| 11. | It was driven by a three-cylinder compressed air engine invented designed and made by Peter Brotherhood.
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| 12. | In some cases, such as compressed air engines, the engine may be mechanical rather than electrical.
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| 13. | Compressed air engines can recharge an electric battery.
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| 14. | The inclusion of a regenerator differentiates the Stirling engine from other closed cycle hot air engines.
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| 15. | A praxinoscope made by Ernst Plank, of Nuremberg, Germany, and powered by a miniature hot air engine.
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| 16. | A very simple thermoacoustic hot air engine is the Rijke tube that converts heat into acoustic energy.
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| 17. | In 1872, Gern presented a 6-ton torpedo, powered by a compressed-air engine, but tests showed only modest results.
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| 18. | It was the second mid-air engine failure on one of Air New Zealand's passenger jets in recent months.
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| 19. | The design was unsatisfactory, and the arms were replaced by indicator lamps interlocked to the air engines in 1924.
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| 20. | Rolls-Royce initially offered a variant of the bleed-air engine and would have been developed in partnership with Kawasaki Heavy Industries.
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