[BITList] This should bring some responses.
John Feltham
wantok at me.com
Tue Nov 16 13:23:40 GMT 2010
http://en.wikipedia.org/wiki/Contra-rotating_propellers
http://en.wikipedia.org/wiki/Counter-rotating_propellers
http://en.wikipedia.org/wiki/Critical_engine
http://en.wikipedia.org/wiki/Packard_V-1650
ooroo
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