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Rotary engine
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===Hargrave=== [[Lawrence Hargrave]] first developed a rotary engine in 1889 using compressed air, intending to use it in powered flight. Materials weight and lack of quality machining prevented it becoming an effective power unit.<ref>[http://www.adb.online.anu.edu.au/biogs/A090194b.htm Hargrave, Lawrence (1850 β 1915)] {{Webarchive|url=https://web.archive.org/web/20110524142500/http://www.adb.online.anu.edu.au/biogs/A090194b.htm |date=2011-05-24 }}. Australian Dictionary of Biography Online.</ref>
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