This study addresses Hydrodynamic interaction of two planning surfaces in the two dimensional, inviscid, steady flow approximation. The velocity potential is found by disturbing hydrodynamic sources on the horizontal plane and satisfying linearized boundary conditions for the water flow at finite Froude numbers. Hydrodynamic characteristics of tandem planning plates, including lift coefficients, centers of pressure, lift-drag ratios and wetted lengths, are determined as functions of the spacing between the plates and compared to properties of a single planning surface. The water surface elevations and the pressure coefficient distributions are presented for several cases. Obtained results can be used as initial guidance for selecting optimal configurations of stepped hulls and fast multi-hulls and fast multi-hulls and predicting hydrodynamic interaction between planning boats moving in tandem arrangement.

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