Recently I was thinking about adding a gas engine to my bike but in the interested of being different, or perhaps just difficult, I have started to consider building a steam engine. I've seen this on a few bikes before but usually they're huge or aesthetically unpleasing. I don't think it would need to be as big as the ones I've seen just to go 50 or 60km/h. does anyone have any background in this subject or has anyone tackled a project like this before?