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Published online by Cambridge University Press: 04 July 2016
The title of this paper permits considerable latitude; also, there have been several previous papers on rather similar subjects. It seems best to explain therefore that the two primary purposes of this paper are, first, to bring the entire VTOL coverage of NASA's Langley Research Center up to date; and, second, to review a segment not covered in the references mentioned, namely, helicopter research. Also included are background history, and indications of the direction in which the research seems headed.