This is the weirdest engine I have ever seen
Source: http://sploid.gizmodo.com/this-is-the-weirdest-engine-i-havee-ever-seen-1605020251/+jesusdiaz
According to Duke Engineering, their axial engine is the most efficient and lightest engine you can put in boats, light aircrafts, and generators—the mechanical engine of the (near) future! Maybe. I don't know if their claims are true and I don't really care. I just love watching it in action in this eternal gif.