Separation of Resistance Components of Prismatic Planing Hull Forms

Abstract

The present report describes results of wave pattern resistance measurement for two models of prismatic planing hull forms. The resistance is analysed by Newman-Sharma's method. Discussion is also made on the separation of resistance components of the models, using the results of previous experiments, which were 3-component-force test, measurement of bottom pressure distribution, measurement of spray flux distribution, and the present measurement of wave-pattern resistance. An attempt of the separation of resistance components has resulted : (1) Frictional resistance due to Shoenherr's formula for an equivalent flat plate, added to the pressure obtained by integrating the measured hull pressure, turns out to be almost equal to the measured value of the total resistance. (2) The pressure resistance can be resolved into two components, i.e., the spray resistance which is derived from the measured momentum loss, and the wave pattern resistance which is also measured by removing the spray. It is found that the frictional resistance, the spray resistance and the wave-pattern resistance are almost of the same order, any of which may not be neglected.