ThomasHeiss Youare giving a great micro CP heli (excellent FBL with a 3G mode which is pretty direct on the stick) only a 2-star rating only because you are not able to consult RC forums like Helifreak.com or Rcgroups.com how to bind a transmitter to this BNF heli? Wow, I am speechless. A RTF transmitter shall come prebound according to other heli pilots. Maybe you have chosen the wrong model number?!? I agree, that the manual is mainly written in Chinglish, but other pilots often put more readable English instructions in the K110 threads of these two big RC forums. You may want to contact a LHS or visit a club and ask experienced RC/heli pilots how to do it. Maybe your next review shall reflect how crashbombproof this little K110 heli really is, that it has a 1s main brushless (outrunner) motor and that the FBL works pretty good. Tail hold is good, even better for inverted and backwards-inverted stuff on the longer K120 tail prop. The rating shall reflect what is all included (external 1s ESC) and that the flying experience is quite nice (I have the former K110 heli without the s). The cyclic servos can handle crashes much better than I have ever expected, especially if you do not bomb it into concrete or a hard floor / trail path. This Xk BL heli (has only a brushed tail) deserves more than only two starts!

ThomasHeiss @jarndiceLight with over 350 grams? Come on. A Xk K110 with 62 grams is light and crash bomb proof. But not this E200.

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).

ThomasHeiss Itis a Flybarless head. The three cyclic servos are controlled by the FBL unit (flight controller FC). The FBL does all the 120X/1ab24