It does depend on the length difference as stated in the principles
of the venturi effect. The speed of the air is increased when it
is forced through a smaller area. The sail acts like one side of
a venturi in that the air has a smaller area to go through because
of the extra length. The air above that air on the surface of the
foil acts like a venturi also to a small degree. The net effect is
the air moves faster, the molecules become spaced farther apart
and the pressure is decreased. This decreased pressure is a greater
factor causing lift than the air pushing up on the windward side of
the sail.

You might know a lot but you need to learn more when it comes
to the practical application of single-surface foils used on sailboats.

"PIM" wrote in message ...

"Simple Simon" wrote:
I think you should do a little research into Bernouilli and Venturi.

I did, see www.sailtheory.com/bernoulli.html

I am not denying that air goes faster on the leeward,
But it is not depending on the length difference (leeward to windward)

I used to be a Naval Architect/Yacht designer.
Now I am a designer of exhaust systems,
for what you need a lot of aerodynamics.
So I know of Bernoulli.
That I do not use formulas is to make it easy for people who did not study
maths muchs

Best Regards



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