visualisation of the lift distribution over a wing

"Alan Baker" wrote

Anyone who thinks that the pressure of a fluid on a surface can act in
any direction but towards the surface is simply wrong.

I see. You are not lookng at the wing as a system, but taking an
observation at one point only, without reguard to what is happening around
it.

Point made.
--
Jim in NC

Morgans wrote:
"Alan Baker" wrote
Anyone who thinks that the pressure of a fluid on a surface can act in
any direction but towards the surface is simply wrong.

I see. You are not lookng at the wing as a system, but taking an
observation at one point only, without reguard to what is happening around
it.

Point made.

He looked inside the wing, at the entire upper surface, at the lower
surface... that pretty much covers most of it. Air can't be in tension.

Beryl wrote:
Air can't be in tension.

If it had a stressful day it might become tense. Air can be under a lot of
pressure at times, and work can cause it to get hot. Put under too much
pressure, air can blow a gasket.

That's why it's best to let air blow off steam after a hard day at work and
maybe offer it a smoke with a gin and tonic to cool off:

http://www.bobblum.com/Images/Humor%.../subgenius.jpg

Jim Logajan wrote:
Beryl wrote:
Air can't be in tension.

If it had a stressful day it might become tense. Air can be under a lot of
pressure at times, and work can cause it to get hot. Put under too much
pressure, air can blow a gasket.

That's why it's best to let air blow off steam after a hard day at work and
maybe offer it a smoke with a gin and tonic to cool off:

http://www.bobblum.com/Images/Humor%.../subgenius.jpg



I think it's about time for a little remedial aerodynamics for the group.

http://www.messybeast.com/dragonqueen/liftdemon.htm



LIFT DEMONS AND THRUST PIXIES

Title of Paper: The Role of Lift Demons and Thrust Pixies in Heavier Than Air Flight

Publication Date: 2004

Abstract: The role of Lift Demons in aeronautics was first explained in 1994 by
Mary Shafer (NASA). Since then, Shafer's work has been explored and revised.
This paper summarises advances in Lift Demon technology over the last decade.

Keywords: Lift Demons, Thrust Pixies, lemon fondant

Authors: Sarah Hartwell, DEF Smith, Peter Rieden, Gavin Bull

"Beryl" wrote

He looked inside the wing, at the entire upper surface, at the lower
surface... that pretty much covers most of it. Air can't be in tension.

Yes, but the person that observed that the pressure on the bottom was one
third responsible (for lift) and the low pressure on top was responsible for
two thirds of the lift is also correct, when you look at the wing as a whole
system, even if those fractions are approximate.

I think his view of individual points of observations are splitting
toadstools.

But that is my opinion, and like everyone, we all have but-holes and
opinions.
--
Jim in NC

In article ,
"Morgans" wrote:

"Beryl" wrote

He looked inside the wing, at the entire upper surface, at the lower
surface... that pretty much covers most of it. Air can't be in tension.

Yes, but the person that observed that the pressure on the bottom was one
third responsible (for lift) and the low pressure on top was responsible for
two thirds of the lift is also correct, when you look at the wing as a whole
system, even if those fractions are approximate.

Which I correctly identified if the OP meant it in the appropriate terms.


I think his view of individual points of observations are splitting
toadstools.

But that is my opinion, and like everyone, we all have but-holes and
opinions.

--
Alan Baker
Vancouver, British Columbia
http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg

"Morgans" wrote:


I think his view of individual points of observations are splitting
toadstools.




But that is my opinion, and like everyone, we all have but-holes....

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Too much information, Morgans. :-)

P.S.
YOU may indeed have a "but-hole, BUT....
expect the major to anatomically have
"buttholes, butt-holes or butt holes".

MERRY CHRISTMAS all.


Barnyard BOb - gone flying

"Barnyard BOb" wrote
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

Too much information, Morgans. :-)

P.S.
YOU may indeed have a "but-hole, BUT....
expect the major to anatomically have
"buttholes, butt-holes or butt holes".

MERRY CHRISTMAS all.

So nice of you to stop it, butt is that all you have to contribute to
increase our collective wisdom? (I left an extra "t" back there for you to
use when you need one )

Speaking of butt-holes, where is one when you need one? g

Merry Christmas to you, and yours!
--
Jim in NC

P.S. Nice to be back like the old days, for a moment or two. ;-)

In article ,
"Morgans" wrote:

"Alan Baker" wrote

Anyone who thinks that the pressure of a fluid on a surface can act in
any direction but towards the surface is simply wrong.

I see. You are not lookng at the wing as a system, but taking an
observation at one point only, without reguard to what is happening around
it.

Point made.

Nope.

I'm making the point that the upper surface contributes absolutely *no*
lifting force.

None.

Zero.

In fact, it provides a downward force. Every time.

--
Alan Baker
Vancouver, British Columbia
http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg

Alan Baker wrote:
In article ,
"Morgans" wrote:

"Alan Baker" wrote
Anyone who thinks that the pressure of a fluid on a surface can act in
any direction but towards the surface is simply wrong.
I see. You are not lookng at the wing as a system, but taking an
observation at one point only, without reguard to what is happening around
it.

Point made.

Nope.

I'm making the point that the upper surface contributes absolutely *no*
lifting force.

None.

Zero.

In fact, it provides a downward force. Every time.



Sorry, Alan, old boy, I find must disagree.

In actuality, BOTH surfaces are below ambient pressure.
('splain why?)

But without that reduction of the pressure across the top curve of the wing,
the pressure below it can't do much at all, can it?