If you're serious about your quad-copters performance, then look no further than the ACK-4006CQ. Built with high-end 45SH magnets, a high pole count and custom motor mount, this quad-motor is designed purely for multi-rotor applications.

The ACK-4006CQ motor has a 4mm shaft and is supplied with a prop adaptor with a 6mm shaft. This motor has a low center of gravity and is factory balanced to keep vibration to a minimum.

Specs:
RPM/V: 550KV
Voltage: 4~5S (14.8~18.5V)
Max Current: 27A
Max Power: 500W
Idle Current: 0.56A@10V
Resistance: 0.133Ω
Main Shaft: 4mm
Diameter: 46mm
Mounting Bolt Hole Spacing: 25mm
Mounting Bolt Thread: 3mm
Weight: 68g
Rotation: CCW
Suggested ESC: 40A