Awesome little engine! This is a very well built product. I bought this for my 11 year old nephew who likes science and anything with an engine. He absolutely loved this gift. I like it so much, I think i'm going to get one for myself too. I highly recommend!
This thing is just awesome. All you need is a little rubbing alcohol to heat the air compartment and this will run for an extrememly long time. It works just using heat, so if there was a way to switch out the glass air chamber with a metal piece you could theoretically run this using solar power with a magnifying glass or fresnel lense, no fuel source required!