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If you watch the second youtube video at the very end it shows the induced flow going right past the end of the tail boom (where the TR is). That video shows a prototype Apache with the TR on the top of the vertical stabilizer. All production Apaches have the TRs mounted low on the tailboom. At 150 knots your chances are very good of sending a flag or whatever else into the TR.
I didn't stay at a Holiday Inn express last night I happen to be a commercial helicopter pilot and do this for a living.
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Kurt
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