New Waterjet Propulsion Boat Low-poly 3D model

Waterjet propulsion is often choosen instead of conventional propellers for vessels requiring high speeds, shallow draught, protected propulsion, high manoeuvrability at all speeds, low noise emissions for military applications and low vibration.

A typical waterjet system includes a flush-mounted inlet channel guiding the water to the rotating pump impeller, a stationary guide vane package, an outlet nozzle and a steering/reversing mechanism. The basic operating principle of waterjet propulsion is similar to that of a screw propeller system. Namely the propelling force is generated by adding momentum to the water by accelerating a certain flow of water in an astern direction.

The water from under the vessel is fed through an inlet duct to a precision inboard pump, usually mounted at the transom, adding head to the water. This head is then applied to increase the velocity when the water passes through an outlet nozzle into the ambient atmospheric pressure.

The steering and reversing forces are generated by deflecting the jet by a flat-bucket gear which is normally hydraulically operated. For speeds above 30 knots waterjets are more efficient than conventional propellers, they also include benefits like improved manoeuvrability and radical reduction in the ship draught.