(Jan-Olov Newborg) wrote in
om:

(Thom Stewart) wrote in message
...
Jan,

Your reply, once again, is loaded with errors and show very little
depth of understand of the very things you are discussing.

You say velocity cannot create low pressure. WRONG!! Just think of a
painter's spray gun. The paint is introduced into the air stream by
a low pressure created by the velocity of the air thru a venturi. A
hand pumped bug sprayer creates a low pressure by velocity over the
tip positioned in that high velocity steam. This is something you
have to come to terms with understand the workings of a sail

I asked you "What is the Ground effect have to do with a sail" you
elected to not answer that but you go off half cocked about wings,
sails, rudders, curved roofs etc all working the same. I AGAIN ASK
YOU to explain how ground effect is of importance in the operation of
a Sail?

Even in your use of Newton's Law your understanding is WRONG! You
say deflecting the air thus creating a force. Jan the air flow is the
FORCE. The deflecting is the action, which creates the reaction. Your
understanding of Newton's first law leaves at lot to be desired.

Jan, you better read some of those web sites you are calling up on
Search.

Ole Thom

The Windsock seen at every airport and your beloved "Venturi Pipe" (
The Venturi effect" is very often misunderstood as the so called
"Bernoulli Effect"). It seems like The Bernoulli process always must
take place inside a Venturi Pipe! If not there will no "Effect".

The Ground Effect is just what physically happens in the Windsock and
in the Convergent Entrance Part of the Venturi Pipe! The longer into
the Venturi Pipe constriction we goes, the HIGHER TOTAL PRESSURE we
get and the lower airflow speed we get! Since you think that a sail
is some sort of half venturi pipe, you have the

Pim explains some of the so called "Bernoulli Effect Experiments"
physically correct!

http://www.sailtheory.com/experiments.html

Read all of PIMs exellent webpages!

You don´t need physical Sail explanations than that!

This webpage debunkes the false "Bernoulli Effect explanation" in the
painter's spray gun:

http://www.informatik.uni-frankfurt..../MIS/mis6.html

Try to read and understand!

What, your ****?


Listen my children! The Timothy Leary of aerodynamics speaks!

Bertie