Subject: [harryproa] Re: Hoyt rig
From: "Robert" <>
Date: 3/24/2008, 8:57 PM

I like the fancy lug rig but am not sure about the airflow over the
lee side when the mast is to lee. It looks like a great big bump for
the air to go over, especially in stronger winds. I think I prefer
something more like the wind surfer rigs with a front edge developed
from small plastic triangles in front of the mast. I can't really see
any advantage over a balestrom rig with a gaff. I have been thinking
of having top and bottom ballestrom type booms to allow squaring of
the top of the foresail. On the Hoyts rig, tHe stress of those right
angle bends would cost a bit of weight.
Robert--- In, Mike Crawford
<jmichael@...> wrote:
> 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
> 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
> 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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