CGRetired is most likely to be correct in his assessment that the battery does not have enough capacity to sustain the load imposed upon it.

Melnick123, don't assume that "sputtering" has anything to do with it.

What you believe is "sputtering" indicates that the ESC's timing MAY be off a bit and may need reprogramming... however that is unlikely.

The ESC may be perfectly fine for your motor as is, you are just not used to the idiosyncracies of motors.


You should borrow a WATT meter from a fellow electric flyer and put it between your battery and ESC.

Then run the plane up to full throttle and observe the maximum amount of WATTS/AMPS the motor draws and the voltage.

If you are running a 3S pack, and the voltage drops to say 10.4v then the battery simply doesn't have enough power to supply the required energy to the motor.

If on the other hand your motor is rated at 200 watts and the highest draw you see on the watt meter is say 120 watts, then your prop is too small, so you are not getting enough power out of the plane.

If the motor is rated at 200 watts and the highest draw you see is over 200 watts, then your prop is too large and it may ruin the ESC, motor and battery..



All of that said, some ESC's "learn" the throttle range of the TX, and sometimes when you start changing things, the ESC may not remember the full range of the TX... in a situation such as this you must do the proceedure documented in the ESC's manual on how to retrain it for the throttle range...

I'll put my money on the battery pack issue though.