Best ask Trevor of Velocerippa fame. His featherweight is the only one I know of with car steering, and from having a peek inside it looks like hes got a very good system thought up. A C5 in a feather!?! but seriously, if youve got £25 to spare just get a gold motor which would do much better in a feather, or £20 is enough for a couple of drill motors (which come with the gearboxes).