# 10 Metre

(Redirected from 10 Metre (keelboat))
Development Class symbol Development class 8 2.2 m (7 ft 3 in) 12,000 kg (26,000 lb) 16.5 m (54 ft) 11 m (36 ft) 3 m (9.8 ft) Former Olympic class

The International Ten 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. "Ten" in class name does not, somewhat confusingly, refer to length of the boat, but product of the formula; 10mR boats are, on average, 16.5 meters long.

## History

The 10mR was used as an Olympic Class during the 1912 and 1920 Olympics.[1] 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 20 boats were ever build.

## Rule development

### 1907 Rule

Used from 1907–1920

${\displaystyle 10.000{\mbox{ metres}}={\frac {L+B+1/3G+3d+1/3{\sqrt {S}}-F}{2}}}$

where

• ${\displaystyle L}$ = waterline length (LWL)
• ${\displaystyle B}$ = beam
• ${\displaystyle G}$ = chain girth
• ${\displaystyle d}$ = difference between girth and chain
• ${\displaystyle S}$ = sail area
• ${\displaystyle F}$ = freeboard

### 1919 Rule

Used from 1920–1933

${\displaystyle 10.000{\mbox{ metres}}={\frac {L+0.25G+2d+{\sqrt {S}}-F}{2.5}}}$

where

• ${\displaystyle L}$ = waterline length (LWL)
• ${\displaystyle G}$ = chain girth
• ${\displaystyle d}$ = difference between girth and chain
• ${\displaystyle S}$ = sail area
• ${\displaystyle F}$ = freeboard

## Events

### Olympics

Event Gold Silver Bronze
1912 Stockholm
details
Sweden (SWE)
Filip Ericsson
Carl Hellström
Paul Isberg
Humbert Lundén
Herman Nyberg
Harry Rosenswärd
Erik Wallerius
Harald Wallin
Finland (FIN)
Harry Wahl
Waldemar Björkstén
Jacob Björnström
Bror Brenner
Allan Franck
Erik Lindh
Juho Aarne Pekkalainen
Russia (RUS)
Esper Beloselsky
Ernest Brasche
Karl Lindholm
Nikolay Pushnitsky
Aleksandr Rodionov
Iosif Shomaker
Philipp Strauch
1920 Antwerp
1907 rule
details
Norway (NOR)
Erik Herseth
Gunnar Jamvold
Petter Jamvold
Claus Juell
Sigurd Holter
Ingar Nielsen
Ole Sørensen
No further competitors No further competitors
1920 Antwerp
1919 rule
details
Norway (NOR)
Charles Arentz
Otto Falkenberg
Robert Giertsen
Willy Gilbert
Halfdan Schjött
Trygve Schjøtt
Arne Sejersted
No further competitors No further competitors

## References

1. ^ Klawiński, George. "Yachts unusual: PESA". Zagle. Retrieved June 3, 2016.