WHEN designing an airscrew one has to choose from a family, tested in the wind tunnel, the right diameter and blade angle.
von Baumhauer, A.G. (1939), "Selecting an Airscrew: A Simple Method Utilizing the “Flight Coefficient”, Cv", Aircraft Engineering and Aerospace Technology, Vol. 11 No. 1, pp. 9-12. https://doi.org/10.1108/eb030420
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