The problems of static and dynamic longitudinal stability both at high speeds and at low speeds are discussed and data are presented which indicate recent progress made in the solution of these problems.

STABILITY, LONGITUDINAL - DYNAMIC↗

NASA NTRS1942

Some theoretical considerations of longitudinal stability in power-on flight with special reference to wind-tunnel testing

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Donlan, Charles J↗

NASA NTRS1939

An approximate spin design criterion for monoplanes

A quantitative criterion of merit has been needed to assist airplane designers to incorporate satisfactory spinning characteristics into new designs. An approximate empirical criterion, based on the projected side area and the mass distribution of the airplane, has been formulated in a recent British report. In the present paper, the British results have been analyzed and applied to American designs. A simpler design criterion based solely on the type and the dimensions of the tail, has been developed: it is useful in a rapid estimation of whether a new design is likely to comply with the minimum requirements for safety in spinning.

Seidman, Oscar↗