In their earlier publications on "the yaw balance of sailing yachts" (Keuning and Vermeulen, Ref [1] 2003) and "the mathematical model for the maneuvering of a sailing yacht" (De Ridder, Keuning and Vermeulen, Ref [2] 2005) an assessment method has been presented for determining the force distribution in yaw and sway over the hull, keel and rudder. In Ref [1] it was used to deal with the yaw balance of a sailing yacht on a straight course and in Ref [2] the similar approach was used to determine the necessary forces and moments on a maneuvering sailing yacht. In this assessment method use was made of what is called: the Extended Keel Method (EKM) as introduced by Gerritsma in 1971, Ref [3] for calculating the side force on the keel and rudder (and hull) of a sailing yacht.
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