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The 12 Metre class was used in the Olympic Games of 1908, 1912 and 1920 but few boats participated in these events. The 12 Metre class boats are best known as the boat design used in the America's Cup from 1958 to 1987. Competitiveness between boats in the class is maintained by requiring the boats to be in compliance with the 12 Metre formula.
Name Year of first construction Designer Builder Notes 12 Metre: 1907: Development class: 2.4 Metre: 1980: Development class: 5.5 Metre: 1949: Development class
A ship in a force 12 ("hurricane-force") storm at sea, the highest rated on the Beaufort scale. The Beaufort scale (/ ˈ b oʊ f ər t / BOH-fərt) is an empirical measure that relates wind speed to observed conditions at sea or on land. Its full name is the Beaufort wind force scale.
True wind (V T) is the same everywhere in the diagram, whereas boat velocity (V B) and apparent wind (V A) vary with point of sail. Forces on sails result from movement of air that interacts with sails and gives them motive power for sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and sail-powered land vehicles.
They are especially advantageous for heavy yachts with a lot of sail area (as 12-metre class boats), sailing upwind when the draft is limited by the class rule or by the requirement to be able to sail in shallow water, because in that case high righting moment and efficient side force are difficult to obtain.
C yachts are fit for wind force 6—27 knots (14 m/s)—and 6.6-foot (2 m) maximum wave heights, encountered in exposed coastal waters, bays inlets, lakes and rivers. D yachts are fit for wind force 4—16 knots (8.2 m/s)—and 1.6-foot (0.5 m) maximum wave heights, encountered in sheltered coastal waters, bays inlets, lakes and rivers.
Kookaburra III (KA 15) was the Australian 12 Metre yacht sailed by Iain Murray in the 1987 America's Cup held off of Fremantle, Western Australia.Murray won the Defender Selection and Kookaburra III represented Australia in the America's Cup, where she lost to American challenger Dennis Conner sailing Stars & Stripes 87.
Weatherly is a keel sloop designed to the 12-metre Rule. She was designed by Philip Rhodes and built by Luders Marine Construction Company at Stamford, Connecticut in 1958 for a syndicate of owners formed by New York Yacht Club members Henry D. Mercer, Cornelius S. Walsh and Arnold D. Frese.