http://www.BuildSomethingUseful.com This is the next engine I want to share. It's very much like the first Lamina Flow engine I uploaded. The only real difference from this engine and Lamina 1 is a neodymium magnet as a counter weight and an adjustable crank shaft.
It reaches 850 rpm from a candle flame and over 1700 rpm when ran with propane. But propane is kind of dangerous as you will see in this video. I am also uploading a plans video for this engine with all the dimensions of each part.