Rotax 503 UL DCDI 50HP Aircraft Engine

- 2-stroke engine specially developed for recreational aircraft
- 2 cylinders, cooled by fan
- Piston ported intake
- Dual capacitor discharge Ignition (DCDI)
- Dual Bing carburetors
- Mikuni pulse driven diaphragm fuel pump
- Recoil or electric starter
- Available with various exhaust system configurations
- Operates on automotive fuel with a minimum of 87 octane rating (Canadian standards) and super 2-stroke oil of API-TC classification, automatically provided by oil injection, or premixed with a 50:1 ratio
- Challenger owners, we make the installation of oil injection possible!
- Time Between Overhauls (TBO): 300 hours

Performance

Maximum power 49.6HP / 37.0kW
@6500 RPM

Maximum torque 41.3ft-lb / 56NM
@6000 RPM

Maximum RPM 6800 RPM

Combustion chambers

Bore 2.84″ / 72.0mm

Stroke 2.40″ / 61.0mm

Displacement 30.31cu.in. / 496.7cm³

Compression ratio Theoretical: 10.8
Effective: 6.2

Weight

Engine with carburetors 73.2lbs / 33.2Kg

Exhaust system 11.2lbs / 5.1Kg

Air filter 1.1lbs / 0.5Kg

No gearbox, no electric starter 85.5lbs / 38.8Kg

B gearbox,
no electric starter 95.4lbs / 43.3Kg

B gearbox,
electric starter 106.2lbs / 48.2Kg

C gearbox,
no electric starter 103.1lbs / 46.8Kg

C gearbox,
electric starter 113.9lbs / 51.7Kg

E gearbox 110.2lbs / 50.0Kg