The Orbital UAV HFDI.75 is a two-stroke heavy-fuel propulsion system that has been designed with long endurance and mission reliability foremost in mind. Delivering 5.1 hp at just 7.8 kg in weight, it enables cleaner sensor data thanks to low levels of vibration, and has been proven in multiple active military deployments with over 700,000 operational flight hours worldwide.
The advanced propulsion system features Orbital’s FlexDI fuel injection technology, atomizing fuel to smaller droplets for a cleaner burn. FlexDI offers >30% lower cruise fuel use and high specific power, and also meets MIL-STD-1474D specifications for noise.
Featuring built-in ECU and PMU, pumps, wiring harness, engine mounts and propeller, the HFDI.75 enables plug-and-play integration into a variety of airframes. Cold starting is assured at temperatures of down to –30°C, and the engine can run on JP5, JP8, Jet A, Jet A1, or gasoline with no re-tuning.
Specifications:
| Weight: | ~7.8kg (includes ECU, mount, pumps, harness, propeller) |
| Power: | 5.1hp (3.8kW) @ 6500 RPM |
| Fuel Consumption (BSFC): | ~345 g/kWh @ typical cruise |
| Max Operating Altitude: | 20,000 ft AMSL |
| Operating Temperature: | -30 to 55 °C including start |
| TBO: | 500 hrs |
