PPRuNe Forums - View Single Post - Bell 206: JetRanger and LongRanger
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Old 12th Mar 2001, 12:41
  #6 (permalink)  
The Sultan
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The 206B has a focal pylon to minimize 2/rev vibration due to inplane rotor forces. The focal pylon does allow movement both fore-and-aft and laterally. The f/a pivot is at the top of the "boomerang" and the lateral is at the bottom. Since the pylon mount(spring) is a the bottom, it is relatively easy to move the pylon by hand in the lateral direction. It is much harder to move the pylon in pitch due to the moment arm.

The Sultan