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Water Jets


  • EfficiencyAs 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. ManoeuvrabilityWaterjet 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. SafetyWaterjets have no exposed high-speed moving components external to a vessel’s hull. DurabilityA 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. FlexibilityWaterjets 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.

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