Hélice toroïdale

• https://en.wikipedia.org/wiki/Toroidal_propeller

• Toroidal Propeller https://youtu.be/E8L8I0dLh_o 3' video, bien

• https://www.ll.mit.edu/sites/default/files/other/doc/2022-09/TVO_Technology_Highlight_41_Toroidal_Propeller.pdf doc associé à la video ci-dessus

• https://newatlas.com/aircraft/toroidal-quiet-propellers/