M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards 3D model 3D printable

lecqamaury

lecqamaury2024-08-13 08:53:27 UTC

Hello, I'm thinking about building an electric surfboard, and I'm wondering if 1 water jet is enough or if two is better, like the rclifeon video about his electric surfboard (https://youtu.be/YsDMwh7Mw-8). He's using two of these but apparently his 500kv motors are too high for 48v because of overheating and bad efficiency.. You've written on the PDF file that the maximum unloaded RPM should be 20k rpm, but is it because of structural limitations on the propeller or because of the water not going through the impeller at this speed ? Because I wanted to print the propeller in aluminum via PCBway SLM, so maybe I can use a higher kV motor to have more thrust ? And so use only one water jet and save money. My plan was to use a sss motor 56123 250kv (or more depending on your answer) with a 72v battery pack. You've also written that a 14k RPM you get 20kg of thrust, is it enough for a jet surfboard ? Thanks if you read this it would help me a lot ! Hope my English is ok ;)

M-Jet-Development

M-Jet-Development2024-08-13 09:20:09 UTC

Hello, Using just one M-Jet 60 will not be enough to get you going on an electric surfboard. You need 2 to get up to speed. The maximum unloaded RPM is suggested as 20k to protect the motor. Choosing higher KV and therefore higher unloaded RPM will lead to overloading the motor, because the pump demands a lot of torque. Yes, 500kv on 48V is quite a lot and the setup is probably not running the most efficient way. If you get the impeller printed in aluminum, I think it can technically survive even more RPM, but the motor will not be able to provide enough power. However I think a 56123 250kv on 72V is a great setup, 18000 unloaded RPM is perfect and the motor will have enough torque. You'll just need two pumps. Stepan

lecqamaury

lecqamaury2024-08-14 16:07:12 UTC

Thanks a lot for your good and fast help ! I didn't thought it was to "protect" the motor.. but it's interesting and so I checked your YouTube channel, you're doing a really nice job and it helped me understand things I didn't know or understand correctly. But, even if my motor can pull 6500w continuously and 7800w max in 72volts (I think) to avoid overAmps load on the motor, but it's still a lot, I mean I think, and it's more than rclifeon Wich is 3800w continuously and 6500w max. Does this allow more torque ? So maybe the ability to spin faster the prop, without overheating? I hope I doesn't bother you much because I'm still learning about all of this .. Again massive thank you

abdallahazawaneh

abdallahazawaneh2024-04-28 15:39:29 UTC

Nice!

moretonbaykiting

moretonbaykiting2024-03-03 20:59:44 UTC

Hi, M-Jet looks great. I'd like to use it as a bow thruster for a large, though very light, vessel. 20kg thrust would be adequate. A commercially available solution (https://www.jetthruster.com/webshop/-c52919289) runs a single jet through a Y valve to allow it to move the bow in either direction. Are you aware of any such implementation with M-Jet? I wonder how much thrust is lost as a result of the jet having to be routed through 90°?

M-Jet-Development

M-Jet-Development2024-03-03 21:35:46 UTC

Hello, I haven't designed anything similar to the solution you posted. Because the pipe diameter is still fairly small, I assume there must be quite some pressure loss both in the pipe and in the 90° elbow. Their solution features a centrifugal pump, which generally produces higher pressure difference at a given flow rate. Thanks to the centrifugal pump they are probably able to overcome the pressure loss in the pipes. However, the M-Jet 60 is an axial pump, designed for lower pressure differences. Attaching any pipes to it might result in poor operation.

moretonbaykiting

moretonbaykiting2024-03-03 21:56:49 UTC

Thanks for your prompt reply. I'll investigate further. Two thrusters, facing each direction, with limited pipe work, maybe an option...but one I had hoped to avoid. What immersion depth is required to allow the pump to be primed?

krokoman

krokoman2023-12-03 12:48:56 UTC

Hi. I am interested in having 2 of this motors installed on a big boat 8000kg of weight. I want it to be able to achieve a speed of 10-15 knots. Do you think i should have the dimensions increased or the mentioned 20kg of thrust would be sufficient? Thanks

M-Jet-Development

M-Jet-Development2023-12-03 13:41:27 UTC

Hi, 8000kg of weight is about 80 times heavier than what this pump can push. So unfortunately this is not a good choice for your purpose:)

krokoman

krokoman2023-12-04 06:45:54 UTC

Hi, thank you for your immediate reply. I will try to find some other solution. Congrats to your great design.

martin5

martin52022-12-09 10:51:00 UTC

which fitting did you use for cooling ? 3/8"

M-Jet-Development

M-Jet-Development2022-12-09 14:04:41 UTC

We used a M5 threaded insert with a threaded M5 cooling nipple. A 6mm aluminum pipe can be used instead.

martin5

martin52022-12-10 07:35:25 UTC

the nipple hole is 6.3mm big, how can i use a 6mm plug or M5 insert

M-Jet-Development

M-Jet-Development2022-12-10 08:09:30 UTC

I mean the M5 brass threaded insert you use in all parts of the build to attach screws. Then screw a M5 cooling nipple with thread locker into the threaded insert. Also a 6mm aluminum pipe can be glued in using epoxy.

M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards 3D print model

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M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards

M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards 3D print model

3D Model formats

Format limitations

3D Model details

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