re predator gasser tail problem

[stephenk]

Hi

Can any one help I have had the Gasser for a while now all is going well apart from when flying tight circuits from right to left then turn to the right get a whirring noise from tail and a slight movement from side to side until heli is straight then all is ok does this turning a tight left but not as half as bad.large circuits are ok

I have a futaba 401 gyro and SAB 105mm tail blades,gyro holds brilliant and no tail drifting when hovering.

I thought maybe changing the pitch slightly on the tail blades !!

Any ideas what it could be ??

thanks

Steve