visualisation of the lift distribution over a wing

Alan Baker wrote:
In article ,
brian whatcott wrote:

Alan Baker wrote:

Interesting comment: what would YOU call it when the fabric on the upper
wing surface wants to pull away from the ribs?
Air pressure from inside the wing pushing up on it more than the air
above is pushing down...


Let me take a wild guess he you did physics for an uundergraduate
degree. Is that right?

Brian W

No. But it doesn't matter.

If the fabric is moving upward, it can only be because there is more
pressure on its bottom surface than there is on its top surface.


It seems that you are uncomfortable with the entire concept of suction.
For example, how do you suppose suction cups work?
Or how about a suction pump that happens to be limited to a 30 ft lift?

Well duh, it's also atmospheric pressure that enables suction pumps and
suction cups etc., etc. Yes indeed , but it's an academic issue at
the junior high level, isn't it?

Brian W

brian whatcott wrote:
Alan Baker wrote:
In article ,
brian whatcott wrote:

Alan Baker wrote:

Interesting comment: what would YOU call it when the fabric on the
upper wing surface wants to pull away from the ribs?
Air pressure from inside the wing pushing up on it more than the air
above is pushing down...


Let me take a wild guess he you did physics for an uundergraduate
degree. Is that right?

Brian W

No. But it doesn't matter.

If the fabric is moving upward, it can only be because there is more
pressure on its bottom surface than there is on its top surface.


Have you ever seen the top surface of a fabric covered wing?

The skin does not bulge upwards.

Not usually anyway.

cavelamb wrote:

Have you ever seen the top surface of a fabric covered wing?

The skin does not bulge upwards.

Not usually anyway.

I find your tone impertinent.

Brian W

In article ,
brian whatcott wrote:

Alan Baker wrote:
In article ,
brian whatcott wrote:

Alan Baker wrote:

Interesting comment: what would YOU call it when the fabric on the upper
wing surface wants to pull away from the ribs?
Air pressure from inside the wing pushing up on it more than the air
above is pushing down...


Let me take a wild guess he you did physics for an uundergraduate
degree. Is that right?

Brian W

No. But it doesn't matter.

If the fabric is moving upward, it can only be because there is more
pressure on its bottom surface than there is on its top surface.


It seems that you are uncomfortable with the entire concept of suction.
For example, how do you suppose suction cups work?

The pressure outside the cup keeps it in place.

Or how about a suction pump that happens to be limited to a 30 ft lift?

Because a vacuum cannot do any actual pulling, you can only lift water
as far as the pressure allows, right.


Well duh, it's also atmospheric pressure that enables suction pumps and
suction cups etc., etc. Yes indeed , but it's an academic issue at
the junior high level, isn't it?

Yup.

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

Alan Baker wrote:
In article ,
brian whatcott wrote:

Alan Baker wrote:
In article ,
brian whatcott wrote:

Alan Baker wrote:

Interesting comment: what would YOU call it when the fabric on the upper
wing surface wants to pull away from the ribs?
Air pressure from inside the wing pushing up on it more than the air
above is pushing down...

Let me take a wild guess he you did physics for an uundergraduate
degree. Is that right?

Brian W
No. But it doesn't matter.

If the fabric is moving upward, it can only be because there is more
pressure on its bottom surface than there is on its top surface.

It seems that you are uncomfortable with the entire concept of suction.
For example, how do you suppose suction cups work?

The pressure outside the cup keeps it in place.

Or how about a suction pump that happens to be limited to a 30 ft lift?

Because a vacuum cannot do any actual pulling, you can only lift water
as far as the pressure allows, right.

Well duh, it's also atmospheric pressure that enables suction pumps and
suction cups etc., etc. Yes indeed , but it's an academic issue at
the junior high level, isn't it?

Yup.

OK you certainly cut the cookie at Junior High.
Now can we go back to using terms like suction the way 99.99% of the
technical and scientific population understands it? :-)

Brian W

In article ,
brian whatcott wrote:

Alan Baker wrote:
In article ,
brian whatcott wrote:

Alan Baker wrote:
In article ,
brian whatcott wrote:

Alan Baker wrote:

Interesting comment: what would YOU call it when the fabric on the
upper
wing surface wants to pull away from the ribs?
Air pressure from inside the wing pushing up on it more than the air
above is pushing down...

Let me take a wild guess he you did physics for an uundergraduate
degree. Is that right?

Brian W
No. But it doesn't matter.

If the fabric is moving upward, it can only be because there is more
pressure on its bottom surface than there is on its top surface.

It seems that you are uncomfortable with the entire concept of suction.
For example, how do you suppose suction cups work?

The pressure outside the cup keeps it in place.

Or how about a suction pump that happens to be limited to a 30 ft lift?

Because a vacuum cannot do any actual pulling, you can only lift water
as far as the pressure allows, right.

Well duh, it's also atmospheric pressure that enables suction pumps and
suction cups etc., etc. Yes indeed , but it's an academic issue at
the junior high level, isn't it?

Yup.

OK you certainly cut the cookie at Junior High.
Now can we go back to using terms like suction the way 99.99% of the
technical and scientific population understands it? :-)

Brian W

No one understands "suction" to actually mean a pulling force. Not since
they tried to pump water out of mines and discovered that they could
only "pull" it a certain number of feet, but no further.

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

Alan Baker wrote:
No one understands "suction" to actually mean a pulling force.


Remember folks: no more talk of sucking soda through a straw!
Just suck it up!

Brian W :-)

In article ,
brian whatcott wrote:

Alan Baker wrote:
No one understands "suction" to actually mean a pulling force.


Remember folks: no more talk of sucking soda through a straw!
Just suck it up!

Brian W :-)

Talk about it all you want...

....just don't pretend that there is a force acting upward on the surface
of the liquid inside the straw...

....because you'll be wrong.

:-)

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

Alan Baker wrote:

No one understands "suction" to actually mean a pulling force.

Remember folks: no more talk of sucking soda through a straw!
Just suck it up!

... don't pretend that there is a force acting upward on the surface
of the liquid inside the straw...

...because you'll be wrong.


You still don't get it Alan. This level of attention to minutiae is
impressive in Junior High science classes, and paradoxically is quite
correct but trivial. Get over it.

Just so you can savor the general idea - let me phrase the general
concept so it won't trip your OC reaction:
In the general case, two thirds of the lift provided by a wing is due to
the depression over the upper surface - (actually towards the front...)
and a third due to the air flow over the lower surface.

THERE. Are you happy now?

Brian W