A type of internal combustion engine used chiefly in aircraft, having its cylinders fixed radially around a rotating crankshaft.
- In another cost-cutting move, many M4s were equipped with a radial engine originally designed for aircraft.
- One important concession has been made with a more modern radial engine replacing the original rotary engine.
- During his spare time, Northrop began designing a sleek multi-seat monoplane that would be powered by a large radial engine.
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