Model Study of C-5A Landings on Dow Truss Web Landing Mat.

摘要

A series of model C-5A landing tests on 4 by 4.5 ft. and 2 by 9 ft. Dow truss web landing mat runways were studied using a 1/7 scale physical model. Model landing mat units were constructed of extruded aluminum joint edges bonded to a foam core fiber glass panel. Simulated landings were made on 14.5 by 128 ft. mat runways. The model 4 by 4.5 ft. mats were tested in four runway laying patterns. Laying patterns without a transverse hinged joint formed the most stable runway. When laid in the standard brick pattern with a transverse hinged joint, the 4 by 4.5 ft. mat runway was more stable than the 2 by 9 ft. mat runway. The 2 by 9 ft. mat runways were tested only in the standard brick pattern. Restraint at the runway edge did not prevent buckling of the 2 by 9 ft. mat runway in the standard brick pattern. tension anchors at the touchdown end of the runway controlled the longitudinal displacement and prevented buckling of both mat types when laid in the standard brick pattern. The use of end anchorage appears to be a practical method to reduce mat runway maintenance and prevent buckling failure. (Author)