propeller with duct
grabcad
A propeller with a duct, optimized for 3D printing, has been developed to provide maximum thrust of up to 14 knots at an ideal RPM range of 1800-2500. The creators spent numerous hours perfecting the propulsion system and have shared their experience in this Facebook album (https://www.facebook.com/nikolai.hiorth/media_set?set=a.10159438659855144&type=1&l=2e97c1f9fb) and on Instructables (https://www.instructables.com/id/Building-an-ELECTRICAL-Hydrofoil-Part-12/). The duct significantly enhances the performance of this efficient propeller. ---
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