Tail vibration

[ckoelliker]

I am getting a slight tail vibration that I can not track down. It is more like a shimmy. It seems to do it about every two to three seconds. It does not seem to be gain related, and I have dropped my engine a few times to check the fan hub, clutch, etc. The vibration has remained the same. So I do not think that it is engine related, but I could be wrong. Any ideas.

[Mercuriell]

Gee - could be anything :( Check main blade balance - free running pushrod to tail - tail rotor balance - lubricate slider - try different tail blades - for starters :)

[ckoelliker]

I have done all of that with no results.