Vertical climbing tank/rover
A .40 - .46 engine w/muffler is around 16-17 oz.
5 to 7 mins. @ full throttle will probably need about 8 oz. of fuel.
I agree with the others that you most likely won't get the needed amount of thrust with a 5x3.5 three blade, you'll need more prop for a .40 - .46 engine.