This 40A speed controller is a good affordable solution to power your brushless motor.
40A: Size: Approx.68 x 25 x 8 mm Weight: Approx.39g Working current: 40A Maximum current: 55A (10 seconds) BEC: Yes, 2A / 5V Applicable battery type: 2 - 3 Li-Po, or 5 - 9 Ni-MH / Ni-Cd Maximum speed: 2 pole motor 210000 rev / min, 6 pole motor 70000 rev / min, 12 pole motor 35000 rev / min
Safety arming feature: Regardless the throttle stick position, the motor will not spin after battery connected. Throttle calibration funtion: Throttle range can be calibrated to be compatible with different transmitters. User programmable - Multiple program methods supported such as transmitter stick, LED Program Card. Compatible with Lipo and NiMH battery. Timing can be changed to be suitable for different brushless motors. Full protection: Low voltage cutoff protection / Over-heat protection / Throttle signal loss protection.