker profile provides an easy, low ride handling and un-sticky take-off characteristics.

The sleek hull shape (BM-V1) is designed to optimise aerodynamic flow (this is based on a recent 2023 flow analysis).

An aircraft grade honeycomb is used to produce a significantly light weight yet stiff boat.  The maximum stiffness to weight ratio has been achieved.

The laminate is a custom-made spread tow tri-axel pre-preg carbon fibre that reduces weight while adding torsional stiffness. High load points have been reinforced with unidirectional carbon fibre patching.

Built from a hi-temp carbon tooling prepreg, this mould helps to produce exceptional hull accuracy and consistency which means lighter hulls and precise alignment of all the components.  

Wing Beams and Solid Wings

Using minimal surface area, the planform minimises aerodynamic drag while maximising heeling moment.

 The wing is designed to let sailors impart kinetic energy into the boat during tacks and gybes.

Stiff single piece wing beams help maximise heal to windward.

 The wing beams are high modulus pre-preg carbon, designed to eliminate the need for compression struts and unnecessary joins.

This rigid wing frame also reduces windage and streamlines the planform.

BM-V3 Wing Shape and Section Enhancements

•            An adjustment to the wing angle which increases the righting moment when sailed at the optimum heel angle.

•            Single one-piece beams used for ultimate strength and stiffness, with the fore and aft beam section shape refined to encourage attached flow.  

The outer beam is now incorporated into the wing decks.

•            A redesign of all connections between beams, wing decks and deck.

•            A reduction of the planform areas.

•            A slight reduction in weight.

Designed with a deck-sweeping rig in mind, a forward deck fairing on the deck aft of the mast enables the sail to be sealed onto the deck.

BM-V3 Deck Interface Enhancement

An incredibly clean wing and deck area enables easy maneuverability along with aero drag reduction. The new deck shape completely conceals the controls with the only rope visible is from the cleat plate to the outboard end of the tramp.   Even the cleats themselves are mostly hidden.

BM–V3 Below Deck Enhancement

Space under the deck is used to house all the systems and controls. This removes drag created from the control lines on the wings and keeps the weight centralised. Now with a larger systems area, all systems move more efficiently which make for easier adjustments.

The gantry’s defined lines and curves, combined with its 3-point attachment system ensures a lightweight that optimises airflow off the stern. As per the Class rule, the gantry is not watertight. It will hold water, including when the boat is at rest. 

The Mackay Bieker BM-V3 Revealed

Mackay Bieker BM V3 - deck interface

Mackay Bieker BM V3 Wing shape

What is the difference between standard v'slow drag verticals.

The low drag verticals have less area. They are shorter and also narrower in some areas. As a result they are also lighter.

What is the difference between the horizontals?

Area and section shape. More area has more drag, but it also lifts the boat sooner in lighter winds. Section shape varies the amount of lift and drag. For heavier air foils the emphasis is more on reducing drag. On lighter air foils lift becomes more important, but not if it increases drag too much. It is always a compromise which is why development will always continue in the quest for more lift with less drag.

Why do some people choose soft wings v's solid wings?

Solid wings have some handling advantages and aerodynamic advantages.

Soft wings are lighter.

For bigger sailors, the trade off is often in favour of having a lighter platform, whereas lighter sailors can take the aero gain of the solid wings.

How do I choose which deck fairing to use?

To get the most aerodynamic gain, the deck faring should match or be a little longer than the foot length. Theoretically, longer is better, but it is also hard to sail with. It is no problem to cut down the length of a deck fairing to match your sail should you change at a later date.

Why are there 2 different travel boxes?

The Hi-Top box is needed if you want your solid wings to fit into a box with your boat. Alternatively you can use the standard box and package the wings separately if you don’t travel a lot.

Air freight is charged by volume, so it costs less if you use the smaller box and pack the wings separately. However, this also has its risks, so we recommend the Hi-top box if you are regularly freighting your boat to reduce the chance of your wings being damaged or lost.

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Yachting World

• Digital Edition

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

• 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

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

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

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

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

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

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

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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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Moth International presentation

The model Moth International has 2 differents versions : Moth Foiler , Moth Classic .

The Moth International, laboratory of light sailing

The international moth underwent an unprecedented upheaval during the 2000s with the appearance of load-bearing daggerboards and rudders. The moth foiler was born and it started a revolution in extreme light sailing.

Using carbon in profusion, for the mast, hull and wings, this small dinghy can reach astonishing speeds for such a small size, once the learning phase and the first baths are over.

Most hydrofoil motorboats are not built by amateurs, but since 2006 KaSails has been building the Bladerider as a series production boat. The most recent current models are the Mach 2 and the Exocet.

Second hand market of MothInt

There are moths foilers at all prices. Series with development, the material is quickly obsolete if you want to shine on the championships. On the other hand, if you want to sail or fly without pretension, you can find very accessible boats.

Alternatives to the moth foiler

Some figures of the moth international sailing dinghy  :.

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Used Moth International price table