It has been done with some success and failure. I would imagine that the powerboat racing people would be into 3d printing props to experiment and rapidly tweak and optimise pitches and blade shapes, but maybe the strength of commonly available printing plastics just isn't there yet?Ĭlick to expand.This is not an extrapolation. This last one might be surmounted more cheaply by getting a blank for the prop printed undersize so I can vacuum bag the outside of the prop in carbon and epoxy. *Out of a reinforced plastic material that will be be strong enough. *Print a prop, or a selection of props with different higher pitches and more efficient blade shapes to fit my engine. *Tweak the pitch and blade shape (my blades are horrible weed resistant shape which was a selling point of the motor back in the day) As this engine will be designed to push boats at 3 or 4 knots.ĭo 3D design and printing companies exist that can: The next issue I will run into as I reduce the hull drag is propeller pitch. I'm now experimenting with various lift surfaces under the boat. I've derestricted the nominal 2.2 to nominal 3.3hp by the well documented removal of the restrictor washer behind the carb. I'm experimenting at the moment with a small outboard, a mercury single cylinder 2.2 hp, on a 2.4 m inflatable zodiac tender.
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