Measurements of ground-reaction forces and vertical center-of-gravity accelerations of a bomber airplane taxiing over obstacles

James M. Mckay, Richard H. Sawyer, Albert W. Hall
naca-tn-4400
SEP 1958


An investigation was made on an unswept-wing four-engine bomber airplane to determine the vertical and drag ground-reaction forces imposed on the landing gear when taxiing over obstacles 1.5 and 3.0 inches in height and 1, 2, and 4 feet in width. Vertical accelerations at the center of gravity of the airplane and shock-strut displacement were also measured. The investigation included a range of ground speeds from 10 to 70 miles per hour. The weight of the airplane was approximately 95,000 pounds. Results are presented of the effects of ground speed and the widths and heights of the obstacles on the vertical and drag forces, on vertical acceleration at the center of gravity of the airplane, on shock-strut displacement, and on response of the upper mass of the airplane structure.

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