Tests with this engine included adding 3 cubes of ice, resulting in 270 RPM. Not bad for a little tea candle power source. One test provided 200+ RPM for over 4 hours with a single candle. Friction is very low and displacer height is only about 25% of height of displacer cylinder (steel wool). Goal is to make a 400+ RPM engine with a single tea-candle power source.
