Kirstey
No criticism intended or implied - just wonder why and how it will be calibrated.
Given your interest in "principles of flight" as per your post, what do you think he is going to do; calibrate it against an ASI or perform a series of stalls?
The fact that it will increase the weight of the aircraft and the drag would be my only criticism, do think that TTHills has a valid point though!
About as useful as a stall warner in an aerobatic mount in my opinion.
Stik