The car that travels the farthest wins.
General: while you can make anykind of car, sticking wheels onto a rocket will incurr some sort of shame demerit. Similarly, sticking a rocket onto a car is equally subject to frowning.
Materials: Whatever, In the interest of safety please ensure that metal components are kept to a minimum and as safe as possible.
Weight: avoid very light cars. they are prone to spin around and shoot into the spectators and innocent bystanders.
Body shapes: The event demands something interesting to look at and shapes aimed at aerodynamics solely will be poo-pooed somehow. Formula One style, saloon car, land speed record types, all types welcome. Plus anything new you can come up with. You have to make your own chassis.
Motor types: C size rockets only in the race. Whatever the delay you like. C6 rockets seem to be cool. Only one motor to be used. No clustering or staging. You can buy them from hobby shops if you look trust worthy (swarthy types, trim beards first). These fit into a Romeo y Julieta no 3 cigar case nicely.
Wheels: Three at least but more are permissible and all must be in contact with the ground on the start line and every effort must be made to keep all on the ground during the run. A car, which is bouncing and/or whose wheels are leaving contact with the track too much, at the judges discretion, will be banned. The wheels can be inside or outside of the car body. The car must end up on all 4 wheels.
testing: You can learn alot about how good your theories regarding rocketcar design are from watching your creation pickup and fly out of contol towards someone. if you can : test your car. That said, there are 2 race categories. one for tested cars and one for first run cars.
Remote Control : is not allowed due to it working one year.
Gyroscopic control : is allowed due to it never having worked yet.