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