Thank you @Fruitygreen. Your Video helped me and i found the right function to do the extrusion.
@Tigerkiki: thanks for your offer. I could draw it myself by now.
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Very welcomed. Not my video but just passing the knowledge.
Built a 3D printed tool to prevent the O-rings to get “bites” from the holes.
Screws are M4, the tips are reduced to 3mm and fit into the holes in the tube. screw them into the holes in the tube before installing the end part with the seals. Add some silicone grease for lubrication.
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UPDATE:
Finished the mounting system on the windsurfboard and tested yesterday.
Reached more speed with the windsurfboard than with the SUP-Board.
Pulled 97A at 22V
How can i embed the videos?
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For this Speed is the current too much, many too much!
For this speed you need max 20 A.
Greetings Frank
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Update:
I printed a threaded nozzle outlet. So I can quickly try different diameters.
With the 35mm nozzle I have a good result. 102A (only 5A more compared to the 50mm nozzle) but more speed.
I have pulled the SUP from me and my girlfriend at the same time and reached about 10km/h. My girlfriend monitored the current during the test.
Probably tomorrow I can try the drive with the 35mm nozzle on my windsurfing board and make a video.
I am excited about the test tomorrow, but I think in winter I will build a small 500W auxiliary drive for the SUP and an efoil as well.
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Go for the eFoil, it’s so much fun. The only problem in ch is the law.
I’m a jetboarder, and having a lot of more fun than the fly’ers here. They are having a lot of problems with the water plants.they look so pissed when I’m carving away from the beach 
Today I could test the 35mm nozzle on my windsurfing board.
The result was disappointing. Not faster than with the 50mm nozzle.
Video: https://youtu.be/jEmKtzIbxag
I let the surfboard go without a person for a short time, it goes just as slow as with one person. So it makes no difference. I would have expected the surfboard to go much faster without a person. What means that the speed of the water coming out of the nozzle is already much too slow?
Video: https://youtu.be/2aC6jalPQZ4
I have found that when I lift the nozzle out of the water the thrust is much stronger. It almost pulls me along. I would not have thought that the difference between the nozzle under water and above the water surface would be so big. But I can redesign it so that half of the nozzle looks out of the water.
Video: https://youtu.be/CZCtpkvJtGU
The jet has its greatest efficiency when slightly above the water line. That’s why you got extra pull when you brought it above the water
Hi Fabian,
Noticed that you actually could surf with the MHZ 64mm. Besides the MHZ guy on Youtube and You, I never saw any success-stories til this day.
Did a board in 2018 using the full MHZ powertrain: MGM 63/400, Scorpion 7455 320kv and Jet64.
Also using the MHZ board, which is a 14kg fiberglass hollow design (not that nice really).
I coupled this with a 15s19p Samsung 25R battery pack.
I could never get this board up to plane with my 100kg weigh, neither could my 75kg wife, so I was super dissapointed after throwing 4k€+ at MHZ for something that was more a kiddie toy.
My 5yo son was the only one who could get to plane, unfortunately he only found it fun for 5mins…
Any secret mods that you managed to perform to the Jet 64 in order to get thrust enought for a grown man?
BR,
Mattias
If I am not mistaken Lampuga boards is/was also using the 64mm jets from MHZ, I would call it a proven product then…
know they did in early prototypes like 2015.
The new Boost might be MHZ 80, the stator looks familiar.
Think most brands today run 80-100mm impellers and around 50mm exit nozzle.
Nice, do you run it planing or at least >20kmh?
I have 3 brands developed in my hometown: Awake, Radinn and esurf, but you almost never see them out testing. They mostly focus on Dubai it seems.
Awake runs 100mm jet with about 60mm exit. Its the only one I’ve seen in person.
Perhaps I give it another try, but reaching only 20kmh@10kW like I did was a far cry from my experiences on efoil.
This is how my ran, looks cool for kids. Not so cool with 2m guy plowing forward with nose pointed at the sky…https://youtu.be/2Ln42S7wNAE
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My board does go faster. I’ve reached +30 KM/h with it, but it’s no fun as the board starts bouncing around.
I’m using two Surpass hobby 56102 600KV Brushless Motors each powered by 3 in parallel 6S lipo’s (so each motor is powered by a 6S3P)
The motors are doing about 13000 RPM, but can be bumped up to just under 30000 when on 12S.
( Guess what I’m building now… )
Some long time ago videos. Many things have changed after recording them.
A more resent video (sorry on Instagram)
https://www.instagram.com/p/CCySTySnHWP/
Noël on Instagram: "We (Kian and I) did some more testing with V1 of the jet board. It definitely needs to be wider at the back. We are starting with the build of version 2 soon. The 12S12P li-ion battery pack is already done, and being tested now. #jetboard #electricjetboard #esurf #esurfboard" (Board is not running full speed)
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Hi
You are using the motor from MHZ and the ESC from MGM, can you deliver a logfile?
Secrets…puuh, it is really hard with the 64mm jet to reach 30 km/h or more…
I have thought about to create a new impeller with 3 blades and reduce all the gaps to a minimum.
But still if I compare the MHZ Jet with the jet of my Jetsurf, these jets are completely different.
Please send some more info
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Me? Using a motor from MHZ and a ESC from MGM?
No…
I’m using two (2) Surpass hobby 56102 600KV motors and two (2) 53mm jets in the board.
The impeller is 3 blades.
ESC’s in this board are from Flier. Model: ESC 240 16S
cim96dm7, was the one I mentioned 
sorry my fault…
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