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28-665: It is a single hander with trapeze and racks, and a hydrofoil system similar to the International Moth . The Moth's ultra light weight have made them unsuitable for heavier sailors, the RS600FF was to an extent inspired by the Moth, but being bigger and suited to heavier crews was "made over" despite it being a one design class. Differences between a brand new RS600FF and a brand new RS600 are: Conversion are old (or new) conventional RS600's with modifications. The main difference

56-547: A flexible or jointed structure (for hard wingsails). Wingsails are typically mounted on an unstayed spar—often made of carbon fiber for lightness and strength. The geometry of wingsails provides more lift, and a better lift-to-drag ratio , than traditional sails. Wingsails are more complex and expensive than conventional sails. Wingsails are of two basic constructions that create an airfoil, "soft" and "hard", both mounted on an unstayed rotating mast. Whereas hard wingsails are rigid structures that are stowed only upon removal from

84-412: A heavy, narrow scow or a blunt nosed skiff, (weighing about 50 kg) to today's remarkable foilers with hull weights of under 10 kg. Designs have run the gamut from wide skiffs without wings, to lightweight scows, to wedge-shaped hulls characterized with narrow waterlines and hiking wings out to the maximum permitted beam. Likewise, the sail plan has evolved from cotton sails on wooden spars, through

112-539: A number of achievements. In 1966–67, The King of Siam was involved in the building of three Moths and sailed them on the pond at Chitrlada Palace. The King raced for almost 20 years on his second moth called 'Super Mod' until his design and construction efforts were cut short by the 'press of royal duties'. In 1957 Patricia Duane became the first woman to win the Moth World Championship in her Cates-Florida design. In 1968 Marie Claude Fauroux became

140-610: A smaller number of International Moths of both scow and skiff type. Hulls were noticeably lighter -down to 23kgs for skiffs using plywood by 1970. The international yacht designer Bruce Farr built Moths to his own design in the 1967-1971 period when still a young school boy. In the United States in the late 1970s participation in the International Moth class died and the class growth and interest moved to Europe and Australia. After ten years of little Moth activity in

168-729: Is the hydrofoils: Changing the hull material is not possible, however even if the following are missing the boat would still be considered an FF The RS600 conversion's are reversible, they can be taken off to convert the boat back. Moth (dinghy) The Moth is a small development class of sailing dinghy . Originally a small, fast home-built sailing boat designed to plane , since 2000 it has become an expensive and largely commercially produced boat designed to hydroplane on foils though many are still built at home, typically at much lower cost. The pre-hydrofoil design Moths are still sailed and raced, but are far slower than their foiled counterparts. There have been several types of Moth since

196-584: The camber or curvature of the wing, raising the maximum lift coefficient —the lift a wing can generate—at lower air speeds (speed of the air passing over it). A wingsail has the same need for camber adjustment, as windspeed changes—a straighter camber curvature as windspeed increases, more curved as it decreases. Mechanisms for camber adjustment are similar for soft and hard wingsails. Each employs independent leading and trailing airfoil segments that are adjusted independently for camber. More sophisticated rigs allow for variable adjustment of camber with height above

224-519: The "National Moth Boat Association" and in 1935, due to increasing overseas interest, changed its name to the "International Moth Class Association" or IMCA. In 1933, an American magazine, The Rudder, published an article dealing with the Moth Boat scene in the US. The Australians noted the similarities between the two groups of boats and intuitively realized that the name "Moth Boat" rolled more easily from

252-471: The 1938 AGM this was changed to once per year. Similar boats Wingsail A wingsail , twin-skin sail or double skin sail is a variable- camber aerodynamic structure that is fitted to a marine vessel in place of conventional sails . Wingsails are analogous to airplane wings , except that they are designed to provide lift on either side to accommodate being on either tack . Whereas wings adjust camber with flaps , wingsails adjust camber with

280-699: The Australian Moth class as a national class in 1962, the first small boat class in Australia to be granted national status. Australian Moths were using pre-bent and wing masts in the 1950s. In the 1960s, Australian Moth sailors campaigned for rules changes that would permit the Australian Moths to compete in the IMCA's "World Championships". European interest increased after the second world war. The European Moth clubs subscribed, more or less, to

308-784: The CMBA is to revive the original US version of the boat and update the rules so that development is permitted without allowing the boats to become too freakish. The IMCA rules from 1965, the final year prior to the phase-in of the Australian rig and wings were consulted as a starting point for reviving the US Moth. Those rules have been revised where necessary. Interest in Classic Moths has grown internationally, with new activity in Europe, primarily France. The International Moth has fostered

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336-618: The Inverloch Yacht Club was formed. Restrictions for the class known as the Inverloch Eleven Footer class were then drawn up, with the distinguishing characteristic that of being not a one-design boat but rather that of a boat permitting development within the set of design parameters. At much the same time, 1929 in fact, halfway around the world another development class, the American Moth Boat

364-537: The US class rules. One European Moth design from the early 1960s, the "Europa Moth", broke away from the IMCA and formed the one-design Europe dinghy class. It was adopted as the woman's single-hander used in the Olympic games from 1992 to 2004. In 1971 the US-based IMCA completed a phase-in of new rules which attempted a "marriage" of the IMCA and the Australian Moth. This amalgamation process had started at

392-528: The US, several sailors started looking for old Moth Boats with the original US rig to restore and race. A newsletter was started to aid communication between like-minded Mothists. Racing of "Classic Moths" resumed in 1989 and in 1990 a new club was formed to govern racing and construction of Classic Moths. This club, the Classic Moth Boat Association or CMBA is the current governing body for the original US type of Moth Boat. The intent of

