Fascinating demonstration of the importance of determining the proper line of thrust in such applications! My favorite was the one where they "drag raced" the two rocket powered Mini Coopers off side-by-side ramps. The winner actually leveled out in a preposterously stable attitude and even gained a bit of altitude before running out of moxie. > > They were used in the twelve 6" motors we made for the Myth Busters > 'JATO 3' episode: > http://www.youtube.com/watch?v=cHUsGFGhfmk Cheers, Mark L. DC