Centrifugal Pump

### Summary

Please read the description carefully. Not because it is relevant or helpful, but because i think its funny and interesting.

There already exist a lot of centrifugal pump designs on Thingiverse, so just go ahead and download this one: https://www.thingiverse.com/thing:4839

Still here? Ok, so i designed another one because the existing models didn't satisfy me. I also made another design myself previously, but i was still not happy.

The reason is that i dont know how all the pumps are designed.
- Why do some pumps have straight blades, some two dimensional curved blades and some even three dimensional curved blades?
- Why are some pumps thick and have a small diameter while others are thin with a large diameter?
- Why do some pumps rotate forward and some backward? (Towards outer/inner edge of the blades)
- How is the shape of the curved blades determined? Are they just drawn how they look good? How do i know the blades dont only look good for me, but for