content_image/527026.jpg content_image/527025.jpg
engine, the oil and fuel must be mixed in the fuel tank on some models. Other models use a lubrication system, such as the 503 oil injection lubrication system. This system does not mix the fuel and oil as the oil is stored in a separate tank. As the engine needs lubrication, the oil is injected directly from this tank. The typical ignition system is a breakerless ignition system with a dual ignition system used on the 503, and a single ignition system used on the 447 engine series. Both systems are of a magneto capacitor discharge design. 

The engine is equipped with a carburetion system with one or two piston-type carburetors. One pneumatic driven fuel pump delivers the fuel to the carburetors. The propeller is driven via a flange connected gearbox with an incorporated shock absorber. The exhaust system collects the exhaust gases and directs them overboard. These engines come with an integrated alternating current (AC) generator (12V 170W) with external rectifier-regulator as an optional extra. 

## Rotax 582 UL DCDI 

The Rotax 582 is a two-stroke engine, two cylinder inline with rotary valve inlet, has liquid cooled cylinder heads and cylinders that use an integrated water pump.  [Figure 11-3] The lubrication system can be a fuel/oil mixture or oil injection lubrication. The ignition system is a dual ignition using a breakerless magneto capacitor discharge design. Dual piston type carburetors and a pneumatic fuel pump deliver the fuel to the cylinders. The propeller is driven via the prop flange connected gearbox with an incorporated torsional vibration shock absorber. This engine also uses a standard version exhaust system with an electric starter or manual rewind starter. 

## Description of Systems for Two-Stroke Engines 

## Cooling System of Rotax 447 UL SCDI and Rotax 503 UL DCDI 

Two versions of air cooling are available for these engines. The first method is free air cooling, which is a process of engine cooling by an air-stream generated by aircraft speed and propeller. The second is fan cooling, which is cooling by an air-stream generated by a fan permanently driven from the crankshaft via a V-belt. 

## Cooling System of the Rotax 582 UL DCDI 

Engine cooling for the Rotax 582 is accomplished by liquid cooled cylinders and cylinder heads.  [Figure 11-4]  The 

<img src='content_image/527026.jpg'>

<img src='content_image/527025.jpg'>

