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It is for this reason that in ANY helicopter that uses 400mm blades or larger, I HIGHLY recommend the use of a seperate power source for the receiver and servos in your machine, and disable the on-board BEC circuit. This power source can be a seperate 4 or 5 cell Ni-Cad or Ni-MH battery pack, or a seperate Higher current switching BEC circuit rated for 5-8 amps running from the motor battery, or a dedicated seperate 2-cell Li-Po battery with an appropriate linear or switching BEC. Failure to do this WILL lead to the eventual failure of your ESC.

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