I've been practicing hovering for the last few days. I've noticed a strange thing happening. I'll have all the controls set up so the helicopter hovers with the tail not swinging around, but then after stopping it an refueling it, the tail is all over the place. What gives? How come it's set up correctly while I'm flying it, but after I land it, shut it off and refuel it, and start it back up, the trim for the tail seems to be off?

Today I took back off and the tail started swinging around, so I had to quickly set it down. The landing was hard and the rotor hit the grass, ripping the shrink wrap on the blades. Luckily the heli was still flyable, and I continued to hover it after I checked it out.

I just want to know why the tail trim seems to get messed up on its own. The gyro is set up properly, since it works right most of the time. (just not after shutting it off and refueling)




I'd appreciate any help.