I am building a small quadcopter with coreless motors.
This one:
http://www.seeedstudio.com/depot/37V-50000RPM-Small-Coreless-Motor-716-p-1884.html?cPath=39_40
Speed: 50000 rpm
Rated voltage: 3.7 V
Rated current: 100mA
I think Hubsan X4 uses similar motors. So, i guess, i can get the lift...