Engineering:5.5 Metre (keelboat)

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International 5.5 Metre
5.5 Metre insigna.png
Class symbol
5.5 Metre (keelboat).svg
Development
DesignerCharles E. Nicholson (rule designer)
Year1949 (rule design)
DesignDevelopment class
Boat
Crew3
DraftMaximum: 1.35 m (4 ft 5 in)
Hull
TypeMonohull
Hull weightMinimum: 1,700 kg (3,700 lb)
Maximum: 2,000 kg (4,400 lb)
LOAAbout: 9.5 m (31 ft)
BeamMinimum: 1.92 m (6 ft 4 in)
Hull appendages
Keel/board typeFixed
Sails
Spinnaker areaAbout: 50.0 m2 (538 sq ft)
Upwind sail areaMinimum: 26.5 m2 (285 sq ft)
Maximum: 29.0 m2 (312 sq ft)
Former Olympic class
[edit on Wikidata]

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 (expressed as a displacement D) 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 (referred to in yacht design as Ship model basin) can suggest optimal combinations of parameters. The 5.5. metre rule is a variant of the International Rule (sailing) 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.

History

5.5-metre class Olympic race in Helsinki 1952. Boats are German Tom Kyle (G I), Gold medalist Complex II (US I) and Danish Jill (D 2).

The 5.5-metre class was a redesign of the 6-metre class by Charles E. Nicholson in 1937. The first boats conforming to the 5.5-metre rule were built in 1949. There had been an earlier attempt to build a cheaper alternative to the Sixes. In 1929 the 5-metre class was established by the French "Union de Societes Nautique Francaise" and the class was accepted in London. It achieved a position as the smallest new international metre class and some hundreds boats were built. Nevertheless, the 5 metre never managed to achieve an Olympic status. The 5.5-metre class replaced it quickly and was raced in Olympics for first time in 1952 Summer Olympics in Helsinki. The Scandinavian Gold Cup has also been competed with 5.5m boats since 1953. 5.5 metre boats replaced the International 6-metre at the 1956 Olympic Games held in Melbourne, Australia . The 5.5 metre participation in the Olympic sailing events continued at the 1960 Olympic Games and 1964 Olympic Games. During the 1960s it however began to draw similar criticism as preceding six-metre class - namely, increasing costs - and the boat lost Olympic status after 1968 Olympic Games, due to excessive design and building costs of one off boats, marking the end of development class keel boats in Olympic regattas. However, the class remained active thereafter and 5.5-metre boats are still very actively raced.

The formula

The measurement formula is given in the 2006 International Five Point Five Metre Rating Rules:

[math]\displaystyle{ 5.500 \mbox{ metres} \ge 0.9 \cdot \left( \frac{L \cdot \sqrt[2]{S}} {12 \cdot \sqrt[3]{D}} + \frac{L + \sqrt[2]{S}} {4} \right) }[/math]

where

  • [math]\displaystyle{ L }[/math] = length for rating
  • [math]\displaystyle{ S }[/math] = measured sail area
  • [math]\displaystyle{ D }[/math] = displacement in cubic metres

Events

Olympic Games

World Championship

[1]

Vintage Yachting Games

Template:Medals table

|- | 2012 Lake Como | Finland
Anders Nordman
Robert Segercrantz
Johan Hjelt | Germany
Hubert 'Biwi' Reich
Wolfgang Oehler
Christian Hemmerich | France)
William Borel
Yves Duclos-Grenet
Adrien Baumelle |} [2]

Pan American Games

Template:Medals table

|- | 1959 Chicago | United States | Canada | Ecuador |} [3]

European Championships

Template:Medals table

This list is incomplete; you can help by expanding it.

|- | 1968 Neuenburger See[4] | Toucan IX (SUI)
Louis Noverraz | Nadezhda VI (URS)
Konstantin Alexandrov | Janael (FRA)
Breteche |- | 1980 Bénodet |  Switzerland (F)
Sprecher | France (F)
Souben |  Switzerland (Z)
Capecchi |- | 1993 Cannes[5] | The Sting (SUI)
Christian Wahl | Zenda Corn (NOR)
Kalle Nergaard | My Shout (USA)
Glen Foster |- | 1995 Thun[6] |  Switzerland
Daniel Schenker
Christoph Schenker
Eric Waser |  Switzerland
Jürg Menzi
Jürg Christen
Dino Fumasoli |  Switzerland
Bruno Marazzi
Stefan Haftka
Flavio Marazzi |- | 1997 Le Crouesty | United States (FRA)
Glen Foster |  Switzerland (SUI)
Jean-Claude Vuithier |  Switzerland (SUI)
Jürg Menzi |- | 1998 Cannes |  Switzerland (FRA)
Christian Wahl | Norway (NOR)
Kalle Nergaard | United States (USA)
Glen Foster |- | 2000 Genoa[7] | Joker 8 (SUI)
Thomas Moser
Felix Meyer
T. Sprecher | Salamander 5 (GBR)
Jonathan Janson
Mark Downer
Rupert Richardson | Marie-Françoise 14 (SUI)
Jürg Menzi
Juerg Christen
Daniel Stampfli |- | 2005 Attersee | Marie-Françoise 17 (SUI)
Jürg Menzi
Daniel Stampfli
Gaume |  Switzerland
Christoph Burger

|  Switzerland
Hans-Peter Schmid

|- | 2008 Mariehamn | Norway (FIN)
Kristian Nergaard
Petrus Eide
Johan Barne | Norway (NOR)
Christoph Burger
Christof Wilke
Mathias Dahlman
Dominik Neidhart 1st race only |  Switzerland (SUI)
Jürg Menzi
Daniel Stampfli
Léonard Gaume |- | 2013 Benodet | Norway (FIN)
Kristian Nergaard
NN
NN | Norway (SUI)
Bernard Haissly
NN
NN |  Switzerland (SUI)
Jürg Menzi
NN
NN |} [8]

Scandinavian Gold Cup

Class association

International 5.5 Metre

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.[9]

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:[10]

  • 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.

References

  1. ↑ "World Championships". http://sports123.com/sai/ow-5.5m.html. 
  2. ↑ Vintage Yachting Games
  3. ↑ "PanAm results". http://sports123.com/sai/opa-5.5m.html. 
  4. ↑ "International 5.5 Metre Class Association". http://www.5.5class.org/archives/68/1968.html. 
  5. ↑ "International 5.5 Metre Class Association". http://www.5.5class.org/archives/93/european1993.html. 
  6. ↑ "International 5.5 Metre Class Association". http://www.5.5class.org/archives/95/european1995.html. 
  7. ↑ "International 5.5 Metre Class Association". http://www.5.5class.org/archives/00/european_genova.html. 
  8. ↑ "European Championships". http://sports123.com/sai/oe-5.5m.html. 
  9. ↑ "Constitution". http://www.5.5class.org/rules/rules/constitution_5.5.pdf. 
  10. ↑ "World Championship Rules". http://www.5.5class.org/rules/rules/wc_rules_v08.pdf. 

External links




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