"Morgans" wrote
But remember, stall horns are usually 8 mph before stall.

Section 23.207: Stall warning.

(c) During the stall tests required by §23.201(b) and
§23.203(a)(1), the stall warning must begin at a speed
exceeding the stalling speed by a margin of not less
than 5 knots and must continue until the stall occurs.