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Integrated propeller/rudder

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The AWJ-21 is being tested on Sea Jet the ‘advanced electric ship demonstrator’ (AESD) funded by the US Office of Naval Research
Courtesy of US Navy

Advanced waterjets

The advanced waterjet AWJ-21 is an underwater discharge waterjet designed to reduce ship signatures and at the same time deliver high efficiencies. Its layout also enables the designer to eliminate rudder and waterbourne shafting. Units are protected from grounding by the pump nacelle.


Side illustration of the AWJ-21 waterjet showing how the unit is mounted beneath the waterline

Features and benefits

  • Greatly improved cavitation characteristics
  • High efficiency over broad operating range
  • Shock hardened component design
  • Single hull penetration for steering and reversing system
  • Drive-train flexibility

Testing in the US Navy’s 40metre AESD will optimise and validate AWJ-21 pump performance and to determine power, manoeuvring, hydrodynamic and hydro-acoustic performance. It is expected to provide a stealthy, more compact propulsion system with reduced weight and volume. Ideal for operating in shallow waters.

Typical applications

Sea Jet: ‘Advanced electric ship demonstrator’ (AESD)




pdf icon AWJ-21 waterjet fact sheet 66kb

pdf icon Ship demonstrator tests new waterjet technology 82kb



For more information see the Waterjets product section »


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