I'm building a quadcopter, (I have no experience), and I need to buy 4 motors, two will go clockwise, and two will go anticlockwise, they will need to be able to go different speeds. Ebay found this for me: http://www.ebay.co.uk/itm/Hubsan-X4...sGames_RadioControlled_JN&hash=item338461d59a With is good, but it's a tad expensive. I don't even know if I'm going to be able to get this thing to work, so I don't want to spend much money on it. So I searched 'handheld fan', knowing that they are mass produced and would be cheaper; I found these: http://www.ebay.co.uk/itm/Mini-Pock...arden_Hearing_Cooling_Air&hash=item1c286ab22b Buying 4 of these would be 3x less the price, and would include batteries (which I could use for other things, I know a quadcopter would need a lipo battery). So I have to ask, would the motors in the handheld fans be able to go either direction? And would they be able to go at different speeds? I assume applying a different voltage would change the speed, and swapping the polarity would swap the direction, but as I say, I have no experience and am unsure. So could someone shed some light on how to get some dirt cheap motors which would be suitable for quadcopters?