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  1. S

    Rewinding and reconfiguring hoverboard motor

    Thank you for answers. Yes i know they are not ideal. But they are dirt chip. I will use them only as battery charger. 6 poles 27 slots are balenced, but need some slots interleaved. Will have to test it still.
  2. S

    Rewinding and reconfiguring hoverboard motor

    Hello ! I am looking for starter/generator for my stirling engine in a 1000 rpm / 400-500 watt range. Since hoverboard motors are easy to obtain and have best power/buck ratio especially in used form - i tried to use them. But - if on starting and 500rpm range all is nice and fine, efficiency...
  3. S

    Sevcon Gen 4 Errors and Solutions thread

    Done this already, only to extranl site with expired password. Tried to register here for myself..
  4. S

    Sevcon Gen 4 Errors and Solutions thread

    Hi ! could someone send me a link to for dvt software ?
  5. S

    greenworks old type 40v battery.

    Ok. So it is ok to use 4 packs to deliver 2000watts in longer burst ?
  6. S

    greenworks old type 40v battery.

    Thanks guy for reply. No, i am from europe. I had solve this problem in simply manner - use regulated switched mode converter from ebay. 1.2-36 volts and 8ampers. 12 amps protection. Vorks perfectly. I' am littly dissapointed on china cells. Are they any good on long run ? 7 amps are per cell...
  7. S

    greenworks old type 40v battery.

    Cheaply for 25 gbp each bought four greenworks old type, non gmax batteries. Looks like new. Holds charge well. Will use it for e surf board. Did any one have any ratin on max djscharge current ? Yes, i do found how to activate them. Also - did any one now how to use this old type battery on...
  8. S

    Electric Hydrofoil/E-Foil

    There is not such a thing as really, strong. All should be calculated. I think this : https://i.imgur.com/nuUIxn0.png Or that one: https://i.imgur.com/oGleLAS.png But, yes, you cant do it with idle sprocket pulley on working side. And it is not so wide - ~22 mm...
  9. S

    Electric Hydrofoil/E-Foil

    If any one is thinking of angled gearbox, got some info from supplier - 10 gbp for set of bevel gears, 12/22 teeth and M1.5 module + you will need main 62020 bearing and 6001 on small end for main shaft, and two 627 on vertical shaft. + aluminium foundry and some machining. It will be happy...
  10. S

    Electric Hydrofoil/E-Foil

    You still need kind of prop saver to avoid any problems with debris /prop inbalance. Twin tapered bearing are bullet proof but bigger.
  11. S

    Electric Hydrofoil/E-Foil

    It is always possible to add aditional bearing for axial load. You will be making a new axle for seal, so make it with thrust bearing, and it will last. Additional 5-7 cm. They are rated with some safety factor. But not more thatn 2-3. Plus god lubraction and proper oil. Anyway. Found info on...
  12. S

    Electric Hydrofoil/E-Foil

    Sorry to be on sarcastic size. But 40 sised gearbox is good till 16-20 kg of thrust https://www.neugart.com/de-de/produkte/planetengetriebe-mit-abtriebswelle/ple/#PLE40 Any decent 2hp/1.5kw outboard gives you about 50 kg of thrust.. More on zero speed. Or 55lbs per hp.
  13. S

    Electric Hydrofoil/E-Foil

    http://flyingfishhydrofoil.com/ good idea on propeller drive
  14. S

    Electric Hydrofoil/E-Foil

    First link is super. From my research v shaped foil is not the only option. And its limits wave sizes. Easies is bipLane configuration. Lift on two wings, cruise at one. I think we need someone to test how big motor or gearbox we could use for minimum penalties in performance. Or go to fishtail...
  15. S

    Electric Hydrofoil/E-Foil

    I had same ide few pages back. Just lok into 2-3 hp outbard leg and you will got almost all that you need as size guide. Not smaller.. As motor i have posted photo of 2.2 kw generator. Its working rpm is close to 3600. And its holds this power all time. Mast is main problem. It should be done...
  16. S

    Electric Hydrofoil/E-Foil

    No. On same motor you may have same torque/ power on same rpm. With different voltage and amps ratio. If you go higher in power input - core will saturate and you will lost power. You cant introduce more flux into iron core. It has certain max value. Energy in flux change is constant. Changes...
  17. S

    Electric Hydrofoil/E-Foil

    Found another good source of brushless motor. This is a motor from electric power steering pump. Core is 7 * 7 cm or a little more. This drives hydraulic pump directly. Few kilowats easily i could guess. Will try to figure out oroginal amperage of it. It from gm family. Thanks for plywwod...
  18. S

    Electric Hydrofoil/E-Foil

    This is human psychology - we want it better and for free :)
  19. S

    Electric Hydrofoil/E-Foil

    I was loking into this https://crazyfoil.com/product/crazy-foil-2017-ex-002/ plain, rectangular foil with speed data important for us. Also - have seen an plywood kit somethere..
  20. S

    Electric Hydrofoil/E-Foil

    Did any one have good drawing for slow/stable/easy foil ? I do have access to big cnc router, could cut them from plywood and laminate. Found some calculations for hydrofoil boats, but not for boards..
  21. S

    Electric Hydrofoil/E-Foil

    "Robust by design", calculated to work 24/7 for few years with some / regularly maintenance. For gearbox - it is calculated not to transfer static load, but for dynamic/inertial load - like going on full rpm, and stucking prop - all rotor inertia try to broke an gearbox. And few times in a row...
  22. S

    Electric Hydrofoil/E-Foil

    But it will happen. I do totally agree on industrial heavy-duty planetary gearbox with industrial brushless - just don't know where to find them for decent price.
  23. S

    Electric Hydrofoil/E-Foil

    Any drawing is better than 1000 words. In the attachment are two motors - one c6364 230kv which is maxed at 2850 watts, and pancake generator from inverter generator ig2000 which is rated at 2000 watts continuous. Cooling - just mount stator to aluminum plate. Burst i think is at least 4000...
  24. S

    Electric Hydrofoil/E-Foil

    +100 same experience. You are not flying on it. But it make you hurt if broke at bad moment.
  25. S

    Electric Hydrofoil/E-Foil

    Yes and no . It is ok to use leg from 2hp outboatd motor. And as must you still need a prifile, not a sheet. Battery 600 eu for unit buildfrom tesla batteries. For 2 kwh.
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