When the N7 is placed on level ground the tail fin rests on the ground, as if it's too long. I'm sure it's something I've done but for the life of me, I can't figure out why it touches the ground. It's not a good thing, especially when spinning up the main blades because the vibrations is crazy. Once the air, the model is smooth as glass. Any comments on what I may have done to make this happen.