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The International 505 is a one-design high-performance two-person monohull planing centreboard dinghy, with spinnaker, using a trapeze for the crew. While it is a high-performance boat and demanding in a blow, the 505 is an extraordinarily well-handling craft and is easier to control than many smaller trapeze boats. The genesis of the class began in 1953 with the creation of the 18-foot 'Coronet' dinghy designed by John Westell. This sailboat competed for the two-person performance dinghy classification for the Olympics at the International Yacht Racing Union (IYRU) trials of 1953 held at La Baule, France. In 1954, the Caneton Association of France requested John Westell to make significant changes to the design to suit their needs. This reduced the overall length, weight and sail area to become the 505, so named for its length of 5.05 metres.〔(【引用サイトリンク】title=International 505 )〕 The class achieved international status with the IYRU in 1955. The 505 is a very popular international class and is raced actively in 18 countries around the world. World championships are held every year at locations around the world, rotating by continent, and attract over 100 boats on the start line. At the 2005 world championships held in Warnemünde, Germany there were 171 boats. The 2009 World's were held in San Francisco. The 505 may be sailed in a mixed fleet using the Portsmouth Yardstick handicap scheme. Its Portsmouth number (administered in the UK) is 902〔(【引用サイトリンク】title=Portsmouth Number List 2012 )〕 and its D-PN (administered in the USA) is 79.8 .〔(【引用サイトリンク】title=Centerboard Classes )〕 The design of the boat's hull shape and sailplan are tightly controlled, while the spars, foils and disposition of the rigging is open. This allows the boats to be set up to the needs of the sailor, rather than controls established by the class association, resulting in a high level of adaptability to sailing styles. There are a number of successful sail/layout combinations. This freedom to rig as you please allows a remarkably wide range of crew weights and configurations to be competitive, even in big regattas. Successful teams come in many combinations, including all-female, all-male, mixed, and child/adult or child/teen. The open aspect of the class fosters a greater degree of seamanship and boat wisdom, as teams learn to understand and become proactive in issues such as proper sheeting-lead position, standing-rigging attachment, secure equipment foundations and all the other aspects of rigging and layout which are so important to the well-rounded and knowledgeable sailor. As of 2005, there are 14 known builders throughout the world. Construction materials range from fiberglass/polyester to carbon fibre, with just about every conceivable construction material used at one time or another within the class. Modern boats with modern materials are capable of remaining competitive at the international level for ten years or more. As of 2009, over 9000 505s had been built since 1954. Various experimental modifications to the accepted design, outside of the class rules, have been conducted at different points in history. Such modifications have included setting up a double-trapeze system, installation of a bowsprit, and inclusion of an asymmetric spinnaker. However, those who know and love the 5o5 eschew the bowsprit, as the symmetrical chute and traditional pole give better performance on the typical windward-leeward courses run today. ==Events== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「505 (dinghy)」の詳細全文を読む スポンサード リンク
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