Two representative helicopter rotors with widely different characteristics were investigated to determine the effect of wind velocity on the power required for sustentation. The rotors were investigated with the Langley helicopter apparatus and were powered by a 1350-horsepower engine.nThe results of this investigation showed an appreciable decrease in power required for both rotors for a given thrust as the wind velocity increased;for example, at a thrust of 2500 pounds decreases of about 5 percent in power required at 8 miles per hour and about 17 percent at 15 miles per hour were shown.
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