I'm assuming the laminar airflow over the top of the P51 wing would have quite the velocity, in a dive at least.
Notice the tiny turntable built into the wing.
Not sure if this disk would be adjustable in flight, or even how testing data would be accumulate.
Guess I have to read the paper.
http://history.nasa.gov/SP-4302/ch2.3.htm
Quote:
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Wing-flow technique of transonic testing. Models mounted on the wing of a North American P-51.
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Reminds me of testing shapes/bodies on the roof of cars.