Originally Posted by
slacktide
How about this - you could drill a hole in the leading edge of the wing, slightly below the stagnation point. Using some flexible tubing, you could connect this hole to a kazoo or harmonica mounted in the cockpit. At a high angle of attack, the stagnation point will move below the hole, and a vacuum will exist at the hole, drawing air through the tube and sounding the kazoo.
You could even test it during pre-flight by applying oral suction. One would presume that this would be an FO task.
What you have described is the old Safe Flight stall warning system which used a moveable vane at the stagnation point instead of an orifice. This stall warning system has been around light aircraft since about 1946 or so.
Cheers,
Grog