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.

       - Mike

proaconstrictor wrote:

I couldn't get the search to work tonight, anyway, any discusion of
this rig yet, for a proa?

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