Submitted by Ok_Champion6840 t3_10mvasn in UpliftingNews
drunksquatch t1_j68ynsb wrote
Reply to comment by LiverOfStyx in Toroidal propellers: A noise-killing game changer in air and water by Ok_Champion6840
The video i saw had sound for both. The guy talks over it the first few times, but eventually you do hear the props.
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