TESTS WITH THE CH-47A CHINOOK HELICOPTER IN SOFT CLAY SOILS
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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The primary purpose of the test program reported herein was to determine quantitatively the performance of the CH-47A Chinook helicopter in soft soils. Tests were conducted at three different locations on a range of soil strengths and at three different payloads. A total of 15 landings were made on 27 and 28 May 1965 near Vicksburg, Miss. Subsequent tests were conducted at Aberdeen Proving Ground, Md., from 21 to 24 June 1965. The Aberdeen Proving Ground tests are discussed briefly in Appendix A. It was concluded that a the Chinook has adequate power for lift-off from most soft soil conditions, b a relation exists between sinkage of landing gear assembly into a soil and the ratio of bearing pressure to cone index, and c the presently designed cargo ramp will allow a cargo space entrance height of 72 in. only when the helicopter landing gear sinkage is about 12 in. or less.
- Soil Mechanics