In article . com,
" wrote:

Here's some news that recently came out:

http://www.newscientist.com/article.ns?id=dn7867

http://abc.net.au/science/news/stories/s1439827.htm

Apparently, soundwaves can help airflow stay near the wing and increase
lift. This can help smaller aircraft to avoid stalling at lower
airspeeds. Is this a technology that could be usefully applied to
existing small aircraft? Or would it require some totally new design
thinking?

Here's a quote from the article in New Scientist (first reference above):

"In wind tunnel tests, Salmon stuck sections of plastic piezo-electric
film to wing segments. This film vibrates when an electrical signal is
applied, producing sound."

This sure sounds (no pun intended) like aftermarket stuff to me. It
might find its way into production eventually, but it sounds like you
could go stick some tweeters on your Cessna tomorrow and start landing
at 35 knots. That'd raise a few eyebrows among the line judges.

Of course, the best way to avoid stalls is to learn how to fly. No
technology in the world is going to render pilot error obsolete. OK,
I'll make one concession, for wind shear on final. It would be nice to
stay airborne when dropping through the bottom of a 20 knot headwind
layer.