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

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

Description

Join the official M-Jet facebook group! https://www.facebook.com/groups/623045356071128

Propulsion system for DIY electric surfboards.

Basic PDF manual: https://drive.google.com/file/d/1WgkuZUZwO3yLBlEEI8PD1eNt4OGTMnqZ/view?usp=sharing

Includes part list, print settings and basic assembly and installation guide.

You get 8 STL files for 8 parts of the jet drive, designed to be FDM 3D printed on any conventional 3D printer. You also get a STEP file of the whole pump, ready to be edited to your needs. You can 3D print it, assemble it with the help of a basic manual. Use two pumps to make your own electric surfboard.

The M-Jet 60 project originally started as a collaboration with the intention to produce the pump physically. The collaboration ended, and therefore I as the designer, decided to sell the design on its own and enable people to build the pump themselves.

The design is heavily based on my previous M-Jet 30 pump. Main features are 2-stage configuration (2 impellers in a row), integrated motor mount, integrated watercooling, intake grate, thrust bearing, simple impeller mounting system, rear installation. The pump achieves 20kg thrust on 14000 RPM.

Update 24.02.2022: A folder Mods_for_M-Jet_60 with a modified housing with no intake grate was added to the files.

Update 23.05.2022: A single stage mod was added to the Mods_for_M-Jet_60 with modified first impeller and second stage to work in a single stage (single impeller) configuration.

Update 3.6.2023: STEP file of the whole pump was added with the M-Jet_60_STEP_file folder.

L
lecqamaury 2024-08-13 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-Development 2024-08-13 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
L
lecqamaury 2024-08-14 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
M
moretonbaykiting 2024-03-03 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-Development 2024-03-03 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.
M
moretonbaykiting 2024-03-03 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?
K
krokoman 2023-12-03 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-Development 2023-12-03 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:)
K
krokoman 2023-12-04 06:45:54 UTC
Hi, thank you for your immediate reply. I will try to find some other solution. Congrats to your great design.
M
martin5 2022-12-09 10:51:00 UTC
which fitting did you use for cooling ? 3/8"
M-Jet-Development
M-Jet-Development 2022-12-09 14:04:41 UTC
We used a M5 threaded insert with a threaded M5 cooling nipple. A 6mm aluminum pipe can be used instead.
M
martin5 2022-12-10 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-Development 2022-12-10 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.
Item rating
9 0
H
humle777 2024-03-10 16:11:02 UTC
Recommended
This was my first purchase of a 3D design product. I must admit I am amazed so far! Status is the files has obviously been downloaded successfully, and 8 out of 10 parts are printed and looks really nice. Parts oriented optimal to achieve the best result (I was told by the friend who printed it for me). Only the impellers came out with a small "beard" since we missed that the designer advised to use supports. Should be an easy fix to clean off. I am eager to put it all together and has now purchased all parts, such as bearings, o-rings, screws, etc. - waiting for it all to arrive an assemble it. The description that came along was just a bonus. It includes important details for the assembly in addition to advise on selection of motor, ESC and battery voltage. So far this was a bargain and I am ready for another purchase if this is the quality to expect. Once all put together I will see if pictures etc. can be shared with you all.
C
cliffe 2024-01-21 16:58:29 UTC
Recommended
So far really pleased, I scaled it up by 25% but not yet finished my project so cant test it.
M
mbemy 2022-11-23 02:24:28 UTC
Recommended
I'd like to rate neutral, was hopeing to see the single stage impeller mod incorporating work done on the M35.
M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards
$10.00
 
Editorial No Ai License 
M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards
$10.00
 
Editorial No Ai License 
Response 94% in 1.9h

3D Model formats

Format limitations
  • Stereolithography (.stl) (3 files)9.74 MB
  • PDF (.pdf)3.58 MB

3D Model details

  • Publish date2022-02-21
  • Model ID#3599074
  • Ready for 3D Printing
Help
Chat