jon wrote in
ups.com:

On 11 Okt, 22:49, "Androcles" wrote:
"CWatters" wrote in message

...
:
: "mike regish" wrote in message
...
: I think that the shape of the wing simply allows for a greater
: range of angles of attack. A sheet of plywood would providelift,
: but only at a
: very
: precise and small angle of attack.
:
: The airfoil shape allows the wing to
: provideliftthrough a much larger range of angles of attack.
:
: Well sort of.
:
: Thick wings do tend to operate over a wider range of angles than
: thin
wings
: but most subsonic wing sections will work from 0 to 10 degrees or
: more.
It's
: above 12 or 15 degrees that the section becomes more critical.
:
: A conventional wing section with camber can produce +veliftat zero
degrees
: AOA.
:
: The zeroliftangle (the angle at which noliftis produced) is
: actually negative on many conventional sections.

Ever heard ofBernoulli?
Try this demonstration:
http://www.youtube.com/watch?v=KCcZyW-6-5o
A Tomahawk cruise missile uses its wings as a control surface more
than forlift. Straight and level is useful for the computer
programmer. He thinks that way.
http://www.youtube.com/watch?v=19XXTArAGaM


All aircraft fly due to wings Angle of Attack (AOA).

All new airliners have supercritical wings and these wings have a
almost upper surface.


This web shows the vertical downwash from heavy jets, on landing at
London/Gatwick.

http://www.efluids.com/efluids/galle...plane_page.jsp

There are more of them att http://airteamimages.com/ search London/
Gatwick final

Before these pictures we only had the Cessna Citation flying over the
fog, making downwash grave.



Nope, not downwash, wake vortices,
and in fact this one nicely shows the low pressure causing fog on the
top of the wing...



http://www.efluids.com/efluids/galle...s/Morris_8.jsp



Bertie