CoAxe Aircraft Engine


The CoAxe Engine is an Internationally patented design (US Patent - 8,863,643 B2) representing a new approach to aviation and marine propulsion:

  • Perfect balance by design - including drive torque moments
  • 16% - 20% increase in propulsive efficiency - from contra-rotating props
  • Multiple fuels including Jet A - leaded AVGAS being phased out
  • Ultra low vibration - all opposing forces equal and opposite
  • Reduced weight, increased payload - no transmission required for coaxial drive
  • Competitive pricing - reduced moving parts and cost-effective manufacture
  • Improved fuel economy - opposed piston designs historically efficient
  • Reduced fire hazard - exhaust manifold 350 degrees C cooler
  • No electromagnetic interference - single throttle Diesel operation
  • Reduced noise - a result of opposed piston tangential porting

'aadiDefence is a not for profit company set up by an agreement between the Minister of Defence (Aust.) and the Victorian Government to assist companies with innovative defence-related technology to have:
  • their technology assessed
  • source expert advice to assist them in the development of their technology
  • advise on likely applications of their technology to Defence and/or defence prime contractors
  • assist them in marketing their technology to Defence and/or defence prime contractors

The CoAxe engine is an innovative design with novel features that in a mature design could offer significant advantages in particular applications, with light helicopters the first obvious application. As with all new engine developments it will require significant design and development effort to finalise a production design but aadiDefence can see no fundamental problems preventing such an engine demonstrating its unique and valuable features.

Dr Bill Schofield AM (Mech. Eng.)
Australian Aerospace and Defence Innovations (aadiDefence)

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