Abstract
Directional stability in landing rollout of the tricycle landing gear arrangement used in light airplanes is shown in a computer replication of a 1935 demonstration. Stability derivatives of aircraft tires are developed based on rolling tire experimental data. A small perturbation analysis using the tire stability derivatives provides a simplified model of the rollout problem, for better understanding and for checks on complete simulations. Eigenvalues in rollout are found for three cases, a sailplane, a light plane, and a large jet transport. A nonlinear transient analysis is used to verify the small perturbation model, for the sailplane case. Castering wheels are found to make negligible contributions to the eigenvalues. The position of the main gear with respect to the c.g. dominates the problem, aft gears being stable. Large airplanes with noncastering nose wheels appear to be stable in rollout over their ranges of airspeed and relative main gear to nose gear loadings. In transient analysis, banking into the swerve, a nonintuitive strategy for avoiding running off runways in side winds, is shown to be effective for bicycle gears, and in particular, for advanced sailplanes with main wheels ahead of the c.g.
Published Version
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