DURABILITY A waterjet is inherently more durable than conventional propeller propulsion: No exposed appendages beneath the hull - allows the vessel to access shallow waterways, cross sandbars and reefs, and complete beach landings and launches. The impeller is protected inside the body of the jet - propulsion gear is not exposed to damage from floating debris or in the event of grounding. Maintenance can be predicted and planned in advance - with propeller systems there is always uncertainly as exposed propulsion gear could be damaged at any time. Waterjets reduce downtime for vessel maintenance and can mean fewer vessels are required in a fleet.
FLEXIBILITY Waterjet offer significant advantages for vessels subject to variable loads: 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, a waterjet will always match available engine power. This results in less engine wear and consequently less maintenance and longer engine life. Secondary propulsion option - AWT waterjets can be used as boost or loiter propulsion alongside other waterjets or propellers.
EFFFICIENCY As vessel speed increases waterjets become more efficient compared to conventional propeller systems. Efficiency benefits are due to: No appendage drag - the waterjet intake sits flush with the hull bottom without struts, propeller shafts, rudders or any elements protruding beneath the hull to increase hull resistance, particularly as speed increases. Thrust generated by a waterjet is parallel to the direction of travel. For many propeller system the shaft is angled down and thrust is generated in the direction of the shaft, so only a component of the total thrust is in the direction of travel. Energy lost from flow rotation is recovered by the stator section of the waterjet. This is energy that is lost in a propeller installation.
MANOEUVRABILITY Waterjet propulsion providers far superior manoeuvrability at both high and low speeds compared to a propeller boat: Waterjet thrust is independent of boat speed - thrust is determined by input power and astern deflector position and is available at all times, even at zero speed. Result - boat can be turned without moving ahead or astern, and the ability to move the reverse deflector slightly either side of the zero speed position also provides very fine ahead or astern control, all while maintaining full steering control. 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. Sideways thrust capability with two or more jests (with split duct reverse deflectors) without the need for a bow thruster.
SAFETY Waterjets have no exposed high-speed moving components external to vessel’s hull, providing greater safety to people in the water and marine life, and allowing the propulsor to keep running when operation in such conditions. There is also less risk to equipment in the water.
PERFORMANCE High speed performance and efficiency - Advanced impeller and intake designs provide high efficiency and performance over a wide speed range. Low speed performance - high thrust at low speeds ensures excellent station-keeping bollard pull, load carrying and manoeuvring. Acceleration - ability to apply full power at lower speeds ensures fast acceleration for patrol boats, rescue craft, pilot boats and recreational vessels.
CONTROL Steering control - AWT jets steering system has high performance, reducing thrust losses when steering to give tighter turns and maintain vessel speed during the turn. Ahead / Astern control - AWT jet’s split duct reverse deflector provides up to 50% of forward thrust, resulting in highly responsive control at slow boat speeds where engine is set to higher than idle RPM and the reverse duct is used to regulate forward and aft thrust. Speed of the control response - AWT jet controls respond quickly to skipper input to improve manoeuvring control and safety. The company develops hydraulic and electronic control systems to maximise control benefits of its waterjets.
SUPPORT International Support - AWT-JET service provide immediate assistance through network around the globe and offer fast spare parts supply.
LIFECYCLE Material specifications - all AWT jets are manufactured using high quality materials to ensure the best mix of durability, weight, corrosion resistance and cost. Impeller rating accuracy - Impellers are cast as a single piece to ensure more accurate ratings for all impellers and a better match to peak engine rating. Application engineering - AWT jets provides high level of technical expertise and advice to builders, designers and end users throughout the entire vessel design, build and commissioning phases, and for the operational life of a vessel. Integrated Engineering - Each AWT jet is a complete packaged, factory tested, propulsion module, with reverse and steering control systems fully integrated with the jet to simplify installation and maintenance.
After years of use and improvement, our waterejet has excellent performance and can meet customer needs.