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• The Cold Stowage group retrieves payloads that have returned from the International Space Station via the SpaceX Dragon Capsule.
• They utilize NASA’s C9 Aircraft for this operation and were in need of cargo straps to hold down the hardware used for transportation of the payloads.
• The HUNCH program fabricated Short, Medium and Long Cargo Retention Straps for this operation.
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1st: The HUNCH program was asked to provide samples of the stitching in both horizontal and vertical directions to determine which, if either was better.
Results: The horizontal stitching had a better load capability.
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Horizontal Stitching Test to Failure
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Horizontal Stitching (1) vs Vertical Stitching ([2]) Test to Failure
0
1000
2000
3000
4000
0 1 2 3 4 5 6 7 8 9
Load (lbf)
Crosshead (in)
1[2]
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2nd : The HUNCH program was asked to provide lot samples, as they fabricated the straps, to be tested for both nominal load and failure loads
Results: All lots passed with no issues.
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Full Strap w/hooks test
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8 Full strap w/hooks, 2000lb load tests 2 Full Strap w/hooks, 3500lbs failure tests
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Cargo Straps are used during SpaceX Payload Retrieval Operations
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Long Straps restraining a stack of 4 Cargo Transfer Boxes
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Short and Medium Straps restraining Powered Payload Transfer Box
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Short Straps restraining LiFePo4 Battery Box