WE first derive for jet aeroplanes the formulae for the least thrust sufficient for a specified angle of climb. In the mathematical derivation of formulae we make use of the method represented by H. Freeman in J. of Ae. Sci. No. 3/1947, ‘Simple Analytic Equations for the Velocity of an Aeroplane in Unaccelerated Level, Climbing and Diving Flight’. We then see that through a simple deformation the equations can be brought into such a form as to make it possible to represent the steepest climbing angle, the corresponding flight velocity and the rate of climb obtainable at a specified thrust by means of a combined, very simple, dimensionless vector diagram.
Järvineva, E. (1951), "The Steepest Angle of Climb of Jet Aeroplanes in Unaccelerated Flight: A Representation of the Problem of Finding the Steepest Angle of Climb in the Form of a Simple Dimensionless Vector Diagram", Aircraft Engineering and Aerospace Technology, Vol. 23 No. 3, pp. 76-77. https://doi.org/10.1108/eb032009
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