X-12B

It's a rocket car. Use your imagination xD

Or, if you don't want to use your imagination you can also check out this video:

http://www.youtube.com/watch?v=tcA4KHZOLG4

The quality is not great (and no sound, sorry about that). The one on that video is the X-12 (an earlier version) but the only difference is the nozzle.

This one was our first succesful launch with the same fuel the X-12B uses:

http://www.youtube.com/watch?v=TIAwVWGTbzU

Not very impressive, but it was a lot of fun xD