Tesla Turbine

thingiverse

This model is a smaller version of a turbine Nikola Tesla designed and claimed to have 97% efficiency. Though it may not have the full 97% efficiency, it is still a fun & useful model that you can use to power a generator or simply as a desk model. Just glue the halves together with the rotor & disks inside then put air in the intake hole (on top) and let it run.