AIRCRAFT GROUND-FLOTATION INVESTIGATION. PART IV. DATA REPORT ON TEST SECTION 3
Final technical rept.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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This data report describes work undertaken as part of an overall program to develop ground-flotation criteria for the C-5A aircraft. A test section was constructed to a width adequate for two test lanes. Each lane was divided into three items having different subgrade CBR values and different traffic surfaces. Item 1 was surfaced with modified T11 aluminum landing mat, item 2 with M8 steel landing mat, and item 3 remained unsurfaced. Traffic was applied to the two lanes using twin-wheel assemblies with 100-psi tire inflation pressures and 70,000-lb loads. On one lane, the wheel assembly consisted of two 56x16, 32-ply aircraft tires spaced 35 in. c-c. On the other lane, two 56x16, 24-ply aircraft tires were used spaced 45 in. c-c. The information includes layout of the test lanes, characteristics and print dimensions of the load assembly tires, and data collected on soil strengths, surface deformations and deflections, and drawbar pull. The traffic-coverage level is given at which failure was evidenced on each test item.
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