can we see some figures for some boats:   i can't really reliably guess weight of sidecar. never really got it weighed. might be 3-400kg including one crewman(me) and gear. will try weighusing two bathroom scales - one at each end, of each hull (since the hulls seperate apart). --- On Thu, 23/4/09, Mike Crawford <jmichael@gwi.net> wrote: From: Mike Crawford <jmichael@gwi.net> Subject: [harryproa] SA/D and Bruce number calculator To: harryproa@yahoogroups.com.au Date: Thursday, 23 April, 2009, 10:41 PM   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.nwmarine design.com/ sadscrip. htm ,   and the new version, including Bruce Number, is here:     http://www.nuomo. com/boatSadBruce Calculator. 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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