Depends on the aircraft. On a Cessna or the like there's a tab that is
normally pressed down by its own weight and by dynamic pressure, but
when angle of attack becomes high enough the low pressure area moves
forward far enough on the wing to lift the tab, activating the warning.
On an aircraft with an angle of attack sensor, the angle of attack
sensor would be the primary means of sensing an impending stall.
Not sure how one could get an effective stall warning from the
difference in pressure between the pitot and static ports, all that
gives you is airspeed.
In any case the incident occurred on a ferry flight during WWII, and the
stall warning horn was not invented until sometime around 1947.
If you're in discourse with Clarke, you're being trolled.
Ask not what the world needs. Ask what makes you come
alive... then go do it. Because what the world needs
is people who have come alive. -- Howard Thurman
Heard and Saw one of those on a landing at LA from Santa Barbara. Little
prop commuter with curtains for the door to the flight deck. We must have
hit the wash from a big jet. Was real sphincter control watching the pilots
wrestle us onto the ground in one piece. Some superb flying ...
"He's not the Messiah. He's a very naughty boy! "
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