For a science project three years ago, I built a car powered by model rocket engines. The first model was cut from a pine wood derby car blank, and used 1/4 A engines. The final design I used was a modified version of a balloon powered car I built for a previous science project, with a balsa wood frame, and CD wheels. CD's apparently do not hold up very well when spinning very fast on rough asphalt, but I had enough spare wheels to do a few launches. Although I no longer have any of the data I recorded for the project, or any of the pictures I took of the car, I do have the video's of the launches: