| 11. | During his time there, thousands of free-piston engines had been sold.
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| 12. | The aircraft is powered by a modified Continental O-200 piston engine.
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| 13. | Today, most general aviation piston engine powered aircraft are naturally aspirated.
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| 14. | It is powered by an air-cooled piston engine driving a fixed pitch propeller.
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| 15. | Thus the 1975 Chevrolet Monza was launched carrying a conventional piston engine instead.
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| 16. | The first successful application of the free-piston engine concept was as air compressors.
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| 17. | Jet engines were taking over from piston engines in the air.
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| 18. | The free-piston engine was patented in 1934 by Raul Pateras Pescara.
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| 19. | The aircraft was powered by two wing mounted Avco Lycoming turbocharged piston engines.
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| 20. | Mechanically, gas turbines can be considerably less complex than internal combustion piston engines.
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