Thread: L.H. Leonard "Helicopter-Type Aircraft" VTOL Tailsitters (1939)
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Old 20th May 2011, 19:28
jzichek jzichek is offline
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Re: L.H. Leonard "Helicopter-Type Aircraft" VTOL Tailsitters (1939)
RetroMechanix.com was down yesterday due to some technical issues but is now back up and running; check out the L.H. Leonard article, when you get the chance.
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