THE methods and formula outlined below are applicable to any shape of fuselage, but an elliptical one is assumed to serve as an illustration.
Kittelsen, H.M.J. (1941), "Tapered Spar Frames: An Approximate Method for the Determination of the Stresses in, and Deflections of, a Fuselage", Aircraft Engineering and Aerospace Technology, Vol. 13 No. 4, pp. 90-94. https://doi.org/10.1108/eb030756
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