Abstract
Due to the large quantity of computations involved in solving the equations of motion of a hydrofoil craft in a seaway, various simplified methods have been used in the past. Most of the methods following aircraft motions analyses were neglecting surge and added mass. It is shown in this paper that surge has a large effect on the heave and pitch motions while added mass and unsteady lift do not have significant effect.
Furthermore, it is shown that a boat with fully submerged foils can, in fact, be controlled through regular and irregular waves in both ahead and following seas. A computer program enabling very rapid evaluation of the motions through various sea conditions was prepared for IBM 7090 computer and the results were displayed on the television scope attached to the computer. Reproductions of the results are presented.
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