The effect of surge, added mass, and unsteady lift on the motion of a hydrofoil boat in a seaway¹

Article type: Research Article

Authors: Leopold, Reuven

Affiliations: Massachusetts Institute of Technology, Department of Naval Architecture and Marine Engineering

Note: [1] This research carried out under the Office of Naval Research Contract NO. NONR 1841(71).

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.

DOI: 10.3233/ISP-1964-1112001

Journal: International Shipbuilding Progress, vol. 11, no. 120, pp. 335-357, 1964