World War One provided a catalyst for rapid technological innovation. The pace of development of more powerful and efficient engines kept pace with th development of stronger air-frames and more potent weaponry. Powerplants follow four different schemes:

  1. Air Cooled Rotary Engines:

    A circular configuration where the entire engine spins and the propellor is fixed to the engine body.

  2. Air Cooled Radial Engines:

    A circular configuration where the engine is stationary and the propellor is turned by a crankshaft.

  3. In-line Water Cooled Engines:

    A linear configuration where the pistons are in a single bank along the length of the engine.

  4. V-configured Water Cooled Engines:

    A linear configuration where two banks of pistons are arranged left side and right.