420-596: The annual IMCA meeting in 1965. New rules embraced the larger, more powerful high aspect, loose footed, fully battened rig of the Australian Moth. The new rules also permitted controversial hiking wings first seen on Moths from Switzerland. Finally, guided by the influential UK Moth sailor and WW2 war hero, Major Tony Hibbert, the rule change abolished the US centralized organization of the class in favor of an independent world body with equal-partner national associations. Each national association elected its own officers and world body representatives. The culmination of these changes

448-406: The boat, soft wingsails can be furled or stowed on board. L. Francis Herreshoff pioneered a precursor rig that had jib and main , each with a two-ply sail with leading edges attached to a rotating spar. The C Class Catamaran class has been experimenting and refining wingsails in a racing context since the 60s. Englishman, John Walker, explored the use of wingsails in cargo ships and developed

476-665: The early 1930s. The class was restricted to a particular hull shape of a 1930s Vintage American Moth Boat, and is thus a one-design boat, not a development class which allows experimental development with shapes and materials. The Victorian Moth Class Association was formed in Australia in 1936. After WWII, the NSW Moth Class Sailing Association was formed, with foundation members coming from Seaforth Moth Club and Woolahra Sailing Club. all other Australian states formed Moth Associations between 1956 and 1961. The Australian Yachting Federation (AYF) recognized

504-623: The first practical application for sailing yachts in the 1990s. Wingsails have been applied to small vessels, like the Optimist dinghy and Laser , to cruising yachts, and most notably to high-performance multihull racing sailboats, like USA-17 . The smallest craft have a unitary wing that is manually stepped. Cruising rigs have a soft rig that can be lowered, when not in use. High-performance rigs are often assembled of rigid components and must be stepped (installed) and unstepped by shore-side equipment. Wingsails change camber (the asymmetry between

532-412: The first use of the class name in the 1920s: The current International Moth is a result of merging two separate but similar historical developments. The first occurred in Australia in 1928 when Len Morris built a cat rigged (single sail) flat bottomed scow (horizontal bow rather than the "normal" vertical bow) to sail on Andersons' Inlet at Inverloch , a seaside resort 130km from Melbourne . The scow

560-489: The first woman skipper to win a World dinghy racing title from an IYRU sanctioned international class, in her Duflos-designed moth. The International Moth was selected as an official training class for the Japanese Olympic sailing team, to hone their balance skills. Since 2000 International Moths have begun using lifting hydrofoils on the daggerboard and rudder, which lift the entire hull and skipper above

588-566: The fully battened Dacron sails on aluminum spars, to the windsurfer inspired sleeved film sails on carbon masts seen today. In New Zealand the class reached its maximum popularity in the late 1960s and early 70s. The NZ Moth was standardized as a 41kg flat bottom scow type known as the Mk2 using an alloy spars and a Dacron sail. The measured sail area was nominally 7.4 square metres but the actual area grew to about 8.2 square metres by 1970. Many hundreds were home made by amateurs. In addition there were

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616-458: The tongue than "Inverlock Eleven Footer Class", and changed the name of their class to Moth. The Australians also noted the differences, particularly in sail plan between the two boats, but since this was in the middle of the great depression, and the two groups were more than 20000 kilometres apart, no attempt was made to reconcile these differences. Thus two large Moth classes developed separately for over 30 years. The British Moth Class dates to

644-474: The top and the bottom surfaces of the aerofoil ), depending on tack and wind speed. A wingsail becomes more efficient with greater curvature on the downwind side. Since the windward side changes with each tack, so must sail curvature change. This happens passively on a conventional sail, as it fills in with wind on each tack. On a wingsail, a change in camber requires a mechanism. Wingsails also change camber to adjust for windspeed. On an aircraft, flaps increase

672-409: The water surface, dramatically reducing drag and increasing speed. The top speed achieved as of 2018 is 36.5 knots, the highest 10 second average of 35.9 knots (66.5 km/h) was recorded on 14 May 2014. This high speed is reflected in the International Moth's RYA Portsmouth Yardstick of 570, the fastest (As of 2016 ) of any sailing dinghy or multihull. was sailed for twice in the same year. At

700-502: The water to account for increased windspeed. The presence of rigging, supporting the mast of a conventional fore-and-aft rig limits sail geometry to shapes that are less efficient than the narrow chord of the wingsail. However, conventional sails are simple to adjust for windspeed by reefing . Wingsails typically are a fixed surface area. Conventional sails can be furled easily; some flexible wingsails can be dropped, when not in use; rigid wingsails must be removed when exposure to wind

728-430: Was hard chined , 11 feet (3.4 m) long, with a single 7.4 square metres (80 sq ft) mainsail. The craft was named "Olive" after his wife. The construction was timber with an internal construction somewhat like Hargreave's box kite. "Olive's" performance was so outstanding, that a similar boat "Whoopee" was built. Len Morris then sold "Olive", and built another boat called "Flutterby", and with those three boats,

756-610: Was started by Captain Joel Van Sant and Ernest J. Sanders of Elizabeth City, North Carolina with the boat “Jumping Juniper” built of Atlantic White Cedar from the Great Dismal Swamp . The major difference between the Australian and American boats early on was that the American boat used only 72 square feet (6.7 m ) of sail on a somewhat shorter mast. The US development class was formally organized in 1932 as

784-528: Was the recognition in 1972 of the IMCA by the International Yacht Racing Union (the forerunner of today's World Sailing) bound by the agreed upon new restrictions of the class (with metric measurement conversions) operating today. The moth class association that had originated in the US was now truly an international organization. Being a development class, the Moth has evolved from a hull in the 1930s that could best be described as

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