Accession Number : AD0775744

Title :   Prediction of Aircraft Ground Performance by Evaluation of Ground Vehicle Rut Depths

Descriptive Note : Final rept. Jan-Jul 1973

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : Turnage, G W ; Brown, D N

PDF Url : AD0775744

Report Date : Feb 1974

Pagination or Media Count : 125

Abstract : Two single aircraft tires (20-20, 22-PR and 49-17, 26-PR) and three standard military trucks were tested under towed (nonpowered, nonbraked) and self-powered conditions, respectively, in buckshot clay test beds whose strengths ranged from about 110 to 600 cone index. Tests included multiple passes over the prepared test beds (usually 100 passes for the aircraft tires, 10 for the trucks) at low speeds. Only single-wheel configurations were examined (i.e., outer second- and third-axle wheels of the M35A2 and M51 were removed). Curves were developed to allow soil strength (airfield index) to be estimated directly from the rut produced by single or multiple passes of any of the three trucks. These curves were developed through use of a dimensionless prediction term (tire-clay numeric Nc) that allows pneumatic tire performance to be scaled over a wide range of soil strengths, wheel loads, and tire size, shape, and deflection conditions.

Descriptors :   *AIRCRAFT TIRES, *FORWARD AREAS, *SOILS, GROUND VEHICLES, INTERACTIONS, LANDING GEAR, PREDICTIONS, SOIL MECHANICS, SOIL RESISTANT PROPERTIES

Subject Categories : Aircraft
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE