A new method for the optimisation and design of Contra-Rotating Propellers (CRP) is presented in this paper. It is based on a Genetic Algorithm (GA) applied to a Vortex Lattice Method, used to compute the optimum spanwise distribution of circulation. chord length and thickness. Computation of the pitch and camber distribution is then performed with a design Panel Method (DPM). Both codes are used in a loop of iterations in order to take into account of the reciprocal interaction of the two propellers and their wakes. Blade optimisation is performed within several constraints such as cavitation avoidance and structural strength requirements.

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