The 10 Metre 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 built.

1907 Rule edit

Used from 1907 to 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 edit

Used from 1920 to 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

Olympics edit