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  1. S

    Electric Surf Board

    Hello, i.materialise writes: I scaled my impeller accordingly and got a good result. For the shaft I made the hole smaller then needed and drilled it afterwards to the right size including screw thread.
  2. S

    Electric Surf Board

    I have a 3D printed steel impeller. Ordered it at i.materialise.com There you can upload your file and instantly get a price. The print quality is impressive
  3. S

    Electric Surf Board

    I thought the boost has an Torqstar 3 7050. Is it an inrunner on your pic of the boost motor ?
  4. S

    Electric Surf Board

    Pitch is 60mm. My biggest issue is the sealing of service hatches. Do you guys have good solutions for that ?
  5. S

    Electric Surf Board

    how about your water inlet ? My prop is 60mm. This could be too small :idea:
  6. S

    Electric Surf Board

    I was not surfing on it at full throttle yet. When I sit down on it, it is more like a submarine and cannot accelerate :confused: My nozzle has 50mm at the end. How about yours ?
  7. S

    Electric Surf Board

    Did some water tests. Two major problems: 1. Sealing of my polycarbonate glasses is not good. Had water in my board, thats why I had to stop testing. 2. I am too heavy :oops: In my design phase I thought that it will produce enough lift when accelerating. So I designed 100l of volume. The...
  8. S

    Electric Surf Board

    I did some progress and now only wait for vacation to do some water tests. I especially modified my batteries. Now running on 48 pcs 20700 liion cells, 12S4P. Each parallel pack with own 60A BMS. I also build a power distribution board, where I put in all battery packs and charger (for...
  9. S

    Electric Surf Board

    hello guys, i am still testing in my small pool. now my remote control is working fine. Also the new propeller is doing a very good job. here my current MGM log. I wonder that I have really small power consumption at 10.000 rpm. At the moment I limited the MGM to 10k rpm for testing. Will try...
  10. S

    Electric Surf Board

    I ordered a 62x62mm. They said that it will shrink 2-3% after thermal treatment and finally I got a 60.5 x 60.5 impeller. It is ~95€.
  11. S

    Electric Surf Board

    Hello toto, the pitch is 60mm or equal to D if you scale it. I have not balanced it yet.
  12. S

    Electric Surf Board

    I ordered a 62x62mm. They said that it will shrink 2-3% after thermal treatment and finally I got a 60.5 x 60.5 impeller. It is ~95€.
  13. S

    Electric Surf Board

    Hello, i changed my carbon impeller to a 3D-printed steel impeller. It is really impressive quality and less vibration. today I will make first measurements of power consumption. Will provide results later.
  14. S

    Electric Surf Board

    Hello toto44, good video, looks like a lot of thrust for this small motor. Do you have a log of motor/esc power during this run ?
  15. S

    Electric Surf Board

    I already reduced voltage to 8S which did not make any difference. The MGM controller is tracking the "input current" and the "peak current". I thought that the Battery to ESC current is the "input current" ?? This one is very stable so if I am right, there is currently no need of capacitors or...
  16. S

    Electric Surf Board

    Hello Fabian, I am not using additional caps. The cables from ESC to batteries are not longer than 30cm. Cables from ESC to Motor approx. 80cm. Can the peak current at the motor occur because of too long battery cable ? I understood that the current between battery and ESC is the "input...
  17. S

    Electric Surf Board

    Here my graph after adjusting shaft and reducing system voltage from 60V to 30V. The peaks are still very high. I am also wondering about the input request. Seems that my remote control is only sending 0 or 100%. Will check this before next try.
  18. S

    Electric Surf Board

    Hello Frizzo, I am currently using the Turnigy Heavy Duty 4S 5Ah Lipos. They are rated with 60C (120C burst). At least for testing they do a good job. Have them in 2S2P now.
  19. S

    Electric Surf Board

    Yes I ordered directly from Lehner, in april this year.
  20. S

    Electric Surf Board

    Hello Mgivens, my motor looked already like this when i got it. I also wondered, because i expected black-purple. Dont know but i dont need color on it.
  21. S

    Electric Surf Board

    The Impeller should be too small (60mm) for the Lehner Torqstar 7050 275kV. I found that there was high tension on the shaft. Will adjust it again and do another try.
  22. S

    Electric Surf Board

    Hello Fabian, do you know why this peaks can occur ? You see on following graph, that the average input current is 10 - 20 A. Peak current is at motor side, maybe I have too fast acceleration ? I will reduce it and try again.
  23. S

    Electric Surf Board

    Hello guys, here some updates of my project: Today I made first water tests in a small pool (after fixing all sealing issues last days). It worked very well, also the water cooling, which I made according to Frizzo's suggestion. Here two log files of my controller. The peak current looks...
  24. S

    Electric Surf Board

    How about salt water, sand and dirt ? Anyone who had problems with direct cooling from nozzle water ?
  25. S

    Electric Surf Board

    Hello, my board is finally running (atm only dry for testing). Now I am thinking about cooling. I have the watercooled Torqstar 3 and the watercooled MGM 40063. How do you get cool water into your Motor and ESC ? Do you use external water or maybe a closed internal water circle with pump ?
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