The Technology

Mistral Engines has developed a line of multi-fuel, liquid-cooled, electronically controlled rotary engines.

Unprecedented combination of advantages allows Mistral Engines to meet current general aviation needs which very few engines manage. This makes Mistral Engines the choice for 21st century General Aviation.

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Benefits Design for You

Uncompromised safety & reliability • Reduced maintenance operations • Limited number of parts • Full redundancy • Liquid-cooled, elimination of thermal shock problems • Optimized comfort & performance • Turbine-like smoothness • Excellent power-to-weight ratio • Easy data tracking • Improved aerodynamics • Substantially decreased costs of ownership • TBO target of 3’000 hours • Fuel consumption electronically controlled • Low maintenance cost • Unmatched flexibility in fuelling options • Mogas and Avgas Reduced environmental impact • Unleaded gazoline

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FADEC The Brain of your Engine


  • Dual ignition and dual injection
  • Easy, dependable starts
  • Optimised engine settings in all flight phases
  • Reduced operating and maintenance costs
  • Increased overall operational safety

Mistral's FADEC system controls the electronic fuel injection and ignition systems. Its control algorithms are based on a single lever controlling engine power and on measurements of critical engine parameters such as engine speed and shaft position, manifold pressure and temperature, etc.
The system consists of two independent Engine Control Units. Each ECU is also constantly supervising the other. The two ECUs, as well as the pilot display and interface module, communicate via a CAN bus. In the unlikely event of a partial or complete failure of one of the ECUs, the other unit assumes full engine control and monitoring, and informs the pilot of the failure via both an alarm LED and a message on the display. In the event of an ECU failure, the maximum power is reduced to a level similar to a conventional engine operating on a single magneto.

PSRU Compact Planetary Gear

Planetary Reduction Gear for lower propeller speed on take-off (2,200 - 2,300 rpm) as well as in cruise (2,000 rpm and below).

  • Higher propulsion efficiency
  • Propeller noise reduced by 10 db or more

The PSRU (Propeller Speed Reduction Unit) is a heavy-duty 6-pinion planetary reduction gear with a ratio of 2.8235:1, resulting in lower propeller speed for reduced noise and improved efficiency. The gear train is designed to take the load of our three rotor turbocharged engines (360 hp) over a 3,000 hour Lifetime. By offering this same gearbox on our two rotors engines, we confirm the company’s policy to offer uncompromised reliability. High pressure oil from the engine block feeds both the gearbox lubrication system and the constant-speed hydraulic propeller governor.

Engine Block Pure Power

The sheer simplicity of the rotary engine block leads to its high reliability, longevity and low maintenance and overhaul costs. There are no valves, no pistons, no connecting rods, no camshaft…

The crankshaft is replaced by a much simpler and robust eccentric shaft, and the same power as some six-cylinder piston engines can be produced by a two rotor engine. This design has proven itself over many years of reliable service in diverse applications. In car racing, rotary engines are renowned for their dependability and piston engines are no match for them in endurance.
Contrary to reciprocating engines in which pistons brutally reverse direction thousands of times per minute, rotors only … rotate, with a slight eccentric movement. This results in incomparably smooth, vibration-free engine operations and great durability… turbine-like!

Rear Plate All you need

Mistral Engines’ rear plate provides options for either dynafocal or bed-type engine mounts and the drives for critical accessories such as the main alternator and vacuum or hydraulic pump. The coolant and oil pumps are integrated in the rear-plate.

All of Mistral Engines’ structural components have been computer analysed and tested with a powerful Finite-Element-Analysis software to ensure that they stand up to the most rigorous loading conditions that extreme flight manoeuvres can produce. All the results have been thoroughly verified during official structural tests. Manufacturing methods and non-destructive testing techniques are chosen and implemented to ensure the conformity, safety and integrity of each part. The engine can be equipped with single or dual alternators, and has two additional accessory drive pads which can be used for a hydraulic constant-speed propeller governor, vacuum pump, hydraulic pump or air-conditioning compressor.