Accession Number : AD0780698

Title :   Helicopter Movement on Unimproved Terrain.

Descriptive Note : Technical rept.,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Rush,Edgar S. ; Green,Charles E.

Report Date : JAN 1974

Pagination or Media Count : 148

Abstract : A brief review is presented of the current state of the art of criteria for determining the ground-flotation requirements for landing gear of aircraft, particularly fixed-wing aircraft, and criteria for estimating cross-country performance of military vehicles. Discussions are also presented of three soil strength parameters: California Bearing Ratio (CBR), airfield index (AI), and cone index (CI). Results of tests with three helicopter tires in prepared and natural soils are presented, and relations are shown among soil strength, towed motion resistance of some assumed helicopter configurations, and maximum-drawbar-pull capabilities of selected ground vehicles. Also presented is the distribution of terrain factors mapped in a selected West German transect and the probability of moving helicopters over the terrain. (Modified author abstract)

Descriptors :   *Helicopters, *Offroad traffic, *Soil mechanics, Ground support equipment, Aircraft tires, Soils, Trafficability, West Germany

Subject Categories : Helicopters
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE