On Sun, Nov 14, 2010 at 4:27 AM, tsstproa <bitme1234@yahoo.com> wrote:

Center of gravity and buoyancy. The more I can keep it that way the >more it will resist heeling.

This is meaningless.

Buoyancy along with a light weight craft the beams could be over built >and still not effect the the intended use of design.

The discussion was about harrys vs Atlantics and one mast vs two.  The
harry beams will always be lighter.

Assume just one force to prove one point doesn't make sense.

Maybe, but unless and until you grasp this point, further discussion
is not going to achieve anything.

So for your beams , your saying due to having a ww60/40lw displacement and having an unstayed mast your beams can be built lighter than a pacific or atlantic type using the same construction method being engineered for the specific use on each craft.

Assuming the mast is mounted in a hull, the overall boat weights are
the same and it is a responsible design, the beams on a 60/40 proa
will be the same as the beams on a 40/60 proa.  They will be heavier
than the beams on a 50/50 and lighter than the beams on a 70/30, a
30/70, a 20/80 or an 80/20, etc etc.  The upper limit is if the
windward hull is so small that it is submerged before the boat
capsizes.

You want me to pay 500.$ for what?

I don't want you to pay for anything.  You asked for the laminate of
my beams.  I told you it would cost you $500.

rob

Todd

--- In harryproa@yahoogroups.com.au, Rob Denney <harryproa@...> wrote:

I don't understand your final paragraph. Or see what it or the video has to
do with this discussion. No idea what walla is, nor how it proves that
buoyancy to leeward of the mast makes a boat more stable, apart from the
added righting moment from the mast weight. Assuming the force on the sail
acts horizontally through the coe (and ignoring the rig weight), it makes no
difference to the force required to fly a hull where the mast is located
across the boat. Maybe your rig is a greater component of the righting
moment than it would be on a full size boat? Again, draw a picture (or try
to unbalance a chair by pushing or pulling it sideways) and this will be
obvious.

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