Subject: [harryproa] Re: Gaff easyrig?
From: "Robert" <cateran1949@yahoo.co.uk>
Date: 3/22/2009, 4:48 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

This has been a few designs doing just this. There is the problem of keeping enough jib tension without having too tight a leech. There may be a sweet spot that balance the leech tension with the jib tension You can go the whole way and have a full wing sail. There are a few of these around, such as the Walker.
Personally, I don't see much difference between a high gaff rig and a square topped main. I have also seen designs for a high curved gaff almost a cross between a gunter and a gaff which makes a lot of sense to me.

--- In harryproa@yahoogroups.com.au, Rob Denney <harryproa@...> wrote:
>
> G'day,
>
> Gaff main sails are fine, but the weight of the gaff and the lump of
> mast sticking up above the sail are both negatives. A gaff jib boom
> needs to be pretty strong, so heavy.
>
> regards,
>
> Rob
>
> On Sun, Mar 22, 2009 at 12:28 AM, Gardner Pomper <gardner@...> wrote:
> > Thanks, I had not seen that. I have been leery of booms even before one hit
> > my wife in the head, scaring everyone rather badly. One of the things I like
> > about the harryproa is that it keeps the boom away from the crew.
> >
> > This picture is just a regular gaff rig main, though. I mean the easyrig,
> > with both the main and jib on the same boom. Can't you put a mirror at the
> > top of the mast to move away from triangular sails.
> > - Gardner
> >
> > On Sat, Mar 21, 2009 at 11:19 AM, Kim Whitmyre <kwhitmyre@...>
> > wrote:
> >>
> >> Gardner Pomper wrote:
> >> > This is probably a dumb question, but what is the problem with a
> >> > "gaff" easyrig? By this I mean an easy rig with a boom at both the top
> >> > and bottom of the mast, so that both the jib and main are rectangular
> >> > in shape, instead of triangular? Everything I read indicates that a
> >> > triangular sail is inefficient, and that more sail area higher up is
> >> > better. I have seen solid wing sails in this configuration.
> >> >
> >> > I know weight aloft is a bad thing on a monohull, because it
> >> > intensives the pendulum effect m the inevitable heeling, but on a
> >> > multihull, which should never lift a hull (cruising, not racing proa)
> >> > it doesn't seem like it will matter until you are in alot of trouble
> >> > anyway. Plus, having a rectangular sail should lower the center of
> >> > effort considerably, to keep you out of trouble.
> >>
> >> Gardner, have you not seen the wingsail used on most of the Wharram
> >> designs? It is exactly as you describe, with the exception of the lower
> >> boom: it has none, but instead runs on a traveler between the hulls.
> >> Here is a picture of my boat in the slip with the main up:
> >>
> >> wingsail <http://farm2.static.flickr.com/1023/1207431702_4244ed6a4e_o.jpg>
> >>
> >
> >
>

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