Thanks sceadwian,yes im going to use a fly wheel and tyre ,hadnt thought of the worm drive idea tho so thanks for that, you know a good place to find one big enough?out of interest as you seem fairly genned up what motor,size wheel and power source would u use if you were to build one?Most machines use 2 wheels spinning in opposite directions but i am hoping i can just use one as the whole point is to keep it simple,i was going to use a cordless circular saw and replace the blade with a tyre,im just hoping it gives me enough rpm to kick the ball out a fair distance.