This is the approach [Carl Bugeja] took with his Spherical Folding Propeller design which he has entered into the Open Hardware Design Challenge category of The 2018 Hackaday Prize. While at rest ...
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This beautiful work of art is actually the biggest propeller innovation since the 19th centuryThe result is the loud noise you can hear on boats equipped with propellers ... time led to a surprising observation: the tipless folding propeller designs drastically reduced cavitation.
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