Water Jet Pump

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This Advanced Water Jet Drive is designed for large boats, kayaks, and surfboards. This high-performance jet drive can produce a flow rate of approximately 1000 liters per minute, provided you supply it with sufficient power. After several iterations from my original design in 2013, I have finally completed this project after working on it sporadically over the years. It is now ready for public sharing. Design All design work was done using AutoCAD, but I recently re-created it in Fusion360 to take advantage of SimScale integration and conduct CFD simulations. The design consists of three main parts: inlet, middle zone, and outlet. Inlet Middle Zone This is where the magic happens, as the water is compressed slightly (from 70mm to 60mm), turbulence is reduced, and several key features are incorporated, including two water suction inlets for removing water from inside the vessel (with built-in check valves for safety) and a water inlet to cool the motor's water jacket. Outlet I have designed multiple output "nozzles" that fit this flange. Check out my other designs for more information. Flanges This has been a challenging learning experience, as I have had several instances where the flange on different designs failed catastrophically. However, after conducting extensive testing on this rig, not even a single drop escapes. The flanges are strategically located to avoid high-stress zones (particularly over the propeller), and I recommend applying a small bead (~1mm) around the entire perimeter of the female part of the flange before assembly. Power Plant This pump is not for the faint of heart, as it has increased from 500W to 2200W with an outrunner motor and now a Leopard 5698 875kV. It can produce up to 5500W, and I have even drawn 230A using an 8S2P lipo pack. This translates to approximately 7000W (at 3.8V), giving it impressive punch. Propeller The propeller was printed with ABS and has never failed me, even under massive power. I am still using my original printed propeller and plan to create pump curve RPM VS Flow rate VS Power Input for several different prop designs to tailor a solution to individual needs. The following propellers are available: * 8-Blade, 70mm OD (original) * 6-Blade * 12-Blade Shaft The shaft is made of 8mm rigid stainless steel. Shaft Support Three 8mm ID x 16mm OD sealed chrome bearings provide support to the shaft. Motor Mount A 3D printed mount with vertical adjustment allows for flexibility and customization. Shaft Coupling I used a flexible aluminum spider coupling from eBay, which effectively removes vibrations between the motor and propeller shafts. Flow Rate The calculated flow rate is approximately 1000 liters per minute. Unfortunately, I was unable to find affordable and accurate measurement tools in this range, so I resorted to creating a venturi (printed, of course) for more precise measurements. See my other designs on Thingiverse. Simulations After re-creating the design in Fusion360, I used SimScale to run CFD simulations with different propellers. You can view the simulation results on this public project (link TBA). Check out my other designs on Thingiverse: http://www.thingiverse.com/benny90/designs If you need something designed or printed, feel free to reach out through Makexyz or Thingiverse.