Consider, if you will, the humble motorboat propeller. It is small - usually 3 to 20 pounds with a 9 1/2- to 16-inch diameter - and has a simple job. Its task is to keep its head underwater and turn, ...
Every motorboat owner has a tale of hitting a submerged obstacle or boat ramp and damaging a propeller. Typically metal, it must be removed and taken to a prop repair shop, then sandblasted, bent, ...
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