chainplate calculations for a jordan drogue

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Thank you!

I thought the ultimate tensile strength was the worst case scenario, and by using the yield strength, we don't need to do use any further reductions?

70,000 should be the breaking strength of 316, so the breaking strength of 1.5"x0.25"x12 316 chainplate would be ~ 17,500 lbs, in which case, 7,500 lbs gives that >50% safety margin.

The topsides are 1/8" thick, so not sure if going with a bigger chainplate would make a lot of sense. Fiberglass/bolts will probably rip out first before the chainplate breaks.

Has anybody installed jordan drogue chainplates? Have you used a backing plate? Does it have to be steel or could I get away with starboard/aluminum or G10?

Many thanks!
Gleb