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 | | Re: Human Powered Helicopter
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| (...) I think there was also a small Canadian built UAV for the US Navy that used counter rotating coaxial rotors... (URL) even if not coaxial (ie, CH-47) there doesn't seem to be any any out there with counter rotating rotors. Maybe they started on (...) (20 years ago, 8-Aug-04, to lugnet.org.ca.rtltoronto)
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