page_title: 5.5 Metre (keelboat)
section_title: Class association
hierarchical_section_title: 5.5 Metre (keelboat) / Class association
caption_attribution_description: English: 5.5 Metre keelboat photo d ramey logan
context_page_description: The International 5.5 Metre class was created to yield a racing keel boat giving a sailing experience similar to that of the International 6 Metre Class, but at a lower cost.
  The main class regulation is a restriction on a single quantity output from a formula involving the boat's rating length L, weight and sail area S; the regulation states that the output of this formula must not exceed 5.500 metres. There is considerable scope for variations in design while still meeting this restriction, and as a result each 5.5 metre boat is unique.
  If the design parameters of a proposed new boat result in a formula output exceeding 5.5 metres, then one or more of the parameters must be suitably adjusted. Performance data gained from testing models towed in a long water tank can suggest optimal combinations of parameters.
  The 5.5. metre rule is a variant of the International Rule that was established already in 1907. The 5.5. is therefore closely related to larger metre boats such as the 6mR, 8mR and the 12mR.
  Since 2010 the 5.5 Metre is one of the Vintage Yachting Classes at the Vintage Yachting Games.
context_section_description: The object of the International 5.5 Metre Class Association is to promote and develop 5.5 Metre racing throughout the World. The first President of the association was Mr. Owen Aisher.
  Since the development of the class spanned more than half a century the early boats are not competitive to race against the modern designs. Therefore, the association made, in 2007, divisions in the class based upon age of the boat:
  Classic Fleet (Designs before 1970)
  Evolution Fleet
  Modern Fleet (Designs from 1994)
  During major races there are separate trophies per fleet, however if a classic fleet boat beats the modern fleet, the classic fleet boat wins the modern fleet trophy.
caption: International 5.5 Metre
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