This week I took a cheap RS RC truck body off and stuffed in 9 "sub C" nicads from a Dewalt batt pack. Stock form was 8 AA cells.
It can't get out of it's own way now. You have top feather the throttle to start.
Then we pimped it out with some cardboard disc covered with aluminum foil hot glued to the wheels plus a big hood scoop, rear wing.
All this inspired by a three yr old staying with us this week.
Tonight we launched wads of soaked paper towels stuffed into the neck of 2 liter coke bottles by stomping on them. Shot the dog down the hall.
Man, is he going to be spoiled when he gets back this weekend.