Subject: [harryproa] Re: Schooner v. Unarig
From: "Herb Desson" <>
Date: 12/7/2006, 5:58 AM

Ah, I take your point. So the relative force on the mast due to sail
size is largely irrelevant.

So we will gain strength due to the shorter masts, but weight will be
governed by breaking strength. Need to do some more research.

Thanks for straightening me out.

Best regards

--- In, "Rob Denney" <proa@...> wrote:
> ----- Original Message -----
> From: Herb Desson
> To:
> Sent: Friday, December 01, 2006 5:27 PM
> Subject: [harryproa] Re: Schooner v. Unarig
> I am not quite sure what to make of the smaller sail area, but I think
> it is clear that in any given weather there will be less force on each
> mast for the schooner than for the single mast of the sloop.
> Agreed, but the design load is still that force required to
capsize the boat, so they have to be as strong as the single mast.
The same applies to the hull reinforcing. Supporting each mast at the
end of the beam is very easy. However, if only one sail is doing the
work, the hull has to be strong enough to transmit this load to the
other beam, so ends up the same as if the mast was in the middle.
> I look forward to seing the results of your calculations. I know FEA
> costs money, but would it be possible to include an analysis of
> exactly the same sail shape to get comparability? I am not sure how
> comparable a jibless schooner is to a balestron sloop from a weight
> point of view. My first thought is that it wouldn't make much
> difference, but clearly my first thoughts are not very reliable in
> these matters.
> You ain't kidding about the cost of FEA! I can't afford to get
into sail shape anaysis. We engineer the mast based on the scenarios
it sees. The ballestron rig and the schooner would be pretty close to
the same weight.
> Best regards
> Herb
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