To improve helicopter performance, National Advisory Committee for Aeronautics has developed series of laminar flow airfoil sections; having little or no pitching moment, and lift drag ratios almost twice as great as those of NACA 230 series; such advantages as increased payload, improved hovering, safer operation, and diminished stress on rotor hub bearings are realized.
New blades for better helicopters
Aviation Week
Aviation Week ; 48 , n 24
1948
Article (Journal)
English
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