Lateral-Directional Stability of Wig-in-ground-Effect Craft : Derivation of Stability Evaluation Formula and Trend Analysis

Abstract

Equations for evaluating the lateral-directional stability in steady rolling motion of high-speed for wing-in-ground-effect crafts were formulated. The crafts may consist of arbitrary number of wings within or out of ground effect. Small perturbations superposed on the steady rolling motion of the craft were assumed and were linearized in comparison with the steady rolling motion. The parametric studies on the effect of sizes and locations of the vertical tails of the boat on the stability have given reasonable performances and tendencies.