raptor going round and round
If it was set up in reverse it would spin uncontrolably in one direction. As the gyro try's to corect itself it gives an input to the servo but since it's reversed it's going against itself untill it has full throw to one side. If it's a gain issue is will slowly spin. Or if he has the push rod set incorect, to long or to short it will also drift slowly. I think if he was able to still land it it was more of a gain issue. He probably has a cheap peizo gyro so his revo mixing could be out of wack too.