AIRSCREW data for performance estimation, in practical form, is generally acceptable in the design office, and the present charts and notes have been found useful and convenient in use.
Willis, J.G. (1938), "Estimating Thrust Horse‐Power: Some Practical Charts and Data for the Design Office", Aircraft Engineering and Aerospace Technology, Vol. 10 No. 7, pp. 206-211. https://doi.org/10.1108/eb030336
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