I've been bashing around my Trex for some time now and was thrilled when a guy needed money fast, and I was able to help him out by taking his incomplete Raptor Titan off his hands. I finished the Raptor with the OS Hyper engine.
I took it out to the field and ran great. I took it off and hovered it for a tank of fuel. After landing I filled up the tank again about halfway through hovering the second tank I heard a "clunk" noise and the clutch started to slip. I landed it, (was relieved to do so too!) and took it home. The two bolts that hold the clutch on had sheared. No problem I had a couple more, I couldn't get the remains of the old bolts out of the fan unit, buy TT conveniently supplies two extra holes. I locktighted these bolts into place very securely and put the engine back in. This time I waited overnight to let the locktight cure.
I took it out to the field the next day and the started her up. As soon as the engine started to fire I knew something was wrong, even at idle the blades swung around I had to catch them then I smelled a burning smell. It ran for about 15 seconds before I shut it down. The heli was covered in black dust. During the teardown I discovered the clutch lining had been completely burned out. I don't know if using the parts after the bolts had sheared or what had caused the problem.
I loved that thing in the air, and have a new clutch, clutch bell, and fan unit on order so I can fly it again, but I don't want this to happen again.

My questions are

Do you have any idea why the clutch bolts sheared? I didn't wait overnight for the locktight to cure, could this have been the problem?

What the heck would have caused that clutch liner to burn out like that? Has anyone on this forum had this happen to them before?

Thanks a million!
Ryan