SINCE 1929, a number of tests have been made at New York University on a new type of rotating aerofoil system, invented by Walter Kreiser and Walter Rieseler, and developed by E. Burke Wilford, of the Pennsylvania Aircraft Syndicate.
Klemin, A. and Ruffner, B.P. (1931), "A New Type of Gyroplane: Wind Tunnel Researches and Full‐Scale Tests with a Gyroplane with Rigidly Connected Feathering Rotor Blades", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 12, pp. 305-320. https://doi.org/10.1108/eb029482
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