4564 “Improvement of Sailing Yacht Performance Prediction by Including Force-Moment Equilibrium for the Calculation of Helm Angle in a Velocity Prediction Program”

“Improvement of Sailing Yacht Performance Prediction by Including Force-Moment Equilibrium for the Calculation of Helm Angle in a Velocity Prediction Program”, by Peter van Oossanen, Published in the Proceedings of the 12th Chesapeake Sailing Yacht Symposium, Annapolis, USA, January 1995, pp. 145-155 (ID No. 4564).

This paper addresses the improvement in accuracy obtained in predicting the performance of sailing yachts when a fourth equilibrium condition is added to the calculation process of a Velocity Prediction Program (VPP). The paper addresses the added complexity of this fourth condition which requires that the angle of attack of appendages that rotate about a vertical axis (when the yacht is upright) be determined from this equilibrium condition – for example, the helm angle when this only entails a rudder.

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