I have some left over B and C rocket motors and want to build some rocket sleds. I assume the physics will be simular to a rocket car but I've built neither. Me and my wife both built a sled that will use B motors with little planning just doing what we thought would work but for the C motor I'm doing a bit more planning. My question is, does anyone know if it's better to have the thrust at the front or rear when dealing with land based rocket vehicles. These are going to be un-guided.