THE total scope of aerodynamic problems in helicopter design is extremely wide. One can find here such topics as laminar aerofoil sections, boundary layer control, compressibility effects (with all the unpleasant implications of the transonic region), aero‐elastic instability, and, of course, all of the mathematically challenging problems of stability in hovering and in forward flight.
Stepniewski, W.Z. (1952), "Some Aerodynamic Problems in Helicopter Design: A Talk delivered at a Meeting of the Institute of the Aeronautical Sciences on May 28, 1952 in Toronto, Canada", Aircraft Engineering and Aerospace Technology, Vol. 24 No. 9, pp. 266-270. https://doi.org/10.1108/eb032204
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