Owen's Board Build - Dual Drive - SK3 6353

Unfortunately too many! It didn’t last too long. People bought like 5 of them just in case :rofl: Of course I was too late…

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Thanks for the wheels info. For the deck check privateshop. Last year they run 2 skate related campaigns where you could buy sick landyachtz decks, Paris trucks at 50-60% off. Better to keep eyes open for the next one :wink: Flipsky 4.12 is now st 50 Euro shipped. Still a crazy price for a vesc.

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Ah, will do! Thanks

I think I will invest in a Flipsky VESC and just use my single drive 6364 at 12S instead of dual drive… This shit is getting EXPENSIVE for me (a college student)

Well Flipsky 4.12 is more a 10s vesc if you ask me. I know @visnu777 used at 12 foc with no issue but still not a vesc6. Yoy already have big motors. Better you just buy two Flipsky 4.12 VESC 100 euro and you upgrade the battery to a 10s. It will give you more torque and braking then a single drive. Dual is generally better.

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I guess 10S makes more sense actually.

Trouble is I have a 6S pack as it is so will have to sell it and buy either 2X5S packs OR I might get 5x2S packs because they will be smaller and mean my enclosure can be smaller but I guess their discharge rates are smaller so possibly not as ideal? But they would provide me with more mAh because I would get possibly 5X2200mAh packs giving me 11,000 mAh rather then a likely 10,000 from two packs. Charging would then be a bitch and idk if it’s worth it, thinking about it.

Well you can actually buy a 4s pack. As long you connect them un series will make a 10s. I get your point for the thickness. For that 5x 2s is the best. For a 12s then 4x3s or 3x4s. For the Ah depends the use. If like 15-20km of range are fine then a 6000mAh should be enough

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Ah, I didn’t think you could do that because one pack would discharge faster than the other but I guess not in series! And thanks! never knew what sort of range i’d get from 10k mAh!

For the range and performance use an Esk8 calculator. It gives you good prediction. For the battery yes you can add it in series. As long the two pack has the same capacity they will discharge at the same speed

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Only now I saw you bought two 260Kv motors. Thst is too high for a 4.12 VESC. You will pass the ERPM limit. Yuu could limit it in the vesc setting but you will loose a lot of performance. What you can do is change the wiring configuration. A 260Kv motor is probably wye and if you move to delta it will be 260/1.7= 150Kv. With 110mm wheels and the roght motor and wheel Pulley, would be plenty of fun and crazy torque. Here a quick calculation

15475838120835832634072265533590

Here you see a pic showing that https://www.electric-skateboard.builders/t/review-and-eu-usa-group-buy-90mm-mad-hub-motors-75kv-or-130kv-dual-170-euro-1st-round-closed-working-on-the-dd-conversion-kit-mad-fury/62002/269?u=rey8801 You find tutorial on Youtube but basically you only need to open your motor and see the 3 motor phase wires. If they go together in couple of 2 then they are delta and you only have to separate them. Solder one of each together and the 3 left are your new phase wires. Done, 150Kv motors…:wink:

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I’ve been using that calculator and it’s so helpful!

So you’re saying that I need a lower KV to keep the ERPM down then. Can you also re-wind adding more turns to increase the magnetic flux through the field coils and then more torque?

or could I just use 8S instead, lower the ERPM to 53782? I don’t know the limit but thought it was somewhere around 60,000.

Looking at that link, I realised that that’s what i’ve been doing in my Engineering class and in my A LEVEL EXAM TODAY!

So, changing the wiring from a Delta formation to a Y formation, I should get more torque? Cheers for all your help!

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For 4.12 vesc erpm limit is 60K, for vesc6 based 100K usually. Anyhow for the actual fun you do not want to high Kv motor for 10s, 12s, because you end up with ultrasonic speed that you won’t reach and lower torque. You want to find a balance. Now with the motors you have there are two ways: 1- Check the wiring if it is delta then you can decrease of factor 1.75 to wye and get lower Kv (Kv = rpm x Volt), meaning more torque, less speed. Then you balance the torque with the speed by playing with wheels and gear ratio as I mentioned in the previous post. 2- In case the motor are already wye configuration or you want a custom Kv. You will need to unfold all the copper wiring and redo it. There are calculator online that helps to find the number of turns, wire thickness ecc… Way more work compare to the first one that takes 1/20 of the time and effort. :wink:

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Amazing! Thanks for your help, Ill see how this goes then look into it :slight_smile:

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You are welcome, and good luck with your exams!

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I made a new deck with more clearance. IMG_20190131_152455 IMG_20190204_145911 IMG_20190205_095215 IMG_20190207_105915 IMG_20190209_174504 IMG_20190209_181220 IMG_20190210_104956 IMG_20190210_111510 IMG_20190210_113332

Looking Good

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Until this

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IMG_20190210_114350 IMG_20190210_114821 IMG_20190210_114356

Fucked It

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Damn! That hurts. What wood did you use?

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3 sheets of 4mm marine Ply and 1 sheet of straight grain 3mm ply. (not sure of the exact wood)

Do you think the problem was the weak lamination or the wood itself? Because I am making a new deck and I have to choose which wood to use. The one you used I can find them easily

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I originally just used the 3 layers of 4mm and it was too flimsy and it cracked slightly on the bottom so i glued the third piece on and when I tested it, it broke along that line. I think it would have been fine otherwise. (I also jumped on it a bit hard)

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