Race Day

So we synthesized some BioDiesel for our class, and we had some fun. We used these Put-Put engines:

To make boats like this:

They work by using a vacuum to suck water into the boiler, heat it up, then it shoots out the other tub, creating a vacuum, and so on. This propels the boat forward, ta da. To see how to make one go HERE. To see a race of these things look HERE.
I didn't win by the way.