During the Winter of 1994 and Spring of 1995, a series of experiments for determining the effects of various parameters on the calm water resistance of a planing boat were conducted at the United States Naval Academy Hydromechanics Laboratory. For all of the tests discussed in this paper the model was ballasted to the same loading condition and towed with the same equipment. The differences that were investigated involved details of model testing that are usually left to the discretion of the institution performing the tests. Some of the differences were found to have profound effects on the resistance and trim that were measured. This paper will describe the test facilities, the model and parameters that were varied, and make some general conclusions and observations regarding the effects of each of the test parameters. The results will also be compared with accepted numerical prediction methods. (The particular method used for this paper is from "Hydrodynamic Design of Planing Hulls" by Daniel Savitsky [1] with modifications by Jacques Hadler [2] .)

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