A little parametric turbine. The openscad program is quite adjustable.I was not at all scientific about designing this. I just designed it look somewhat good. There are probably many ways to make it more efficient.It spins quite well if you blow into it or hold a balloon to the inlet.You can see a quick video of it here: http://www.flickr.com/photos/53725866@N07/5417888910/
---
Imported from Thingiverse: https://www.thingiverse.com/thing:6095
Original creator: jag