Waterjet Propulsion System Performance in a Manned Testcraft in Calm Water.

An existing 14.5-ft manned testcraft was fitted with a fixed bow plate, fixed chine flaps, and adjustable transom flaps. Trials were conducted in a freshwater lake to evaluate the performance of its waterjet propulsion system which used a 14-in dia impeller. Propulsion shaft thrust. torque and rpm, waterjet velocity testcraft speed and running trim were recorded for a range of rpm up to full throttle of the 330 hp gasoline engine. Zero speed bollard pull runs were included. Test variables included three impellers, three flush inlet sizes, and three waterjet nozzle sizes. Keywords include Amphibian.