I say use the Huge "G" rocket motors. They are absolutely nuts. Get about 5 of those. THen get 5 "E" rocket motors, and tape those behind the "G" motors so that once the "E" motors run out, they explode, which ignites the "G" motors. The "E" motors will get the running start it needs. Then the G motors will make it go so fast, it'll probably go airborn.