The UAV-85 engine based on the Fiala PROP. company FM 85 – B2 - FS engine is a 4-stroke gasoline motor with volume 85 ccm designed for being integrated in UAV.
It is a 4-stroke motor with OHV and 2 valves per cylinder. The engine is equipped with a microprocessor ignition for easy starting and smooth running in all modes of engine speed.
The engine has been modified by UAVOS to improve performance :
— Air cooling and a two-nozzle fuel injection system have been made.
— A brushless generator-starter is installed on the engine.
UAVOS's injection system can be very precisely tuned with a lambda probe depending on the operating conditions.
The engine is equipped with a fuel
95-octane petrol + Valvoline 2T
Maximum engine power: 5.5 HP (4 kW)
Nominal engine power: 4.2 HP (3 kW)
Fuel consumption: 320 g/kWh
Equipped with starter-generator,
27V 3-phase AC motor. Generator power
200W up to 4800 rpm
Total engine weight with ECU (engine
control unit): 5.5 kg
Maximum CHT operating temperature:
Power to Torque relationship plot (OAT 15 °C, Atm.pressure 1013 mbar).
Engine Control Unit
Engine is equipped with Engine Control Unit (ECU) UV01.6401.06.63.00.
This unit is intended for processing information from sensors:
— calculates the optimal amount of the fuel input;
— determines the moment of ignition (based on the operating conditions of the engine and its mode).
The unit is equipped with a digital data line, which allows the flight controller to transmit sensor readings, as well as receive ignition commands and gas levels.
The main functions of the Engine Control Unit (ECU) UV01.6401.06.63.00:
— adjustment of the amount of fuel input;
— ignition timing adjustment;
— power supply control of the fuel pump;
— temperature measurements EGTх2, CHTх2, AT;
— the formation of control pulses of the gas servo drive;
— data exchange with a software navigation system.
Electrical characteristics of the engine control unit