Wow. this is dumb.

Roger Long wrote:
Balance of sailboats is a huge myth. The whole CP, CLR, Lead business
was just a way for yacht designers to look scientific.
And the world is flat!
The fact that
you can make huge area changes, such as the mizzen, without much helm
angle change shows how silly the whole idea is. There are schooners
with 10% negative lead and they sail fine.
I can't even sail my ketch to windward without the mizzen and I can't
fall off the wind without headsails set. Same with my sloop, if I take
down the main it won't point as high. There goes that theory!

Mainsail shape is more of an issue as a tight leach is a huge trim
tab.
The entire main is a trim tab on a masthead sloop. On a ketch or yawl
the mizzen is the trim tab. Mainsail shape and size is critical (which
blows your previous comment away again.
The primary source of weather helm is the fact that, while
heeled, the drag of the hull is over here and the drive of the sails
is way out there.
That is correct score one point.
To go to windward, the hull must make leeway
Wrong. The idea is to minimize leeway. More leeway equals less
distance to windward.
which
means there is sideways flow on the rudder.
The flow is only sideways in a very poorly designed boat. Boats wants
to go pointy end first. The flow across the rudder and keel have a
slight angular component but that gives "lift" hydrodynamically.

Unless it has way too much
balance, it is going to have pressure on it.

This had to be a troll........