In article ,
cavelamb 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.


I'm kind of curious about how that higher pressure got on the bottom
of that wing though...

If the curvature of the upper surface lowers the pressure, then even if
the pressure on the lower surface is just the ambient pressure, it will
be *higher* than the upper surface.

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