Viper R/C Copperhead ESC & VX4.39 4-Pole 540 Sensorless Brushless Motor Combo (3900kV)
[VIP6VSVX43901]

Viper R/C Copperhead ESC & VX4.39 4-Pole 540 Sensorless Brushless Motor Combo (3900kV)
Ryan Coombes - Rating: 2 of 5 Stars! Verified Owner Saturday, June 16, 2012
Performance on 3s was quite poor, tested in a Savage XS on the same gearing I tried this system (3900kv 4 pole) back to back with the traxxas Velineon (3500kv 2 pole). The traxxas system had more punch, more torque and a higher top speed. The brakes in the copperhead are aweful as well, unless you have the tuning gauge you cant get enough brakes, the first 4 profiles all had poor brakes and if you like to pulse the brakes on and off the copperhead thinks you want reverse and will trow it into reverse, not very helpful. Conclusion is, im selling it, probably replacing it with a castle system, it might cost a bit more but its worth it.
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