Toroidal propellers: A noise-killing game changer in air and water newatlas.com Submitted by Ok_Champion6840 t3_10mvasn on January 27, 2023 at 8:34 PM in UpliftingNews 24 comments 145
BoltActionGearbox t1_j69d7kp wrote on January 28, 2023 at 6:10 PM The return of Da Vinci's air screw Permalink 1
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