2
2025-05-03 02:16:18 UTC26lmansfield
Do you think using two EGO POWER+ 56-Volt, 5 Ah 5 Ah Lithium Ion (Li-ion) Batteries would be suitable to power both pumps for a sufficient amount of time?
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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.
M-Jet-Development
This battery looks too small and I am not sure if the Li-Ion type can provide enough discharge current (expect maximum current ranges 200-300A).
I would suggest looking at for example 6S 10 000mAh and running 2 of those in series.
2
2025-04-30 23:31:00 UTC26lmansfield
Do you only need one ESC for both motors?
M-Jet-Development
No, each motor must have its own ESC.
2
2025-04-29 14:19:29 UTC26lmansfield
Do you think if you scaled the pump up, you could use just one to power a surfboard?
M-Jet-Development
Firstly, scaling the pump up brings complications. All fastener sizes, bearings, shafts, seals, motor mount, servo mount all become incompatible and possibly generating non-existing requirements for dimensions of these parts. Solving this requires a lot of additional effort.
Secondly, if you scale the pump up, you need an accordingly more powerful motor and accordingly lower KV.
In our application, KV should scale with (-0.5)th power of size. Power requirement scales with 3.5th power of size. Static thrust scales with 3rd power of size.
This means for example: 1.2x size -> 1.73x thrust, 1.9x power, 0.91x KV.
If you do both of these steps successfuly, then you can use a single pump to run the surfboard and possibly have better results than with a single pump.
Let me know if you need some more help with this, feel free to send me a private message too.
Stepan
2
2025-04-29 13:24:47 UTC26lmansfield
Could you please send a link to the motor and battery you recommend for your design? I'm making a jet-powered surfboard, but I am a little confused about what motors and batteries to get.
J
2025-01-14 14:28:46 UTCjan-philipp-weber
Hi, I bought your jet propulsion data and am currently planning a jetboard. I want to use three jets to make the board very powerful.
For the battery, I plan to use a 12S Li-ion 44.4V pack. However, I’m unsure about the motors. RClifeon used SSS 56123 500kv motors to build a fast board, but it runs quite inefficiently.
He mentioned that with his 44.4V 16Ah batteries, he rides for an average of 3 minutes, which means a consumption of around 14kW!
Especially considering that my Jetsurf board with a 100cc engine reaches around 60 km/h with approximately 8 kW.
I would like to build the board more efficiently, so I'm considering using 360kv motors. The question now is whether I can still reach my desired speed of 50 km/h with these 360kv motors, which have a no-load speed of 16,000 rpm.
Have you ever measured the jet velocity? I’m concerned that while the 360kv motors might generate enough thrust, the jet speed may not be high enough.
Do you perhaps have a completely different motor recommendation for me?
Additionally, I’d like to know if the jet propulsion system is fully waterproof. I’m considering using a shaft seal instead of the O-ring.
Best regards,
Jan
M-Jet-Development
Hi, there are multiple considerations to be taken into account.
1) The 360KV motors will indeed run more efficiently than 500KV motors, but they will also produce a bit less power output.
2) The M-Jet 60 on 44.4V powered by sufficiently large 360KV motor will achieve around 20kg static thrust at approximately 40kph exit velocity. Such setup will likely consume around 4000W per single pump, so 12000W in total.
3) Despite using 3 pumps, the exit velocity will be limiting, and I don't think 50kph is achievable. RCLifeon did 44kph with higher KV.
I have some different options to suggest. The M-Jet 60 was developed in 2021, and since then the M-Jet designs advanced. The M-Jet 30 and M-Jet 35 are designed for RC boats (30mm, respectively 35mm impeller diameter), but they have features which make them more efficient. You could buy the M-Jet 30 or M-Jet 35 and scale it up to 200%.
There are many problems arising if you attempt to change scale of any M-Jet design.
All fastener sizes, bearings, shafts, seals, motor mount, servo mount all become incompatible and possibly generating non-existing requirements for dimensions of these parts. Solving this requires a lot of additional effort. The M-Jet 30 and M-Jet 35 come with a STEP file which includes all parts *except* for the first stage and second stage. If you work with CAD, you might be able to modify some dimensions for bearings to make it work.
Eventually this can result in a better pump than the M-Jet 60 and achieve your goal.
Stepan
M-Jet-Development
M-Jet 30:
https://www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-3d-printable-jet-drive-for-rc-boats
M-Jet 35:
https://www.cgtrader.com/3d-print-models/hobby-diy/other/m-jet-35-3d-printable-jet-pump-for-rc-boats
C
christopherplewis
A
angelocolelli9
Great instructions included for a next toperfect print and if you have any questions he responds quick
W
wjb909z
Prints came out great on my ender v3 SE. Solidworks file is very helpful for the school project we’re doing.
H
humle777
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
So far really pleased, I scaled it up by 25% but not yet finished my project so cant test it.
M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards
Editorial No Ai License
M-Jet 60 - 3D Printable Jet Drive for Electric Surfboards
Editorial No Ai License
3D Model details
- Ready for 3D Printing
- Publish date2022-02-21
- Model ID#3599074
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