Rotax 503
| BRP-Rotax | |
|---|---|
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|
| Rotax 503 | |
| Production period: | until 2011 |
| Manufacturer: | BRP-Rotax |
| Working principle: | Otto |
| Motor design: | In-line engine |
| Drilling: | 72 mm |
| Hub: | 61 mm |
| Displacement: | 496.7 cm 3 |
| Mixture preparation: | Carburetor |
| Engine charging: | - |
| Cooling system: | Air cooling |
| Power: | 34 kW |
| Torque: | 37.6 Nm |
| Dimensions: | 37.6 kg |
| Previous model: | Rotax 377 |
| Successor: | none |
The Rotax 503 is one of a range of small piston engines designed primarily for aerospace applications. It was manufactured and sold by the Austrian manufacturer Rotax until 2011 . Spare parts have been supplied since then.
It is a 2-cylinder two-stroke engine equipped with a fan , which is suitable for both a pull- screw and a pneumatic screw . Forced cooling by the fan can be dispensed with if the motor drives a tension screw and air ducts and baffles ensure that the ram air is cooled. The engine is approved for experimental and UL aircraft. It has a double electrical ignition system and can be supplied with one (model 503 UL-1V) or two (model 503 UL-2V) carburettors. Various speed ratios are also available for the reduction gear.
Additional equipment options include an electric starter , alternator and silencer .
Technical specifications
| Parameter | 503 UL-1V | 503 UL-2V |
|---|---|---|
| Power kW | 34 at 6500 rpm | 37 at 6500 rpm |
| Torque Nm | 37.6 at 5900 rpm | 41.3 at 6000 rpm |
| Maximum speed | 6800 rpm | 6800 rpm |
| Bore mm | 72 | 72 |
| Stroke mm | 61 | 61 |
| Cubic capacity cm³ | 496.7 | 496.7 |
| compression | 10.8: 1 | 10.8: 1 |
| Weight (without gear) kg |
37.6 | 38.8 |
| Width (mm | 513 | 513 |
| Height mm (depending on the gear) |
374/426 | 374/426 |
| Length mm (depending on the gear) |
556/564 | 556/564 |
| Specific consumption g / kWh | 510 | 500 |
