how a sail works, who can help me explain?
 

"Jan-Olov Newborg" wrote in message

High airflow velocity can never create low pressure!

Thats only a mathematical manipulation!


Tell that to all the tornado victims who have seen the
structure they were in explode from greater pressure
inside than outside because of winds up to 200mph
or greater creating sever low pressure.

You are clueless, man. Get outside once in a while
and observe things. Sitting at your desk and reading
what professorial types have written is not serving
you well at all.

how a sail works, who can help me explain?
 

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

how a sail works, who can help me explain?
 

"Simple Simon" wrote in message ...
"Jan-Olov Newborg" wrote in message

High airflow velocity can never create low pressure!

Thats only a mathematical manipulation!


Tell that to all the tornado victims who have seen the
structure they were in explode from greater pressure
inside than outside because of winds up to 200mph
or greater creating sever low pressure.

But Dear Simple Simon, do you not even understand how a tornado works?


First you need a big CB, to get the updraft. When the the horisontal
circulation starts, it´s centrifugal/centripetal forces causing the
lower pressure to form.

Of cause, the house explodes if an airstream at 200 mph gets turned
around the house!

There will be very big low pressure gradients around the house!

That physics is very simple to understand even for Simple Simon, if
he just forget Leonard Eulers 1 D equation for a perfect, physically
non existing fluid, namely the so called "Bernoulli equation"!

Have you ever felt that it is the speed of the car that gives you the
power in the engine just as the "Bernoulli Effect" should give the
sail a force?



Jan-Olov Newborg

how a sail works, who can help me explain?
 

"Simple Simon" wrote:
"Jan-Olov Newborg" wrote in message

High airflow velocity can never create low pressure!
Thats only a mathematical manipulation!

Tell that to all the tornado victims who have seen the
structure they were in explode from greater pressure
inside than outside because of winds up to 200mph
or greater creating sever low pressure.

You are clueless, man. Get outside once in a while
and observe things. Sitting at your desk and reading
what professorial types have written is not serving
you well at all.

Ouch! Neal, I think ya got him. As someone once said, "PhDs? I've been
beating PhDs around the course for decades."

how a sail works, who can help me explain?
 

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

how a sail works, who can help me explain?
 

On Mon, 28 Jul 2003 13:02:10 +1200, The_navigator© wrote:

Remember I
said energy is ALWAYS conserved
You believe that, too? Boy, you really are weak on physics.

S/V Cat's Meow
http://www.catsmeow.org

how a sail works, who can help me explain?
 

Are you saying it isn't?

Cheers MC

Gerard Weatherby wrote:
On Mon, 28 Jul 2003 13:02:10 +1200, The_navigator© wrote:


Remember I
said energy is ALWAYS conserved

You believe that, too? Boy, you really are weak on physics.

S/V Cat's Meow
http://www.catsmeow.org

how a sail works, who can help me explain?
 

Well I ain't conserving any energy... I'll tell you that!!!!

CM

"The_navigator©" wrote in message
| Are you saying it isn't?

|
| Gerard Weatherby wrote:
| On Mon, 28 Jul 2003 13:02:10 +1200, The_navigator©
| Remember I
| said energy is ALWAYS conserved
|
| You believe that, too? Boy, you really are weak on physics.

|

how a sail works, who can help me explain?
 

The one gram loss of mass you experience after shaking your fist for
half an hour might prove (for some) that mass and energy can be
interconverted -except that the lack of gamma rays proves that it is a
sterile issue.

Cheers MC

Capt. Mooron wrote:
Well I ain't conserving any energy... I'll tell you that!!!!

CM

"The_navigator©" wrote in message
| Are you saying it isn't?

|
| Gerard Weatherby wrote:
| On Mon, 28 Jul 2003 13:02:10 +1200, The_navigator©
| Remember I
| said energy is ALWAYS conserved
|
| You believe that, too? Boy, you really are weak on physics.

|

how a sail works, who can help me explain?
 

Well, do adhesion/cohesion properties of a respective fluid play a role in
the Coanda effect? If so, are these "strings" not invisible?
Scout

"The_navigator©" wrote
Pulls? Wot with invisible strings?