Impact Loads on Warped Planing Surfaces Landing on Smooth and Rough Water.

摘要

The impact of planing surfaces on waves is analyzed according to an extension of the theory for smooth-water impacts in a way that takes account of the influence of wave kinematics. Impacts of the type incurred by seaplanes,in which the weight of the craft is sustained by wing lift,are studied. Data for planing,which is a special case of impact,are used to obtain the needed relationship between virtual mass and hull geometry. Impact tests with two models having different amounts of warp,or longitudinal variation of deadrise,are compared with theoretical calculations. Observations are made concerning the influence of trim, deadrise,beam loading,glide path,warp rate and waves on the initial stages of the impact,when the vertical velocity is practically uniform,on the basis of the derived differential equation of motion. (Author)