MEASUREMENTS OF GROUND-REACTION FORCES ANDnVERTICAL ACCELERATIONS AT THE CENTER OF GRAVITY OF AnTRANSPORT AIRPLANE TAXIING OVER OBSTACLES

摘要

An investigation was made on an unswept-wing four-engine transport airplane to determine the vertical and drag ground-reaction forces imposed on the landing gear when taxiing over obstacles 3.0 inches in height and 1 and 4 feet in width. Vertical accelerations at the center of gravity of the airplane and shock-strut displacement were also measured. The investigation covered a range of ground speeds from 12 to 86 knots. The weight of the airplane for these tests was approximately 38,350 pounds. Results are presented of the effects of ground speed and obstacle width on the vertical and drag forces, on vertical accelerations at the center of gravity of the airplane, on shock-strut displacement, and on response of the upper mass of the airplane structure.