FLIGHT is the result of displacing air by surfaces and utilizing the reactive forces so created to lift, propel and control the craft.
de la Cierva, J. (1934), "Rotary Wing Aircraft: A Comparison of the Various Gyroplane, Helicopter and “Paddle‐Plane” Types", Aircraft Engineering and Aerospace Technology, Vol. 6 No. 6, pp. 159-160. https://doi.org/10.1108/eb029805Download as .RIS
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