No AE drivers use the Carbon center shaft anymore. It has a resonance frequency problem at high RPM. Its most noticeable in Mod. If your car is going really fast you will hear a nasty buzzing sound come out of the car. You would swear it was about to blow apart. All the factory driver use the alloy shaft now.
This can happen to belt cars too if a long loose belt is allowed to flap out of control. It used to happen to the Tam 414, the old Xpress and the Corally C4. It doesn't happen on newer belt cars because we know how to prevent it.
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series