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Old 03-07-2012
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Designing a Jordan drogue chainplate

I am designing the two horizontal chainplates that will connect my 12,000# boat to a bridle for a Jordan Drogue. I understand that each chainplate should be able to handle 6,000# with a substantial safety factor so I am looking at an SS bar 2" x 1/4" with a 5/8" diameter hole near the end. This will give me a breaking load of 10,000#.

My problem is that I have no feel for designing the other end of the chainplate - where it is attached to the hull (1/2" thick GRF without a core). That is - should it be 2' long with 3 1/2" SS bolts going through the chainplate, the stern topsides and a similar backing plate or ???
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Old 03-07-2012
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Re: Designing a Jordan drogue chainplate

The following is from the Jordan web site:

Bridle Legs
The design loads for each of the bridle legs are 70% of the drogue design loads.

Attachments on the Hull
The hull attachments for the drogue should be as far outboard and as far aft as possible.
I have no information on the ultimate strength of a typical sheet winch installation, and it would be difficult to evaluate each structure. Unfortunately, a winch is not an ideal structure, since the load is applied above the deck line and tends to overturn the winch and pull it out. The optimum attachment for the drogue is clearly a strap similar to a chainplate, bolted to the hull at the corners of the transom and extending aft with a shackle.

For a load of 14,000 lbs, a strap ľ x 2.25 x 18 inches attached with six 3/8 bolts would provide a conservative design.

A large steel cleat would be acceptable if the deck is thick solid fiberglass and a steel plate is provided underneath.
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