In article , "ShawnD2112"
writes:

Chuck,
You didn't happen to video it, did you? I've been looking for exactly that
kind of footage for my ground school class to show exactly what you've
talked about.

Shawn

Sorry Shawn, I didn't but it sure would be easy to duplicate yourself. I used
8 ribbons - 4 along the lead edge and 4 aft. Actually 6 inch pieces of yarn
and a bit of duct tape at the front. Eight or ten ribbons are plenty to show
the progressing stall. Pretty obvious to see the effect as you approach stall.

Chuck