Chain Plate Sizing

[Storm]

Brion,
Gave the wrong wire size. All wires are actually 5/16 inch (not 3/8 inch as I said in first post).

I did some calcs and figured worst case the upper shroud chain plates would see about 4,000 lbs load. I have not found ways to calculate back stay loading. When is the back stay most loaded? When the boat is on a beat or a run? I would think most loading would occur when running (unless you are a racer and are trying to bend the mast in a beat), especially when flying a spinikar- but that is just my uneducated guess.
Regards