Aircooled Wankel Genset

Integrated Lightweight Wankel-Based APU with 11kW Generator.

Ideal for electric multicopters.

Replacement for heavy batteries.

Key technologies

Highly effective for sustained operation at constant speeds. Built for airplane-type UAVs with high electrical loads and VTOLs.

  • Fuel System: In the RW79, we’ve incorporated an advanced electronic fuel injection system. The mixture is created through rotor injection and gains acceleration from centrifugal force before entering the combustion chamber. An e-supercharger, driven by a small turbine powered by an electric motor under precise ECU control, keeps the intake manifold at the optimal pressure for the prevailing conditions. Additionally, our proprietary ultrasonic fuel injectors, with variable duty cycles, ensure a consistent droplet size ranging from 2 to 5 nanometers across a broad spectrum of temperatures and altitudes.
  • With a continuous electrical power output of 11 kW, peaking at up to 16 kW, the RW79 provides a robust power source. Consumers can connect through a distribution controller featuring four independent groups, each with four channels, totaling 16 channels, all operating at 48V. These channels can be combined into groups of 96, 144, 192, or 384 volts, allowing for versatile power configurations. Each channel group offers independent control, a prioritized overload protection system, power balancing, and power limitation features, ensuring optimal performance and safety.
  • Cooling system: forced air. The air is sucked in and drawn through the electric coils of the generator stator, removing heat from it, then the centrifugal blades of the rotor are pushed at high speed through the channels and ribs on the engine housing. The throughput of the channels is selected to optimize heat removal from non-uniform heating specific to Wankels. Air is discharged from under the engine casing through a channel formed around the exhaust system, preventing it from heating the internal volume of the engine compartment and, mixing with the exhaust gases, reducing the IR visibility of the exhaust gases.
  • Materials and technologies: The engine casing is milled from dural alloy forging. The combustion chamber (stator) is formed from a thin cast-iron sleeve and cast-iron side walls to the reverse side of which labyrinth cooling channels are connected. The rotor is hollow, cooled by the fuel mixture, and made from an aluminum forging. Apex channels are electroplated. Seal apexes are tungsten carbide, and sidewalls are ground and anti-seize coated. The crankshaft and internal gears are forged steel. Bearings operate on polished and hardened surfaces. The outer surfaces of the engine are hard anodized and primed. All fasteners are stainless steel or titanium. All connectors are sealed, mil-spec.
Key technologies
Technical parameters
Engine type Wankel, Rotary hybrid.
Weight 5.2 kg
Displacement 79cc
Length/Width/Height 162x177x193 mm
Power 22 hp at 13000 rpm
Maximum Continuous Speed 13000 rpm
Ignition Electronic CDI. Twin spark plug. Variable ignition front
Cooling Forced Air
Fuel system Throttleless Two Stage Fuel Injection. eSupercharger
Fuel type Heavy fuel, Aviation kerosine JP1/JPA or Wide range of automotive and aviation gas
Specific Fuel Consumption (cruise) 240 – 260 g / kWh
TBO (estimate) 1000 hours
Preferred oil type API TC
Sensors / Telemetry EGT – Exhaust gas temperature; CHT – Cylinder head temperature; IAT – Intake air temperature; RPM – Rotation per mine; CSP – Crankshaft Position; KS – Knock sensor; Airflow, Fuel Flow
Control Ethernet, CAN 2.0B J1339/29bit; ADLM + TrueTorque
Electric System 14.4/28/48V Internal alternator / starter; Internal starter battery pack 5Ah
Electric output, Volts 48/96/144/192V
Output electric groups/channels 4/16

MSRP: 15500 Euro (FOB Barcelona)

We offer a “Developers Kit” – engine on a subframe suitable for mounting on a dyno, a set of radiators, pumps, a fuel system, an ECU and a wiring kit, with software control documentation (API, necessary source codes).

Shipping from Barcelona, Spain. Brutto 20kg,  0,7m3.  

UAVHE RW79 APUDownload
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