I used to try to build these machines in my garage when I was a kid. YouTube is full of them of course. This one is based on a 200 year old patent, and, since I just spent 50 bucks on gas, i'm assuming its just an illusion..... But why wouldn't this work? http://www.youtube.com/watch?v=RkLfpXpO5sQ&t=1m25s I'm hoping there is some physics guyz to help? Thanks!