The model to full scale correlation in resistance and powering between two scale model USMC waterjet propelled high speed amphibious vehicles is shown. The estimated required thrust for a 0.295 scale model of the High Water Speed Technology Demonstrator and a 0.245 scale model of the Propulsion System Demonstrator are compared to full scale results in a speed range of 5 to 30 knots. Correlation above 22 knots, after correction for air ingestion into the waterjets, is found to be excellent The effects of air ingestion into the waterjets, effect of long time constants to reach steady state, and an apparent hysteresis effect due to acceleration are also discussed.

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