It seems to say that a spay gun can't work. Hhahahhahahaha. Remember I
said energy is ALWAYS conserved. Now can you explain why the air
pressure is lower at the surface in the coanda effect without involking
the 'MC' priciple?

Hhahahahahaha

Cheers MC

Jan-Olov Newborg wrote:
(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!

Jan-Olov Newborg