HamiltonJet HM Series
The HamiltonJet total waterjet solutions HamiltonJet has been providing waterjet propulsion solutions to the marine industry since the 1950s, and has installed more than 50,000 waterjets onvessels around the world. Through this experience HamiltonJet understands the wide range of conditions, situations and tasks a modern vessel needs to undertake on a daily basis throughout its operating life. Evidence of HamiltonJet’s success can be seen in the range of innovative designs the company has pioneered, each raising the standard of waterjet performance, control and lifecycle, all of which build on the HamiltonJet ethos of superior customer support.
As vessel speed increases waterjets become more efficient compared to conventional propeller systems. Efficiency benefits are due to:
• No appendage drag.
• Thrust generated by a waterjet is parallel to the direction of travel.
• Energy lost from flow rotation is recovered by the stator section of the waterjet.
Waterjet propulsion provides far superior manoeuvrability at both high and low speeds compared to a propeller boat as:
• Waterjet thrust is independent of boat speed.
• There is no need to change engine rotation to generate reverse thrust. A change from full forward thrust to full reverse thrust only requires the reverse duct to move from fully up to fully down position.
• There is sideways thrust capability with two or more jets without the need for a bow thruster.
Waterjets have no exposed high-speed moving components external to a vessel’s hull.
A waterjet is inherently more durable than conventional propeller propulsion as:
• No exposed appendages beneath the hull.
• The impeller is protected inside the body of the jet - propulsion gear and is not exposed to damage from floating debris or in the event of grounding.
• Maintenance can be predicted and planned in advance.
Waterjets offer significant advantages for vessels subject to variable loads as:
• Boat speed is determined by hull weight - when the vessel is running light it will travel faster or maintain service speed with reduced power input, resulting in fuel and time savings.
• Engines can not be overloaded when vessel is heavily laden - unlike propeller systems which can transfer load to the engine.
• Secondary propulsion option - waterjets can be used as boost or loiter propulsion alongside other waterjets propellers.