Submitted by Ok_Champion6840 t3_10mvasn in UpliftingNews
UnadvertisedAndroid t1_j65zxgw wrote
Reply to comment by kracer20 in Toroidal propellers: A noise-killing game changer in air and water by Ok_Champion6840
They are being tested on drones.
LongDongWong1 t1_j6pdatw wrote
Soon to be not only noises-killing.
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