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Rotary-Wing Aerodynamics spheroidal wave functions (5)Recent literature related to rotary wing aerodynamics has increased geometrically; yet, the field has long been without the benefit of a solid, practical basic text. To fill that void in technical data, NASA (National Aeronautics and Space Administration) commissioned the highly respected practicing engineers and authors W. Z. Stepniewski and C. N. Keys to write one. The result: Rotary Wing Aerodynamics, a clear, concise introduction, highly

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