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An assessment of the relative speeds and payload capacities of airborne and waterborne vehicles accentuates a gap that can be usefully filled by a new vehicle concept, making use of both hydrodynamic and aerodynamic forces. A high speed marine vehicle equipped with aerodynamic surfaces (called an AAMV, 'aerodynamically alleviated marine vehicle') is one such concept. There are three major modes of motion in the operation of an AAMV including take-off, cruising and landing. However, during take-off, hydrodynamic and aerodynamic problems of an AAMV interact with each other in a coupled manner, which make the evaluation of this phase much more difficult. In this article, at first aerodynamic characteristics such as lift and drag coefficients, were calculated, using theoretical relations in extreme ground effect, and then a relationship was made between total aerodynamic lift force and effective weight force in the hydrodynamic performance. Then, taking into account the aerodynamic, hydrostatic and hydrodynamic forces acting on the AAMV, equations of equilibrium were derived and solved. The developed method was well-validated against experimental data, and finally, influence of different hydrodynamic and aerodynamic parameters on the performance of the AAMV was investigated. Time-and costsaving in the preliminary design stage of an AAMV are some of the superiorities of the developed method over the numerical and experimental approaches.

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