Good evening respected friends, after my leave, i am back in duty, so 400 kms from my home town.by yesterday, i was waking along the street here, and found an amazing toy boat..it was nothing but a pressed steel sheet in to hull shape, and there was a cover at front, like a bonnet.i bought two of them, for half a dollr.inside it, there was nothing, but a caplike thing with a lid, and two tubes was going out of the hull to back.at first we have to fill some water through the tube and place a wick lamp under the lid. so boat will start to run with a phat, phat noise..its too fascinating..so when i am back home willing to make a craft like this.so i need a good knowledge about this kind of propultion.is there anyone , can explain me about its working principle..? its a kind request..some helpfull links also welcome..i tried in google but was desperating...please..