Sailboat fin rotatable about ballast support

摘要

A keel appendage comprising an elongated four-sided symmetrical diamond shaped ballast support member adapted to be fixed at its upper end to a canoe body in perpendicular relationship to the longitudinal axis of said canoe body, a ballast member fixed to the outer end of said ballast support member, the leasing and trailing edges of said ballast support member being pointed and disposed perpendicular to the longitudinal axis of said canoe body, a hollow hydrodynamic rotatable fin rigid from its leading edge to its trailing edge completely surrounding said ballast support member in rotatable sliding contact with such ballast support member whereby the undesirable dynamic drag of the ballast support member is eliminated when the canoe body is sailing.