Simonk 30A ESC with 5V 3A ESC FOR RC mode Simonk 30AMP 30A SimonK Firmware Brushless ESC 3A 5V BEC For DJI F450 Align TREX 250 450 RC Multicopter Qudcopter Helicopter ESC Part
30A ESC for multirotor. 
This hardware, with the SimonK firmware, gives you the perfect solution for multirotor use. 
Highest efficiency 100% N-FET design. 
No low voltage cutoff, because any cutoff in a multirotor = crash. 
No over temp cutoff, because any cutoff in a multirotor = crash. 
Super high refresh rate, no buffering of the input signal, resulting in more than 490Hz response rate. 
16KHz motor frequency, giving fastest response of the motor, and quietest operation as well (no 8KHz squeal). 
Super simple, foolproof operation! Nothing to program other than the throttle range.