Toroidal propellers

[gpmg762]

Saw some articles on the new type of propeller design. Wonders if someone manage to 3D print them and test it on the tello.
Articles, Toroidal propellers: A noise-killing game changer in air and water, toroidal propellers turn your drones and boats into noiseless machines

 

[HAndy]

Interesting possibilities. Let me know if you find 3D print file for toroidal tello props. Do you really think they would be light enough to be more efficient on a Tello? Would they not be heavier?