During the summer when it's nice and warm I spend about a week getting any new plane into proper trim and work out all the bugs, this isn't anything new or unexpected. As I was walking out the door I told my wife I was expecting a crash so I guess I'm ahead of the game. I still haven't checked the plane to see the stall and I never tried a knife edge or the Cuban 8. Just the roll, loops and stall turn. The hover was just to check the power, it doesn't have a lot! It sort of acted like the battery was low but it is the weight of the plane. It was designed for up to a .20 glow engine. I used the motor and battery I had on hand. It could use a bigger one.