Rotary Engine
• Type
Power systems for Unmanned Aerial Vehicles
• Development
NCSIST has been developing the rotary engine since 2010. The tests of 34hp RU200 and 42hp RU260
rotary engines were successfully conducted in 2011 and 2014. The first flight test was made in 2015.
In civil and industrial applications, NCSIST will develop a variety of rotary engines for auxiliary power
systems of an aircraft, power plants of light sport vehicles, powered paraglider, and range extender
engines of electric vehicles.
• Description
The rotary engine is primarily used as power systems for unmanned vehicle systems and has the
benefits of double higher power output and better fuel consumption than those of 2 stroke engines.
By taking advantage of electrical fuel injection systems, which control the air-fuel ratio, and precise
ignition timing of twin sparks, rotary engine provides higher power output and better fuel
consumption.
The idle speed control (ISC) design is capable of making rotary engine to operate more smoothly at
idle and perform air and fuel compensation during cold starts. In addition, the rotary engine gives the
optimal power output and fuel consumption by the control of the air-fuel ratio at a variety of flight
altitudes.
There are two types of rotary engine, RU200 & RU260, which are characterized by light weight, high
power output, and innovative cooling solution design which makes the UAV maintain a desired flight
condition.
• Specifications
Engine Type
|
RU200
|
RU260
|
Fuel Type
|
Unleaded (95 Octane)
|
Unleaded (95 Octane)
|
Swept Volume(cc)
|
207
|
260
|
Dry Weight(exclude generator) (kg)
|
10.4
|
13.7
|
Cooling
|
Air cooled
|
Air cooled
|
Performance
|
|
|
Power (hp/rpm)
|
34 / 7600
|
42 / 7600
|
Torque (N.m/rpm)
|
32 / 6000
|
39 / 6000
|
bsfc (lbf/bhp/hr) at 6000rpm
|
0.56
|
0.58
|
Operating Environment
|
|
|
Ambient Temperature(℃)
|
-30° to +50°
|
-30° to +50°
|
Altitude
|
>6,000m
|
>6,000m
|
Generator
|
1.2kW 28V Alternator Integrated
|
1.2kW 28V Alternator Integrated
|
Other Features
|
‧ECU controlled
‧Fuel injection
‧Twin spark ignition
|
‧ECU controlled
‧Fuel injection
‧Twin spark ignition
|
• Status
The performance tests of rotary engines RU200 and RU260 have been completed. Furthermore, the
engine RU200 was installed in the indigenous UAV, which was developed by NCSIST, and
demonstrated in the flight test. The endurance tests of rotary engines are being conducted.