Water Jet / Impeller

thingiverse

I conceptualized and fabricated this, but unfortunately, I never had a motor with sufficient power to give it a proper test, and I didn't want to invest more money in the project, so this is as far as I got. Printed in PETG (the orange parts) and PLA (the white parts), the impeller measures 55mm in diameter, making it feasible to use an RC boat prop of the same size. To mount the impeller, I obtained an 8mm nut, drilled out the thread so it slid over the 8mm rod, then I drilled a 2.5mm hole in the side of the nut and tapped it to M3. I then ground a flat spot on the 8mm shaft for the M3 screw to lock against. I then secured that all in place with thread locker and cut the top of the M3 screw off, allowing the impeller to slide over the nut, which was now firmly held on the shaft. I did the same thing with a second nut (as you can see in the picture) to prevent the impeller from coming loose. I believe that a "focusing" exit nozzle would be required to produce a significant amount of thrust, much like the rear of a jet engine. This should be a relatively straightforward design to your specifications. I used the following components: https://www.banggood.com/OD-10mm-x-8mm-ID-Stainless-Pipe-304-Stainless-Steel-Capillary-Tube-Length-500mm-p-1057416.html https://www.banggood.com/8mm-100200285320350mm-Carbon-Steel-Linear-Rail-Shaft-Rod-p-1119330.html https://www.banggood.com/5mm-8mm-Shaft-Coupling-Rigid-Coupler-Motor-Connector-With-Spanner-p-1070710.html https://www.banggood.com/8pcs-608-2RS-Bearings-8x21x7mm-Ceramic-Bearings-For-Skateboard-Deep-Groove-Ball-Bearings-p-1144805.html