The inverse problem of finding the shock‐wave angle when a supersonic stream passes round a bend of (180°—i°) involves a double interpolation from tables prepared for the direct problem. This may be avoided by reducing the problem to the solution of a cubic equation. Most of the phenomena associated with oblique shock waves can be deduced from this cubic equation.
Naylor, V.D. (1954), "The Shock‐Wave Cubic: Presentation of an Equation which Permits the Solution of Shock‐Wave Problems without Tables", Aircraft Engineering and Aerospace Technology, Vol. 26 No. 12, pp. 407-409. https://doi.org/10.1108/eb032501
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