# How does marine jet propulsion work

Jump to: Manoeuvrability at low speeds and acceleration to high speeds are superior. No central deadband provides higher course-keeping efficiency and higher overall boat speeds. The original development of this principle can be traced back to 1661, when Toogood and Hayes produced a description of a ship having a central water channel in which either a plunger or centrifugal pump was installed to provide the propulsion. This page has been accessed 14,820 times.

## WaterJet Overview

Search form Search this site. This reverses the direction of the force generated by the jet stream, forward and down, to keep the boat stationary or propel it in the astern direction. HamiltonJet's experience is supported by accurate performance prediction software to ensure waterjets are an appropriate propulsion option for your vessel, and to recommend the most appropriate waterjet size and set up for every different application.

This page was last modified on 9 December 2010, at 03: It works in relation to Newton's Third Law of Motion - "every action has an equal and opposite reaction". Namespaces Page Discussion.

WaterJet Overview. These advantages include:.

These include... HamiltonJet waterjets have fewer moving parts and most major components inboard, minimizing the chance accidental damage and increasing the life of components. Retrieved from " http: The unit's thrust is mainly generated by momentum increase given in the water.

The picture below shows where water enters the jet unit via the Intake A. Steering is achieved by changing the direction of the stream of water as it leaves the jet unit.

## Waterjet propulsion

Navigation menu Personal tools Log in. Pointing the jet stream one way forces the stern of the boat in the opposite direction which puts the vessel into a turn. Waterjet propulsion has many advantages over other forms of marine propulsion, such as stern drives, outboard motors, shafted propellers and surface drives. In a boat hull the jet unit is mounted inboard in the aft section. Reverse is achieved by lowering an astern deflector E into the jetstream after it leaves the nozzle.

This high pressure flow is discharged at the nozzle D as a high velocity jet stream.

Water enters the jet unit intake on the bottom of the boat, at boat speed, and is accelerated through the jet unit and discharged through the transom at a high velocity. The picture below shows where water enters the jet unit via the Intake A.