ROTO 85 FS UAV

Twin-cylinder four-stroke engine, air-cooled, controlled by a CDI unit with a preset advance curve for smooth operation, designed for use in UAV projects. It is highly sought after for UAV, V-TOL, and Heli projects, where this engine is most commonly used due to its low weight, high performance, and very low fuel consumption. The Roto 85 FS UAV has a long lifespan, tested by dozens of successful projects. This engine is the most sought-after type in the UAV sector.

Performance Chart

The chart shows the performance of the ROTO35 UAV engine in relation to engine speed (RPM) and throttle position.

The horizontal axis indicates engine speed (3,500 to 6,000 RPM), and the vertical axis represents power output (1.0 to 1.5 kW).

The power output increases with RPM and is highest at wide open throttle (WOT). Lower throttle settings show increasing power up to a point, followed by a decrease or stabilization. This indicates optimal performance at higher RPMs and full throttle.

The graph details the relationship between engine revolutions per minute (RPM) and fuel consumption expressed in grams per hour (g/h). The data was measured using a 25/10 propeller and a carburetor fuel system.

RPM	g/h
6000	1170
5000	1152
4000	1062
3000	900
2000	675
1000	405

PROPERTIES

WEIGHT

Engine type
TBO
Capacity
Power
Cylinders
Configuration
Fuel metering unit
Ignition
Cooling
Lubrication
Speed
Height limit
Start generator
Generator
EPU
Regulator
Throttle control

ROTO 85 FS UAV
200 / 400 Hours if TBO is kept
79,5 ccm
4,8 kW
Two
Boxer

EFI ROTO / carburetor WALBRO
Electronic 4-14V
Air Cooled
Petrol 95/98 oct. + 2% oil
1200 – 6500 rpm
5000 metres above sea level
550W, 1300W
300W, 600W, 1000W
Start-generator
E-CON 130
Servo high-voltage

Engine weight

Ignition weight

Startgenerator

E-CON

Generator

EFI

2800g

190g

450g

150g

430 - 650g

100-250g

Performance and Efficiency

Throttle Control: High-voltage servo for precise throttle management
Sensors: Includes 2x CHT sensors, 2x EGT sensors, and 1x RPM Hall sensor for accurate monitoring and control
Starter Generator: Integrated starter generator ensures reliable engine starts and power management
EFI System: The advanced EFI system ensures optimal fuel injection and engine performance even at high altitudes and varying operational conditions

Advanced Telemetry and Control

Integrated Telemetry: Real-time monitoring of voltage, current, power, capacity, temperature, RPM, and energy usage
Safety Features: Over-voltage, under-voltage, over-temperature, and motor-stall protections
User Configuration: Adjustable parameters for current limiter, throttle input, acceleration, and more
Firmware Updates: Easily updatable firmware via USB interface

Installation and Maintenance

Mounting: The engine is designed for easy installation in UAV systems and includes options for customized setups
Propeller: Suitable for both carbon and wooden propellers, optimized for operation between5500 - 6000 RPM
Exhaust System: Features adjustable exhaust pipes for flexible installation and optimal performance
Fuel and Lubrication: Requires lead-free petrol mixed with 2% Stihl HP Ultra Oil for long-term engine operation. Ethanol content should not exceed 5% to avoid engine damage

UAV System

We will adapt to your UAV project and work with you to develop an engine that suits your requirements. The possibility of adjustments of the individual parts of the engine is our great advantage. Technical support throughout the development and operation of the power unit is a matter of course.