Our Engines

2.5 HP: Oval Engine OE-20A

The Oval Engine OE-20A Rotary engine, designed in 2013, has been developed from a clean sheet to run with multiple fuels including Gasoline, JP-8, JP-5 & Jet-A1 alongside the other engines in our engine suite.

Ultra light-weight, low vibration and high power density are the key properties of this engine.

Technical Specifications:

  • Engine Type: Single Rotor Rotary, Air Cooled.
  • Rated Power: 2.3HP Max. 1.7HP Continuous.
  • Weight (Core Engine)*: 2kg/2.64 lbs with steel housing, 0.9kg/1.98lbs with aluminium housing
  • Fuel Consumption: Design Target:0.75lb/BHP/hr, Tested Capability to date:0.95lb/BHP/hr
  • Heavy Fuel Starting: 100W required for 10s in Standard Day Sea Level conditions
  • Start Load with Oval Engine Starter: 5s crank time, 14A at 28V
  • Oil System: Independent ECU managed system
  • Fuel / Ignition System: Electronic fuel injection with altitude compensation. Closed loop fuelling and automatic fly-by-wire throttle control via can-bus.
  • Durability: The OE-20 engine has so far completed 100 hour of durability testing. The OE-20 has been designed using the same core engine technology used across our engine suite, durability estimate will be 250 hours @ 75% Load Factor and 1500+ hours @ 60% Load Factor.
  • Vibration: Reciprocating = Zero, Torsional = 25% of equivalent piston engine.
  • Core Dimensions, (L X Diameter): (123mm x 98mm)/(4.84 x 3.85 inches).

*Core Engine weight does NOT include induction, exhaust, generator, starter.

15-18HP: Oval Engine OE-92L

The OE-92L Rotary engine, designed in 2009, has been developed from a clean sheet to run with multiple fuels including Gasoline, JP-8, JP-5 & Jet-A1, alongside the other engines in our engine suite.

Ultra light-weight, low vibration and high power density are the key properties of this engine. Our lightweight liquid cooling solution is our prime offering for this engine, an air cooled version is under development.

Technical Specifications:

  • Engine Type: Single Rotor Rotary, Liquid Cooled.
  • Rated Power (JP-8 Fuel): Design Target:15BHP, Tested Capability to date:18 BHP
  • Core Engine Weight*: 3.5kg/7.7lbs (3.0kg/7.2lbs to special order)
  • Fuel Consumption: Design Target:0.7lb/BHP/hr, Tested Capability to date:0.6lb/BHP/hr
  • Heavy Fuel Starting: 200W required for 40s in Standard Day Sea Level conditions
  • Engine Cranking For Start: 5s crank time, 60A peak at 28V
  • Oil System: Independent ECU managed system
  • Fuel / Ignition System: Electronic fuel injection with altitude compensation. Closed loop fuelling and automatic fly-by-wire throttle control via can-bus.
  • Durability: 400 hours Time Between Overhaul (TBO) @ 75% Load Factor,1500+ hours Time Between Overhaul (TBO) @ 60% Load Factor.
  • Vibration: Reciprocating = Zero, Torsional = 25% of equivalent piston engine.
  • Core Dimensions, (L X Diameter): (200mm x 160mm)/(7.87 x 6.29 inches)

*Core Engine weight does NOT include induction, exhaust, generator, starter.