The unsteady lifting surface theory has been utilized in the study of the hydrodynamic interaction of a propeller and enshrouding nozzle when both lifting surfaces are immersed in a non-uniform inf low field (hull wake). The actual geometry of propeller and enshrouding duct, including their thicknesses, camber distributions and the conicity angle of the duct are taken into account. A numerical ana lysis and corresponding computer program have also been developed, adaptable to a high-speed digital computer furnishing information about the steady and time-dependent pressure (loading) distributions on both lifting surfaces and the resulting hydrodynamic forces and moments generated by this propulsive device.

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