It is simple.
1) You must find whistles that spin freely and actually make a loud whistle.
cheap and have a lot of "slop" in them, and at certain speeds will lock up and
2) you must have them mounted out in the moving airstream - *NOT*
boundary layer of
The Screaming Mimi does indeed have the whistles mounted way out in the free
but they are of medium to low quality, so you are lucky to get sound out of more
of them on any given flight.
-Fred Shecter NAR 20117
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