IT can be shown that a close analogy exists between the system of forces acting on the blades of an airscrew and on a direct‐acting engine.
Day, T.H.B.E. (1943), "An Airscrew‐Engine Analogy: Similarity between the Forces Acting on the Two", Aircraft Engineering and Aerospace Technology, Vol. 15 No. 8, pp. 218-222. https://doi.org/10.1108/eb031040
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