Subject: [harryproa] Re: Hoyt rig
From: "chesapeake410" <chesapeake410@yahoo.com>
Date: 3/24/2008, 11:41 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

Hello, I posted a similar question Aug.7,2007 message No.2731 and
Rob's reply in message No.2732

George Kuck
Chestertown, MD

--- In harryproa@yahoogroups.com.au, "Dale Bolton" <dalebolton@...>
wrote:
>
> Hi Gang the guy who developed this (whom I have never met) is
pretty sharp
> he seems to have made more money on boat ideas than all of us put
> together. The obvious stresses would seem a bit much but what do the
> engineers have to say in this group (I am assuming none have
answered yet).
> I would think that he would have talked to a number of them
already. He also
> seems pretty familiar with unstayed masts and the problems with
sail control
> with that type of mast.
>
>
>
> What would our master guru have to say - Rob, I mean
>
>
>
> Dale
>
>
>
> _____
>
> From: harryproa@yahoogroups.com.au
[mailto:harryproa@yahoogroups.com.au] On
> Behalf Of Robert
> Sent: Monday, March 24, 2008 8:57 PM
> To: harryproa@yahoogroups.com.au
> Subject: [harryproa] Re: Hoyt rig
>
>
>
> 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 HYPERLINK
> "mailto:harryproa%40yahoogroups.com.au"harryproa@..., 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
> 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?
> > >
> > > HYPERLINK
> "http://www.garryhoyt.com/id32.html"http://www.garryhoy-t.com/id32.-
html
> <HYPERLINK
> "http://www.garryhoyt.com/id32.html"http://www.garryhoy-t.com/id32.-
html>
> > >
> > >
> >
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG.
> Version: 7.5.519 / Virus Database: 269.21.8/1340 - Release Date:
3/23/2008
> 6:50 PM
>
>
>
> No virus found in this outgoing message.
> Checked by AVG.
> Version: 7.5.519 / Virus Database: 269.21.8/1340 - Release Date:
3/23/2008
> 6:50 PM
>

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