Re:power requirements (Score 2, Informative)

WEll the Hawker genesis batteries are quite popular here in the UK for robotwars (we use panasonics but thats becasue we get them free), they are rated at 17Ah and so could supply 300A for 3 minutes (possibly a little longer). Also the motor is unlikely to be drawing 300A continuously. I would imagine once the weapon is spun up, unless it is very unbalanced (not likely looking at the quality of machining on the thing) then the current requirements would be much less.

Alex
http://www.firestorm2.co.uk

p.s. Design is different from building, if you don't design your build goes wrong see our robot groundhog for an example of not what to do, and Firestorm for a robot we actually spent ime desiging.