7 Metre (keelboat)
| Current Specifications | |
|---|---|
|
120x50px Class Symbol | |
| Crew | 4 |
| LOA | 13 m (43 ft) |
| LWL | 8.5 m (28 ft) |
| Beam | 2.2 m (7 ft 3 in) |
| Draft | 1.9 m (6 ft 3 in) |
| Hull weight | 7,500 kg (17,000 lb) |
| Infobox last updated: 14-APR-2010 | |
| Former Olympic Class | |
The International Seven Metre Class is a construction class, meaning that the boats are not identical but are all designed to meet specific measurement formula, in this case International Rule. At their heyday, Metre Classes were the most important group of international yacht racing classes, and they are still actively raced around the world. "Seven" in class name does not, somewhat confusingly, refer to length of the boat, but product of the formula; 7mR boats are, on average, 13 meters long.
Contents
History
The 7mR was used as an Olympic Class during the 1908 and 1920 Olympics. The International Rule was set up in 1907 to replace earlier, simpler handicap system which were often local or at best, national, and often also fairly simple, producing extreme boats which were fast but lightly constructed and impractical. The rule changes several times in history. About 200 boats were ever build.
Rule development
1907 Rule
Used from 1907–1920
- <math>
7.000 \mbox{ metres} = \frac{L + B + 1/3G +3d + 1/3\sqrt{S} - F}{2} </math> where
- <math>L</math> = waterline length (LWL)
- <math>B</math> = beam
- <math>G</math> = chain girth
- <math>d</math> = difference between girth and chain
- <math>S</math> = sail area
- <math>F</math> = freeboard
1919 Rule
Used from 1920–1933.
- <math>
7.000 \mbox{ metres} = \frac{L + 0.25G +2d + \sqrt{S} - F}{2.5} </math> where
- <math>L</math> = waterline length (LWL)
- <math>G</math> = chain girth
- <math>d</math> = difference between girth and chain
- <math>S</math> = sail area
- <math>F</math> = freeboard
Olympic results
1908 (1907 rule)
Only one boat at the starting line.
| Rank | Country | Helmsman | Crew |
| 1 | [[File:Template:Country flag IOC alias GBR|22x20px|border|alt=|link=|Template:Country IOC alias GBR]] [[Template:Country IOC alias GBR at the 1908 Summer Olympics|Template:Country IOC alias GBR]] (GBR) | RIVETT-CARNAC, charles James | BINGLEY, Norman DIXON, Richard Travers RIVETT-CARNAC, Frances Clytie |
1920 (1919 rule)
This time two boats at the starting line.
| Rank | Country | Helmsman | Crew |
| 1 | [[File:Template:Country flag IOC alias GBR|22x20px|border|alt=|link=|Template:Country IOC alias GBR]] [[Template:Country IOC alias GBR at the 1920 Summer Olympics|Template:Country IOC alias GBR]] (GBR) | WRIGHT, Cyril Macey | WRIGHT, Dorothy Winifred COLEMAN, Robert Henry MADDISON, William J. |
| 2 | [[File:Template:Country flag IOC alias NOR|22x20px|border|alt=|link=|Template:Country IOC alias NOR]] [[Template:Country IOC alias NOR at the 1920 Summer Olympics|Template:Country IOC alias NOR]] (NOR) | Faye, Johan | DICK Christian ABEL Sten NEILSEN Niels |
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