Diy Electric Surfboard Running on 12s/44v

Hi the diy electric surfboard running on 12s/44v is definitely a power upgrade from the 6s lipo test, so we will see how well it does on the amp's. The brushless motor's are rated at 150amp's so lest's see if it can handle the power upgrade.I am looking to build a powered e surfing board that can stand up to some of the best electric motor jet boards out there. Being a homemade electric surfboard there are alot of factor's to consider so In these tutorial's i go through pretty much each process in crafting a double waterjet powered jet surfboard so that it can help other's also interested in building there own personal watercraft.
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Thanks The Waysider.
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[@micahkoelmeyer1519]

12S is what I have running on my system and its great power. Glad it's working for you too. Ride it!

[@thewaysider7774]

Cheers it feels good just some kinks to work out

[@matthewbrookes6749]

Great work mate. Cant wait to see you ride it.

[@thewaysider7774]

Thanks man me too

[@evandrofabianobarbosa6884]

Your work is amazing bro

[@thewaysider7774]

Cheers man

[@liebie999]

Good advice from @Koolzr01. Great to see the project moving along. You really need to get in the water with it to see how it feels. As long as the cooling is working it should be OK. Strongly recommend capacitor bank, will save your ESCs.

[@thewaysider7774]

Hey cheers how many capacitor's do you think would be good?

[@mexail86]

1. Привет. Классная доска получается, дизайн и подход супер. Смотреть на нее очень приятно.
Но по технике я присоединюсь к остальным комментариям.
2. Снижать напряжение ниже 12s не имеет смысла, прийдется задирать ток, чтобы получить достаточную мощность в 10+ кВт . А при увеличении тока в два раза нагрев увеличится в 4.
Увеличение напряжения только увеличивает шансы попасть под удар тока, это единственный минус высокого напряжения))
И да, если у вас на этом импеллерре на 24 в ток был 100А, то на 48в ток будет под 300, если батареи смогут его отдать.
Я бы сразу брал другие моторы с меньшим kv, вместо 550 хотяб 230kv. И желательно с большим диаметром и outraner. Это уменьшит частоту вращения крыльчатки и уменьшит ток. Ну а дальше бы уже экспериментировал с размером и шагом крыльчатки и проч.
3. Нужно стремится к уменьшению потребления тока. Потому что этих батарей вам хватит на пару минут. А это очень мало.
4. Если не хотите менять двигатель, то берите крыльчатки у YOUNGSTERS JETS. Я не понимаю как он на этих двигателях и своих крыльчатках едет 60км/ч)) наверное у него сильно лёгкая доска и он сам.

[@thewaysider7774]

Hi thanks for the ideas. For now I will do whatever is best after more testing, maybe higher amp motors but lower kv I have alot more I can try with my jetdrives.as when I printed them I didn't really know what size I should make youngster is on a 60mm impeller so I will try some stuff out cheers.

[@Koolzr01]

Hey brother love the update! I have some answers for your questions to help get this going along.
1) keep it at 12s to 16s. Dont go down in voltage from where youre at now.
2) Your amps are higher because your motor is now spinning significantly faster for the same throttle % input with higher voltage. Still need to reduce that impeller pitch so at max throttle its pulling 150 amps.
3) motors cut off because of voltage sag on the batteries. Your esc has a cut off limit set at some level. Under high load the battery voltage sagged under that limit and tripped the cut off. You can change this somewhere when you plug it in to the computer or have more batteries in parallel to provide the current needed.
4) if your motor cooling is good, dont worry about the 150 amp rating (within reason). Amps themselves wont hurt it, the heat generated over the magnet and copper insulation limit will.
If theres anything else you can think of i would be happy to answer if i can. Its such a fun project but can quickly become overwhelmingly frustrating trying to figure it out yourself.

[@thewaysider7774]

Hi I hear you on the prop pitch it's just the file I modified was from thingyverse and couldn't change everything I wanted. What if I came down In size from a 64mm to a 60mm for example ? Or smaller if needed. And also I have a 45 mm jet nozzle opening would making that bigger help? Thanks for all the advise will look into the voltage cut thing also.

[@Koolzr01]

@@thewaysider7774 you can't reduce the diameter of the impeller, gaps between the edge of the impeller and jet wall will crater the efficiency and thrust.
A quick workaround for you might be to take that file and put it back in your slicer then scale only the Z dimension smaller. Will basically be trial and error for how much but should work.
I wouldn't recommend enlarging the exit nozzle until you work on the impeller. You will significantly reduce the exit velocity of the jet.

[@thewaysider7774]

@@Koolzr01 yeah cheers i also made a wear ring as i downsized the impeller once already, i made a video on it. I can make the ring smaller also to fit the new impeller but i will design a new impeller eventually now i've made it easier to come off the shaft. From my research the nozzel opening has a similer effect to pitch of prop but there is a balance to be had of course. My idea is to make the jetdrives new out of p.e.t. cf plastic once i know the correct size ecetera. then i can share the files. Thanks again for your help am taking on board all the advise.

[@SpencerGaming7580]

Maybe you should just go with 56123 motors and 16s, that should push a light guy like you with reserves

[@thewaysider7774]

Yeah eventually will look into changing motors if i have too but you know its another bunch of money.

[@SpencerGaming7580]

Can't do compromises such as Close to the Goal