On Jan 25, 9:51*am, Frank Whiteley wrote:
http://www.physorg.com/news/2012-01-wings.html

The video appears to be made with a desktop 2D smoke tunnel commonly
used in WW2 pilot training. After the war these devices found their
way into high school science labs. They were never intended to be
anything more than a qualitative visualization tool since they
operated at a Reynolds number far too low to be meaningful for full-
size aircraft. However, they did produce a convincing illustration of
flow separation at stall as the little airfoil shape was rotated to
increase the angle of attack.

The little smoke tunnel was composed of two glass plates about half an
inch apart and about 10" square sealed top and bottom. An electric
fan pulled air horizontally through the space between them at a couple
of feet per second. At the intake side, a kerosene smoke generator
comprised of an electrically heated pot of kerosene fed smoke into a
"rake" made of thin brass tubes which produced the neat parallel
streams of smoke. There was a finger operated valve to "pulse" the
streams of smoke. Various shapes could be placed in the "test
section" and rotated to any angle to help students visualize the
airflow around them. There was also a lamp house and lens which
converted the "wind tunnel" into a projection system so a classroom
full of seated students could watch the demonstration.

They were huge fun to play with but the EPA would never approve the
air pollution they produced in a classroom.