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  1. T

    10S custom skate ESC: testers wanted!

    For GPLv3 then I have no idea. Googling looks like they can use it as long as they "make the source available" (this could mean you have request source access) if they distribute it. They probably won't be distributing the tool, just the firmware (already on the hardware) so they may only have...
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    10S custom skate ESC: testers wanted!

    I may be wrong, but the project is open sourced and can be used freely, even for commercial use (per CC BY-SA 4.0 license). The license states they need to give attribution to vedder... but I don't know if they are required to do so if they aren't releasing design information. If they take the...
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    You guys heard of Benchwheel?

    Found some other alternatives: - http://www.aliexpress.com/item/Lithium-Batter-remote-control-1800W-Double-electric-longboard-ZBoard/32338903277.html -...
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    6.4 kW MBS eMountainboard build

    A larger gear ratio should help too.
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    My build thread - Front wheel, 180mm, Nunchuck, Glasfibre

    They make directional bearings, I can't remember the "real" name of them though. On my very first build 10 years ago I used them inside my small sprocket. I had the sprocket milled to fit perfectly then had the machine shop press in the bearing. it would spin one way on a shaft, but not the...
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    KV vs Gearing?

    There are a number of things getting mixed up here (though I'm not sure if it effects anything). Efficiency is are not the same as torque. Max efficiency does not equal max torque. So just because you are more efficient, doesn't mean that you have more torque, so I'm not sure the drag racing...
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    KV vs Gearing?

    From a mechanical engineering standpoint, I think the only thing that would make one less efficient would be gear/belt friction. According to Vedder's article, the 14 pole motor that is at 8600 RPM would be the "most" efficient. At 50kv motor at 10s would turn at 1900rpm, a 100kv motor at...
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    KV vs Gearing?

    I'd say just design your gearing and KV based on your requirements. See this: http://vedder.se/2014/10/chosing-the-right-bldc-motor-and-battery-setup-for-an-electric-skateboard/ For example, more efficient KV based on battery: 12s: 3.8*12 = 45.6v 8600 / 45.6 = 189 KV or 10s: 3.8*10 = 38v...
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    Kranx powerstik (drill powered)

    Ha, thats funny. Its still only 17 horse. You could probably get close to that w/ 4wd electric.
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    Kranx powerstik (drill powered)

    What you have there is a flexible drive shaft. Why use a drill? Make the thing 6-12" shorter and it allows you to mount your motor on the side/bottom/top of your board. You don't have to worry about mounting your motor to the trucks b/c its made to move. Seems like a great product with a...
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    E-mountain board research notes and build - Advice please

    I'm definitely re-considering this. I didn't realize the lifespan of lipo's was so short. 100 cycles seems is high. So if I ride to work 5 days a week for 5 months out of the year and charge everytime I ride... My batteries are gone in a year (or really... 5 months). If I mess around and...
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    E-mountain board research notes and build - Advice please

    Good call on the PC power supply... I think I even have some laying around. I did some quick googling and I think I'll eventually go w/ a server power supply. They have better stability and shut off protection and used ones are like 10 bucks (used PC ones would suck... ). Yeah, I'll probably...
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    MBS Pro 12 e-mtb build

    Great post. I'm looking to build something very similar. I like your "scrub hub" (thats what you called it) idea for mounting the sprocket. I was going to drill the sprocket, but thats way easier.. Is that really just fiberglass? Is it strong enough? Also, hows it do going up hills... can...
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    E-mountain board research notes and build - Advice please

    I think it should work. As long as the IMAX B6 can handle 12V input, I have one of these power supplies I used on my kitchen led strips so I'll test it out maybe. Sorry, I just meant I would do 2x 6S's... not 4x 3S's. I'm going 12S total for sure.
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    E-mountain board research notes and build - Advice please

    torqueboards! Thanks for your quick reply and thanks for all your info on the site! Based on what you've said... I think I'll probably do the 6s's. I'll probably stick w/ a higher gear ratio to start with, most likely a 1:8 (10T and 80T). If that ratio is too high, I can really easily swap...
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    E-mountain board research notes and build - Advice please

    Hey All, I'm building an electric mountain board and I thought I would post my research before buying anything. Background I bought a used mountainboard about 10 years ago ($25 at a garage sale http://www.sierratradingpost.com/mountainboard-sports-ambush-warrior-mountainboard-~p~99877/) which...
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