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Abstract: The paper describes a hybrid calculation concept for marine propulsors consisting of two consecutive calculation steps. The first step is based on a lifting line approach and it delivers the exact location of the free vortex sheets in the propeller slipstream. The geometry of the free vortex system which may include interaction effects in case of multi component propulsors is then transferred into a boundary element method for the final calculation of the integral values such as thrust and torque. This procedure avoids the numerical iteration of the free vortex system’s location during the boundary element computation. This does not only save computational time, but it also extends the application possibility of the boundary element method for low advance coefficients and complex multi component propulsors.