A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating thrust comparable to that of traditional propellers.
A toroidal propeller is a type of propeller that is ring-shaped with each blade forming a closed loop. The propellers are significantly quieter at audible frequency ranges, between 20 Hz and 20 kHz, while generating thrust comparable to that of traditional propellers.
Source: Wikipedia "Toroidal propeller" · CC BY-SA 4.0
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