heat powered fan

I wish I had a lathe.....and skill......and time   This would be awesome sitting on top of my rocket space heater. Way cooler than the electric fan I currently use to circulate the heat  

Hello Josjor, I don't how much time you have spent on looking at these Stirling hot air type fans? I have seen some simple fan designs that people have made without the use of a Lathe, They seem to work quite well simple house hold components.