Universal on-board starting system
Different from the universal on-board starting system, the starting device and the starter engine of the compact on-board starter are attached directly to the internal combustion engine. Thus the internal combustion engine and the on-board starter form a compact unit. According to the available space it has to be decided individually for every model which one of the two variations can be used.

Compact on-board starting system
At this variation only the starting device is attached directly to the internal combustion engine. The starter engine is placed separately from the internal combustion engine inside the fuselage, according to the main stress or to space requirements. A propeller shaft that is variable in length transmits the power from the starter engine to the starting device at the internal combustion engine.