Old 11-13-2018, 02:15 AM
  #43  
gunradd
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Location: Springhill, FL
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The RollsRoyce enigines on our helicopters have a harmonic issue at a certain RPM. The fix is to avoid staying in that RPM range. When I was at the factory they had a turbine wheel they would tap and it was like a tuning fork.

Have fun over their in your trip Barry.
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