|Subject: [harryproa] Re: Hoyt rig|
|From: Mike Crawford |
|Date: 3/24/2008, 3:21 PM|
I'm a big fan of the Hoyt jib boom, but I have some worries about the new rig.
On one hand, it solves a lot of problems.
On the other, there are some serious stress concentrations on the connections between the boom and the mast, and the gaff and the mast. That little ~30 cm post has to take some serious bending and torsion from the sail and front/back "stays", while also transferring that force into a mast that is already under a lot of stress. There's also got to be some significant out-of-column compression once those stays are taught.
People who design in carbon would probably say that you can calculate these stresses with a good finite element analysis program. They would be right, but it would still worry me.
I personally prefer a simpler design that eliminates stresses -- that's one of the reasons I'm such a fan of the Harryproas. Both the easyRig and a wishbone or fixed-boom una rig would both require simpler masts (good for repairs and emergencies, too). They wouldn't have that clean leading edge, though.
I couldn't get the search to work tonight, anyway, any discusion of
this rig yet, for a proa?