by GreenLake » Thu Apr 14, 2022 2:42 pm
Yeah, that would put you over by 16%.
The max (static) force on your vang should be right when the DS capsizes(*). That force depends on the righting moment you have. A dinghy with a crew on a trapeze may have a righting moment that's more than 16% bigger than what you have (or not - if you sail with two beefy dudes on the rail).
Up the capsize limit, sail force goes up with the square of the wind speed, but linear in the sail area. So, if you're not pushing yourself usually, the difference may not matter as much.
For the kit you ordered, per Tom's drawing, the most loaded parts would be the double block and the connection of the lower unit to the mast. The double block you could upgrade easily, if you felt it was under specd. The connection to the mast might fail, but unlike a block, it would work fine up to that point. A block might get deformed or hard to use near the limit.
Also, if a vang fails, that's not the worst outcome. Better the vang as the weak link than the boom.
Your thoughts?
(*) this assumes you use your vang for vang sheeting going upwind. Going downwind, things are more complicated, because your boat will rarely pitchpole, but your apparent wind will be 5 knots slower (or more, if you get your DS on a plane).
~ green ~ lake ~ ~