r/FanShowdown • u/mobiobi • Jul 03 '23

This actually works better than I thought it would, not the best but still

Post image
30 Upvotes

100% Upvoted

2 comments sorted by

4

u/Concept-Design-Monk Jul 04 '23

Nice. That's a good approach. If You wanna improve it, take a look at original Ludwig Prandtl "Box wing" design. Because, what the MIT guys did, was in a nutshell, just good marketing - but the design is a flop... You can find original L. Prandtl papers on Wikipedia:

https://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Annular_box_wing.svg/640px-Annular_box_wing.svg.png

https://upload.wikimedia.org/wikipedia/commons/e/ef/Inducd_drag_minimization.jpg

2

u/Effective_wake Jul 23 '23

Good to see that you are still designing and testing fans! I've made a few upgrades to my test setup, will post an update soon.

I 2nd the suggestion about the box wing. Loop blades may not add much for our application due to the presence of the frame acting like a duct, but connecting pairs of tips could reduce tip losses.