On Thu, 24 Mar 2011 05:39:14 +0700, Bruce in Bangkok
wrote:

On Mon, 21 Mar 2011 20:35:30 -0500, CaveLamb
wrote:

Jessica B wrote:

Hmmm... well, I looked up theoretical boat speed... 1.34 x the root of
LWL. But, I read that when the boat leans (heels) then the LWL would
get longer, so the theoretical speed would go up right? Also, what
about the water moving. If it's going in the same direction, then that
would decrease the time you spend traveling.



But how MUCH longer does the waterline get?
Seldom more than a few inches at most.

As for the other, it's called current.
And if you are going against it, slower than the current is running,
you go backwards...
What fun, huh?


The long overhangs was a relic of one of the old racing rules that
penalized long waterlines. So, the crafty people built a boat with a
very short waterline and sailed it heeled and had a effective
waterline much longer then what was measured for handy cap rating.

Current is only a real help in the few instances where it always runs
the same way. The more usual conditions have it going one way for a
half a day and the other way for the other half. Net help = Zero.

Cheers,

Bruce
(bruceinbangkokatgmaildotcom)

At first someone claimed that the waterline difference would be tiny.
I found to be what seems a recent photo where that's not the case, and
now you're claiming it's a relic? I don't get that. Either it can be a
factor or it can't be.

Yes, I get that current is only a real help in a few instances. What
about the gulf stream example? I don't think that changes direction
does it?