| 21. | Virtually all piston engines used in military aircraft were long-stroke engines.
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| 22. | The open-frame helicopter was powered by a Rotax 582 piston engine.
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| 23. | A typical example is counterweights on crankshafts in piston engines.
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| 24. | It is powered by a Vedeneyev M14P radial piston engine.
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| 25. | Piston engines normally use valves which are driven by camshafts.
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| 26. | The performance of the Me 163 far exceeded that of contemporary piston engine fighters.
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| 27. | It is powered by a 20 kW ( 26 hp ) Sachs piston engine.
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| 28. | Many modern Islanders / Defenders have been fitted with turbine rather than piston engines.
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| 29. | A gas turbine offers some advantages over a piston engine.
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| 30. | It was redesignated Hawk 4 when development of the piston engine version was dropped.
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