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Next time you takeoff, try this...
Years ago I did the calculations, and the blade tip speeds are near supersonic.
Bring the RPM back a hair after takeoff and you will hear that 'gnrrrrr;' dropoff instantly.
Also, the rear prop 'chops' the rear exhaust. On my T337 that's a large exhaust pipe.
But never an issue.
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David Wartofsky
Potomac Airfield
10300 Glen Way
Fort Washington, MD 20744
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