On the skin friction and resulting wake of a two-dimensional planing plate |
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| Authors: | Peter R Payne |
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| Institution: | Payne Inc., 1933 Lincoln Drive, Annapolis, MD 21401, U.S.A. |
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| Abstract: | The skin friction of a two-dimensional planing flat plate is made up of two opposing components; a drag force from the flow aft of the stagnation line and an opposing thrust force from the jet flow. This paper is concerned only with the drag term and the wake velocity defect which it causes in the water behind the transom.It is concluded that the skin friction is less than would be expected from a flat plate at ambient static pressure (Dfo say) and is approximately equal to Dfo (1 ? CR), where CR is the normal force coefficient based on wetted area. The wake velocity decrement due to this drag is found to be significant, particularly for surface piercing propellers. |
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