Scaling Problem of Dynamic Motions in Waves From Model Tests of Surface Effect Ships and Air Cushion Vehicles

A description of the reasons for the unconservative lack of motion response scaling from model tests in waves of surface effect ships (and other air cushion vehicles) is given. The dominant influence of ambient atmospheric pressure is shown, with results considered in terms of both steady state and transient response characteristics. Special model test procedures that attempt to overcome this problem are discussed, together with a final recommended procedures for use in predicting full scale behavior.