Two side-thoughts that might shock some people:
* I once saw a cartoon drawing of a Cessna undergoing this operation from a short-skirted lady student - and with a broad grin drawn on the engine cowling
* a properly trained pilot does not need this kind of gimmick at all. An approaching stall is felt in the seat of the pants (or skirt) and should trigger a warning automatically and instinctively.
[later addition, @below: admittedly, I can only speak for benign low-performance planes. Things may indeed be different on more demanding planes]
Last edited by Jan Olieslagers; 18th March 2021 at 17:54.