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A99 Inline Triple Liquid Cooled Engine (In Development)

A99 UAV EFI Engine System (Preliminary)

As of July 1, 2022 Power4flight will no longer be selling complete engine solutions. This product will now be available directly from our partners at Cobra Aero.
Please contact Cobra Aero for a product quote or more information.

System Overview (Preliminary)

The A99 Engine is currently under development. Its inline three-cylinder architecture is based off Cobra Aero’s A33 combustion system platform. It features precision liquid cooling, sequential multi-point fuel injection, tuned intake and exhaust, and a direct drive generator.

The Engine Package Includes:

  • Power4Flight IntelliJect ECU
  • Currawong self priming fuel pump and fuel pressure accumulator
  • All required EFI sensors and wire harnessing CHT, MAT, MAP, and fuel pressure
  • CDI module
  • Induction and exhaust system
  • Electric power generator with start capability
  • Cooling duct with active control
  • Isolation mount

  • Description
  • Additional information
Key Features
Specifications (Preliminary)
Documentation
  • High power to weight
  • Low acoustic signature
  • Cowls much tighter than typical boxer twin
  • 3D-printed aluminum head, cylinder, crankcase and exhaust improves engine repeatability
  • Hardware, electronics and software all designed specifically for UAS applications
  • Primary and secondary shaking forces are inherently balanced
  • Fires every 120 deg. Higher frequency torque impulses provide for relatively smooth operation
  • Separate crankcases for each cylinder for improved mixture control and decreased cycle-to-cycle variability
  • Ideal for spark ignited heavy fuel due to small cylinder bores and liquid cooling
Engine Type:Liquid-cooled 2-stroke inline triple
Displacement:99 cc (6.0 ci)
Mass:3.65 kg (8 lbs) (Includes core engine, exhaust, ECU, fuel pump, injectors, ignition, generator, harnesses)
Fuel Delivery:Fuel injection at 3 bar (gasoline 50:1 premix; (heavy fuel in development))
Power Output:6.0 kW (8.1 HP) at 8200 RPM
Fuel Consumption:500 g/kW-hr (0.82 lbs/HP-hr) at cruise
Generator output:400W (700W intermittent duty cycle)

A99 UAV Engine Datasheet

Additional information

Weight .53 kg

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Hood River, OR 97031
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