Have installed my coal fired stainless boiler[home made and tested to 200lb] into the steam turbine launch to see how it goes!! The boiler is fan assisted [ computer fan ] and controlled by rheostat to limit draught .If you saw my video in VIDEO GALLERY a few weeks back you will see what too much draught does !!! As soon as it stops raining i will shoot some video so you can see if it worked or not !! Les Breame