Brand new Axe 400 5 min. old. hung tail rotors in grass at full throttle. I know nothing about Helis. The tail rotors are slipping now. If the tail rotors are moved when throttled up the rotors almost stop. Only thing I can see is the Tail Belt Drive Gear (HMXE8027) looks like it has a split in the top of it. How much slip in the tail rotors should there be? What part is suppose to slip in the tail belt drive? How do I diagnose the problem?