Your theory is just not complete.

And, to deny an object shaped like a venturi does not act
like a venturi is not logical. Just because one generally thinks
of a venturi as a tube like in a carburetor it does not mean
that a venturi can only be a tube. Air passing over the
restriction does not care if it is circular of flattened out.





"PIM" wrote in message ...
A single surface sail has the same length on leeward as on the windward
side.
so there IS NO increased length of the surface.

I am not denying a Venturi,
I am denying that a sail acts as a venturi.

Anyway, what is wrong with my theory ?
it offers a good explanation of what is happening.

Best Regards,

Pim
www.sailtheory.com


"Simple Simon" wrote:
Ahah! Now, you've finally gotten to the crux of the matter.

You say diameter is the important thing. You are right
because when you put a venturi into a hose you get
a suction effect at the ventur. The suction proves
lower pressure exists in the area of the venturi.

In the case of a single surface foil the lower pressure
IS caused by the increased length of the surface which
has the effect of making a smaller pipe for the air to
pass through.


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