▁are ▁commonly ▁ 3 0 0 HP ▁and ▁In boards ▁around ▁ 1 , 3 0 0 HP . ▁ ▁Australia ▁is ▁the ▁identified ▁home ▁of ▁ski ▁racing , ▁being ▁responsible ▁for ▁some ▁of ▁the ▁world ' s ▁biggest ▁races , ▁including ▁the ▁world ' s ▁fast est ▁races , ▁as ▁well ▁as ▁a ▁history ▁of ▁the ▁majority ▁of ▁sk ier ▁world ▁champion ships . ▁ ▁Current ▁format ▁world ▁championship ▁racing ▁involves ▁men ' s ▁and ▁women ' s ▁formula ▁ 1 ▁races ▁( un rest rict ed ), ▁and ▁men ' s ▁and ▁women ▁formula ▁ 2 ▁races ▁( limited ▁to ▁single ▁rig , ▁ 3 0 0   hp ▁out boards , ▁as ▁well ▁as ▁junior ▁classes ▁for ▁under ▁ 1 6 ' s . ▁ ▁Some ▁of ▁the ▁biggest ▁races ▁in ▁the ▁world ▁include ▁the ▁Southern ▁ 8 0 , ▁in ▁E ch uca , ▁Victoria , ▁Australia , ▁the ▁diam ond ▁race , ▁in ▁Belg ium , ▁the ▁Catal ina ▁ski ▁race , ▁in ▁Long ▁Beach , ▁USA , ▁and ▁the ▁Sydney ▁Bridge ▁to ▁Bridge ▁in ▁Sydney , ▁Australia . ▁R aces ▁can ▁have ▁anywhere ▁from ▁ 1 0 ▁boats ▁to ▁ 1 5 0 ▁boats ▁( in ▁classes ) ▁compet ing . ▁ ▁Mar athon ▁The ▁mar athon ▁event ▁consists ▁of ▁each ▁sk ier ▁having ▁to ▁ski ▁on ▁all ▁ 6 ▁pieces ▁of ▁equipment . ▁ ▁– ▁Single ▁ski , ▁Double ▁sk is , ▁Single , ▁Single ▁fin less , ▁Double ▁fin less , ▁a ▁fre eb o