| I own a Shuttle Z-TS which may be a different design to your helicopter.
On mine, the following items are in a line from the bottom up:
- Engine
- Clutch
- gear that drives the main rotor
- bearing that is seated in the main frame
- gear that the tail rotor belt is looped around
- another bearing that is seated in the main frame
- the connection that I put my starter shaft into
So there is no way for my tail rotor belt to ride up and off the gear as yours is doing.
But mine could wear throug the block (that seats the upper bearing) - although I suspect the tail-rotor belt would be hurt first.
I'd check to see if my belt was running at right-angles to the gear. If this wasn't so, the belt would ride up the slight angle and begin rubbing against one of the bearing mountings.
If convenient, I'd also look to have the helicopter checked over by friends at a local club or in the local model shop (neither option open to me currently). |