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11th May 2006 | 20:17

#9 (permalink)

AngloPepper

Joined: May 2005

Posts: 31

Likes: 0

From: Blackflies and Snow

Apache tail rotor

Totally from memory, but I think this was done for dynamic reasons to reduce (eliminate) 4T vibration. It has a fringe benefit of reducing tail rotor noise at certain aspects as well.