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A comment on Toroidal propellers: A noise-killing game changer in air and water. Parent comment

Re:Toroidal propellers: A noise-killing game changer in air ... by julienfr112 on Saturday January 28, 2023 @02:13PM (#34560544)
the equivalent for plane wing would be to have two wings on each side connected like that :

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Re:Toroidal propellers: A noise-killing game changer in air ... by beecafe on Saturday January 28, 2023 @03:57PM (#34561773)
Those exist too! Every so often NASA tries it out.
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