Romanenko E.V., Pushkov S.G.
Approximate expressions of hydrodynamic forces were used to develop a mathematical model of the flat rigid wing with different shape and aspect ratio varying pitch-axes location and sufficiently large heaving and pitching amplitudes. A peculiarity of this model is the usage of the first–order aerodynamic derivatives coefficients and kinematic parameters. Formulas for the calculation of the thrust and efficiency were derived. The results of calculations are in good agreement with numerical solutions.