Water Jet-Drive

thingiverse

UPDATE 5/31/19 ------------------------ Began R&D on my end. Finding more time in life to work on this stuff i printed the last piece and should be doing some kind of testing in the next few weeks. This test is the 88mm impeller with a 50-65 320kv brushless. Running on 8S should give around 10K rpm and reasonable flow. Ideally we want this thing cranking around 15k and i'm really curious to see if the unit can handle the pressures of 20k. The next motor i want to try is a water cooled 55-114 at 600kv. This should handle the heat load of high amperage, and manage 15k-20k on 8S. For the people asking, this requires a BIG motor. Some of the biggest RC motors available and potentially even EV type motors. This is an 88mm impeller, its not 50mm, this borders pressures in commercial 20-30hp units, and just so requires power similar. I wouldn't even try to use any motor less than 2.5hp. Or something like 2000w UPDATE 12/04/18 ------------------------- Once again sorry for the delays everyone. At this point I have released ALL of the models associated with the drive. Due to time constraints i'm looking for some of you makers to print what you can to help me do some R&D and testing. If you're interested in this project reach out to me, i will be willing to help tailor product to certain groups and of course fix and bugs along the way. Happy printing everyone!!! UPDATE 10/11/18 ------------------------ Been on vacation in Kauai so haven't printed the scoop yet. I have successfully printed everything else and will be releasing the models for the impeller and the compression nozzle... HOWEVER I would like some feedback on a specific issue. Currently there's a need to machine the shaft so it fits the hex of the impeller. This essentially keys the shaft to the impeller. Now you'd need a machine and a decent know-how of machining tougher carbon steels in order to do this... and i think thats a little impractical for your average guy. So here's my question, do people want me to leave the hex? OR do we want me to make a D shape in the impeller so you could potentially just file a flat onto the shaft. Please give me some feedback in the comments so I can make that change and update the model. UPDATE 9/28/18 ------------------------ Printed impeller and wear ring. Only need to print the Scoop and motor brackets before I can start to assemble. I may need to print a new impeller as I don't like how the hub fits into the rear carrier bearing. (This is why I haven't released all models yet.) This weekend I should have all the models uploaded (less the scoop- that's a 50hr print) should the new impeller fit better. Will update again 9/30 with progress. 9/26/18 - Start of a work in progress. -------------------------------------------------- This is a Jet Drive Unit I have been working on for the past few months. I'm currently in the phase of printing and assembly. After that I will go into a testing and performance testing phase. This will be made from mostly 3D printed parts (even PLA) and a few purchased parts from amazon. I did do theoretical performance testing with a flowsim and even went into specific performance tweaking for this design. A 3-4kw motor should be able to crank over 60lbs of thrust out of the back end at speeds near 120fps all at around 15K RPM. This was initially intended for a Kayak project but now i'm opening it up to the public and will upload models once I have a good assembly and no more changes are needed. Certainly could be used for RC model boats of a larger size but i imagine it would be absurdly fast. Any-who i'll have a sub-assembly in the next few days and ill start uploading actual pictures soon. Feel free to offer up suggestions. Mock-parts list -------------------- **Filaments** PLA - Right now i'd say close to 1Kg Polycarbonate/Nylon - If my PLA impeller does not hold up to the pressures we will switch Ninjaflex/TPU - I am using TPU for O-rings on the wear housing. Cheetah - I am using Cheetah(harder TPU) for the vector nozzle. **Printed Part Names** Vector Nozzle - 100% finished and available for download Compression Nozzle - TBD Wear housing - TBD Scoop - TBD **Hardware** Shaft - 8mm shaft from amazon, will link if its a final choice. 8x14x4 bearings - 2 of these support the coupler-end of the shaft. 13x20x4 bearing - 1 of these supports the impeller end of the shaft. 20mm snap ring - Snaps the 20mm bearing in place. 14mm snap ring - Snaps the 14mm bearing in place. 6mm-8mm coupler - Couples the 8mm impeller shaft to the 6mm motor shaft (specific to current motor/likely to change) I should have some live testing going on later this week and into next week. If you'd like to reach out and recommend or ask questions feel free to shoot me a pm!