ThomasHeiss Cannotcomment if the BL tail motor or ESC is defective. But if you crash a heli of that weight and a main blade breaks it very likely has damaged the feathering shaft (spindle) in the blade holders. I do not own Scale 4-rotor blade FBL heads so I am not aware how the head is constructed internally. But check the exploded diagram and see if you can replace anything like a spindle. Normally a main shaft gets bent easily on a crash, even if the heli has much less weight. Personally I do think that the tail gyro on the FC might have got affected by vibrations not correctly driving the BL tail motor. Besides FBL controller and ESC make sure that you do not see any vibrations which might affect the 3-axis or 6-axis chip sensors on the FC and also that the tail gyro is not affected badly. Have you already checked/changed the tail rotor that it is not bent and aligns vertically when you spin it by hand? Are you sure that the one replaced main blade has a similar weight and CG like the other three? On other helis you normally have to balance the blades. Cannot know for sure how this is for this Scale heli and e.g. plastic main blades. But it may be a good idea to replace all four main blades from a new package or at least change the one defective main blade with another one (sometimes even blades from other vendors come out of the plastic bag bent, with difference weight or out of balance, or with a different CG). This will greatly generate some imbalance on the head and may affect the flight controller (FC).

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