I just found a tail drive kit for the Shuttle in autorotation.

Seriously!

I found it in a box of parts at the local hobby shop. I havent seen or heard anything about such a contraption.

Its part # 0402-231 and its just a hat bushing that sits below the main drive gear and sandwiches a greased O-ring between them. I guess it acts like a torque limiter so if the tail rotor drag becomes too much the oring slips so as not to degrade the headspeed.

Its just crazy enough to work, but I'm not sure if I'm crazy enough to try it.

Anyone ever see, use, install or mess with one of these things?

I took a pic of it for reference,

Tony