Subject: Re: [harryproa] SA/D and Bruce number calculator
From: Gardner Pomper
Date: 4/23/2009, 8:49 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au



Hi,

Thanks! That's cool!

Have you happened to run across any info on how to calculate the
center of effort of a sail? I have also been thinking about sailplans
and am trying to figure how much headsail I can have before putting
the COE too far forward for the ballestron rig to weathercock.

- Gardner

On Thu, Apr 23, 2009 at 8:41 AM, Mike Crawford <jmichael@gwi.net> wrote:
>
>
>
>   For a quick way to calculate Sail-area-to-displacement ratio and Bruce
> number, I use a script I modified from the SA/D calculator at
> nwmarinedesign.com.
>
>   The original is here:
>
>     http://www.nwmarinedesign.com/sadscrip.htm ,
>
>   and the new version, including Bruce Number, is here:
>
>     http://www.nuomo.com/boatSadBruceCalculator.htm .
>
>   It's not rocket science, but I've been doing so many what-if scenarios
> with mast height and sail shape that I got tired of plugging the numbers
> in.  I also had little feel for the different values of the BN until I saw
> them calculated next to the SA/D each time.  Now it's really easy to see
> what another crew member or some extra roach might do.
>
>        - Mike
>
>
>

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