RESULTS OF SOME WIND TUNNEL AND FLIGHT STUDIES WITH HELICOPTERS AT NASA
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Wind-tunnel tests and analytical studies which indicate power requirements of tandem-rotor helicopters in forward flight
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[2] George E. Sweet,et al. Hovering Measurements for Twin-Rotor Configurations with and Without Overlap , 1960 .
[3] Robert P Rabbott,et al. Experimental Investigation of the Aerodynamic Loading on a Helicopter Rotor Blade in Forward Flight , 1956 .