Not sure what happened, but 5 minutes in, I landed to check motor temp and noticed that the blades stopped free spinning quickly like something was binding. Took a look and the tail rotor, where the belt wraps the pulley, has grey dust accumilated on it and in the belt pulley in the frame. Tail belt has a little shredding on one side but not all the way around. Got 19 flights on thus far.
What happened?
Does it need some silicone spray on the belt?
Is the belt worn out? Looks fine to me.
Did the belt get a little too loose and try to run up high on the tail rotor pulley?