Abstract
Equations for evaluating the longitudinal stability in steady motion of high-speed wing-in ground-effect craft were formulated. The craft may consist of an arbitrary number of wings within, or out of, the ground effect. Small perturbations superposed on steady forward motion of the craft were assumed and were linearized in comparison with steady forward motion. The procedure has yielded a fifth-order equation with respect to the characteristic roots. It was applied to special conditions for trend analysis and to an experimental WIG craft. A parametric study on the effect of size and location of the horizontal tails of the craft on the stability has given reasonable figures and tendencies.
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