A stock Blade Nano QX runs on 6x15mm coreless motors.
The CL-0615 motors are the direct fit into the stock frame, and come with the right plugs.
The CL-0615-14 is for the seasoned pilot on the quest for adrenaline.
You can run larger motors on the nQX flight controller. But if they are too powerful, there are three problems:
- the battery connector is not capable to deliver enough current
- the autoleveling in SAFE mode will be to aggressive, and the copter wobbles/oscillates
- the throttle curve is so aggressive that the lowest possible stick position lets the copter climb
The 0720-12 motor is the only stronger motor that works in a controllable way on the nQX FC. You should use stronger batteries and replace the battery connector.