Toroidal propellers look like a pair of coaxial propellers joined at their tips. While they are more difficult to manufacture physics blesses them with several advantages that, based on prototype testing, improves efficiency and reduces ...See moreToroidal propellers look like a pair of coaxial propellers joined at their tips. While they are more difficult to manufacture physics blesses them with several advantages that, based on prototype testing, improves efficiency and reduces noise. Written by
David Foss
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