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  1. B

    Watt hour for lippo and lithium-ion

    Hello I have a question about the wh between a lippo and a lithium-ion. If i have a 30ah lippo pack and a 30ah lithium-ion pack wil i theoretically can drive the same distance? I ask this because a full lippo is 4.2 volt and a empty is 3.0 volt but with a lithium-ion battery full is 4.2 and...
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    Hacker motor

    Can somebody explain this datasheet try to figure out how much torque this motor can give? Nennspannung / nominal Volatge 50 Volt Leerlaufstrom / No load current 3,6 A spez. Drehzahl / Spped constant 36 min-1 Leerlaufdrehzahl / No load speed 1800 min-1 Ri incl. Steller / Resistance incl ESC...
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    Max erpm and field wakening

    Hope this is the right section, its about max erpm and field wakening. If my controller can do 60000 max erpm my motor has 21polepairs and i am using 20s (72 volt nominal 84 max) and a kv of 34tr/volt. So i become at max voltage 59976 erpm within the range of my controller, but when i use field...
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    surron bicycle with qs205 middrive

    Hello, dont know if i am posting this in the right section, buts its complicated. I was looking for a middrive and i liked alot the style of the surron, but this is a moped and not a bicycle, here in Belgium when driving into the woods a bicyle is more accepted then a moped. So i decide to...
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    sabvoton 72200 short circuit

    Hello , i have a problem with my new 72200 sabvoton. Its short circuit afther 5 seconds of working. Did hall test what was fine, then i tried run position the wheel spin for 5 seconds and it was over :( What could be the reason or did somebody had the same problem ? Opened the controller for...
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    QS 3000w midmotor

    Anybody tried this motor already? Just make an order for one, gonna try it with a sabvoton 72200 :D
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    DA-90 motor

    What do You guys think abou this motor? http://www.eastgem.net/da-90.html
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    Which controller?

    We all love the direct torque-feeling that electric motors can provide, but mostly will the controller not give that direct power and will there always be a sort of delay. Maybe will it be good to know which controllers give that direct power (amps) . So if You know such a controller let me know. :)
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    cheap -high power motor combination

    Somebody ever tried this:https://nl.aliexpress.com/item/BM1424HQF-2200w-DC-72v-brushless-motor-without-differential-gear-BLDC-motor-without-gearbox/32295888018.html?spm=a2g0z.10010108.1000016.1.31722b046cJYmm&isOrigTitle=true with a kelly KBS72221E for short burst of 260 amps? Its like the bht...
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    motors linked together

    Is it possible to link two identical motors parallel and let them work on one controller? One motor sensored and one sensorless, will it become one( bigger) motor?
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    4-5-6 transmission

    I am looking for a transmission for my 20kw electric motor in the style of the brammo engage. https://www.youtube.com/watch?v=9g2TsoLTg3o
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    Derbi senda with hacker motor

    Hello everybody I want to share my latest project. Its not finisched yet but i have already 9 hours of drive-fun:) :D Its made out a derbi senda with alu-frame adjusted to adapt the new motor and batterybox. The motor is the hacker Q150 -45 with 71 rpm/volt, a 14s lippo battery with 5kwh...
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    DELLER russian dirtbike

    Anybody ever heard about the russian dirtbike DELLER? Just found this video at youtube https://www.youtube.com/watch?v=hVFfdVBYr9M Its all in russian...........can't understand a word :roll: it seems very powerful :D
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    higher or lower kv

    I wondered what is best for middrive motor higher kv and bigger reduction or lower kv and less reduction? I have in mind a fast acceleration :D
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    the brand of this bike

    Does anybody knows what brand this bike has? I downloaded this picture a while ago but can't remember where its from?
  16. B

    plettenberg Nova 15 and adaptto

    Never seen before but is there already somewhere a wedding between a plettenberg nova 15 and a adaptto E-max ? Just playing with the idee :D
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    large downhillfork

    I want to buy a large 300mm downhillfork are they still for sale, and does anybody knows where to get it ?
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    customised frame for revolt 160 short

    Here my newest project, customised my mountaincycle with a batterybox (normaly for 6 multistars 6s 20000mah if they ever come back in stock) :evil: The frame is waithing for the revolt 160 short , dont know yet if it will run on 50 or 70 volts ordered also controller by revolt will try it out...
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    Xnova 8kw rc middrive first test

    Made a video of the first test with the bike hanging up. :D http://youtu.be/3Y8ux1xONZQ
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    riding video with Revolt motor

    Somebody have seen a riding video with a revolt Pro 120 motor as middrive?
  21. B

    belt reduction 5M15 or 5M25

    Hello i try to figure out how much power i can run true a 5M15 belt, and from what powerlevel( watts) i have to move to a 5M 25 belt for the first reduction ? thx C.
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