You know, I always sorta figured the whole model car + rocket motor idea must have occurred to other kids as well. Good to know, and a great read as always!
My brother and I were aiming for a land speed record, for our part. Took advantage of a downhill-sloping 50 foot driveway, an erector set, and C-class model rocket engines. We got in 3-4 runs, none of which went straight for more than 10 feet or so before pinwheeling.