Tom Speer made some comments about the centre of inertia and the
centre of rotation need to be matched to avoid oscillations when it
has no sail up,
regards
Robert
--- In harryproa@yahoogroups.com.au, "Rob Denney" <proa@i...> wrote:
>
> G'day,
>
> The 64 dollar question! First, we will try sailing harry and
Visionarry with only the main and see how it works. Should not be a
problem, but needs to be checked. If there is a balance problem,
then a wing mast would be a partial (maybe complete) solution as it
moves the centre of effort forward, probably quite a distance vs a
rig with a large round mast. Next thing to try is raking the mast
forward (easy with a wing, less easy with a round tube) which will
move the coe forward and if the mast is sitting on a stub mast
(which is vertical), it will also reduce the sheeting loads. At the
expense of a peculiar looking rig, maybe with upwind deficiencies,
maybe with interesting structural problems.
>
> The wing mast on Elementarry will sit on a stub mast, and have
variable rake so we shall see.
>
> regards,
>
> rob
> ----- Original Message -----
> From: David Howie
> To: harryproa@yahoogroups.com.au
> Sent: Wednesday, March 08, 2006 2:56 AM
> Subject: Re: [harryproa] Una Rig
>
>
> How would you translate this to a full size Harry? Would you
take it up to
> similar sail area to the original? i.e. one big mast instead of
two small
> ones.
>
> ------ Original Message ------
> Received: Mon, 06 Mar 2006 11:29:24 PM MST
> From: "Rob Denney" <proa@i...>
> To: <harryproa@yahoogroups.com.au>
> Subject: Re: [harryproa] Una Rig
>
> G'day,
>
> Cut a hole in the side of the hull, put in a mast tube and used
one of the
> existing rigs. Next step is to build a wing mast, as soon as
the materials
> arrive.
>
> Sail area is 11 sqm. Sailed on the weekend in 5-12 knots. Went
past a Nacra
> 18sq and a Hobie 17 downwind (both seemed to be trying pretty
hard) and was
> pointing as high and as fast upwind, although I was a fair way
behind them so
> the speed may not be correct. They were trapezing, I was
sitting in the
> middle of the tramp, so could definitely use some more power.
>
> Regards,
>
> Rob
> ----- Original Message -----
> From: oceanplodder2003
> To: harryproa@yahoogroups.com.au
> Sent: Tuesday, March 07, 2006 12:13 PM
> Subject: [harryproa] Una Rig
>
>
> Did you simply put one of the existing ( schooner )rigs in
the middle
> or did you increase the size to try and match sail areas??
>
>
>
>
>
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