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Abstract
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In this paper, an attempt has been made to predict the performance of a planing catamaran using a mathematical model.
Catamarans subjected to a common hydrodynamic lift, have an extra lift between the two asymmetric half bodies. In
order to develop a mathematical model for performance prediction of planing catamarans, existing formulas for
hydrodynamic lift calculation must be modified. Existing empirical and semi-empirical equations in the literature have
been implemented and compared against available experimental data. Evaluation of lift in comparison with experimental
data has been documented. Parameters influencing the interaction between demi-hulls and separation effects have been
analyzed. The mathematical model for planing catamarans has been developed based on Savitsky’s method and results
have been compared against experimental data. Finally, the effects of variation in hull geometry such as deadrise angle
and distance between two half bodies on equilibrium trim angle, resistance and wetted surface have been examined.
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