Sorry to double post but if I buy one of these:
http://firgelliauto.co.uk/product_info.php?cPath=84&products_id=73http://firgelliauto.co.uk/product_in...products_id=73
and double the voltage, will I get double the lifting capacity? In my opinion 40kg of thrust is enough (itll lift two robots plus the arm) and it is pretty quick.

Thanks,

alex