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This study investigates an instability that was observed during high-speed taxi tests of an experimental flying-wing aircraft.In order to resolve the reason of instability and probable solution of it,the instability was reproduced in simulations.An analysis revealed the unique stability characteristics of this aircraft.This aircraft has a rigid connection between the nose wheel steering mechanism and an electric servo,which is different from aircraft with a conventional tricycle landing gear system.The analysis based on simulation results suggests that there are two reasons for the instability.The first reason is a reversal of the lateral velocity of the nose wheel.The second reason is that the moment about the center of gravity created by the lateral friction force from the nose wheel is larger than that from the lateral friction force from the main wheels.These problems were corrected by changing the ground pitch angle.Simulations show that reducing the ground pitch angle can eliminate the instability in high-speed taxi.
This study investigates an instability that was observed during high-speed taxi tests of an experimental flying-wing aircraft. In order to resolve the reason of instability and probable solution of it, the instability was reproduced in simulations. An analysis of the unique stability characteristics of this aircraft. this aircraft has a rigid connection between the nose wheel steering mechanism and an electric servo, which is different from aircraft with tricycle landing gear system. The analysis based on simulation results suggests that there are two reasons for the instability. The first reason is a reversal of the lateral velocity of the nose wheel. The second reason is that moment moment about the center of gravity created by the lateral friction force from the nose wheel is larger than that from the lateral friction force from the main wheels These problems were corrected by changing the ground pitch angle. Simulations show that reducing the ground pitch angle can elimina te the instability in high-speed taxi.