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  1. fourbanger

    Stator/magnet swept area

    Trying to figure out the relation between the amount of surface area passing a magnet and the amount of power a motor can reasonably be expected to produce. These figures are derived by calculating the stator diameter * 3.14 * stator width. Here are some examples [numbers are in centimetres...
  2. fourbanger

    Motor recommendations for mid-mount

    Thought I'd try something different here and ask for a bit of advice... HA! Basically I'd like to keep both the battery and motor, maybe controller (as much stuff as I can, really) INSIDE the triangle. To accommodate this (and because I like the way they look) I'll be using an old school...
  3. fourbanger

    Run a 3 phase generator as motor.

    Can it be done? Thinking about it I see absolutely no reason why not, but then again my ignorance in the field of electric motors is profound--get it? Field? I'm looking at this and wondering if it might be just the thing to mount in the frame of a bicycle to drive the left side of the rear...
  4. fourbanger

    What if motor watt ratings..

    Burb, excuse me. What if manufacturer's advertised motor wattage was representative of how much heat it could shed rather than produce? Would that make sense? Do the lower wattage motors actually overheat more easily? Less copper? That would account for the slightly lower price between a 1000w...
  5. fourbanger

    THE MODERN BICYCLE AND ITS ACCESSORIES

    Bit of light reading if you're into that sort of thing. https://www.gutenberg.org/files/58444/58444-h/58444-h.htm
  6. fourbanger

    Pack build: Sewer Pipe Dynamite Roll

    Well, for my first pack build I thought I'd make things as difficult as possible for myself so I decided to go with a cylindrical pack using a 4" PVC pipe as a container. Wow. Ok, here goes... After scratching the terminals with some medium grit, applying the insulation ring around the...
  7. fourbanger

    Mystery Bafang Motor.

    Looks like a BPM but I've never seen one that doesn't have the cable coming out the axle.. Any thoughts?
  8. fourbanger

    Problem with Grin's Slim Throttle (wiring)

    Hi guys. I just recently this lovely piece of hardware to replace my existing (and rather clunky) half twist. It looks good, feels good, but I just can't get the thing to work. At all. I plug it into the same 3 prong JST port as my existing throttle was, but nothing. I am honestly at a...
  9. fourbanger

    Meanwell HLG-320H-54A + ignorant battery design questions.

    Hi guys. First off, I just received the afore mentioned meanwell led driver from digikey for $130 Canadian pesos (super fast delivery time, btw; highly recommend) but the thing seems to max out at 58.7VDC. My question is will the 0.1V deficit give me problems balancing a 14S system using a...
  10. fourbanger

    Battery charger mod.

    Hi guys, I've got a 48v charger--High Power HP8204L4--that I'd like to tame down to bulk charge a 12s lipo pack. I've found the trim pot in the charger but I can't get the output voltage down past 52.4 so that's no good. Any thoughts on an easy/cheap fix for this? Thanks.
  11. fourbanger

    A question of range.

    Alright, this is probably pretty rudimentary stuff to a lot of you but for some reason (stupid) I can't seem to quite get my head around this concept. If I had, say, a pack of 10s6p (let's say each cell is 3.7v @ 3000mA for the sake of argument) then that gives me a 37V 18Ah pack or...
  12. fourbanger

    Noob controller question

    Controller is rated at 25A Max current. 12A Rated current. I take that to mean that while the unit can push 25A it can't sustain it for too long and is happier at a mere 12A. What I don't understand is why i couldn't break 32km/h ~ 20mph with a 48v system while the bike was running on the...
  13. fourbanger

    BMS Battery High C-Rate pack.

    https://bmsbattery.com/ebike-battery/609-high-c-rate-48v15ah-li-ion-alloy-07-case-battery-pack-battery.html Is this a good buy? At that price it seems a little too good to be true? Anyone out there have any experience with battery packs from these guys? Thanks in advance for your replies!
  14. fourbanger

    Raleigh 3 speed cruiser. First build. Advice requested.

    https://s3-us-west-2.amazonaws.com/usedphotosna/41870160_614.jpg Just bought this old timey bike a couple days ago. It's actually a little tall for me but with an old license plate from one of the local municipalities I just couldn't resist. SA 3 spd with drum brake sealed the deal and the guy...
  15. fourbanger

    PORN! bike porn, that is.

    http://www.cyclesmithy.com/pages/bicycle-museum OH YEEAAAaaaah!
  16. fourbanger

    em3ev 25R frame pack finally in.

    Someone in Canada should probably order a few of these and sell them on EV so we can all save some cash on shipping. Just sayin.
  17. fourbanger

    40152 Headway battery from GBK

    Wouldn't mind some opinions on this battery pack from greenbikekit.com Thinking of pairing it with a BBS02 750, possibly even a DD in addition at some later date. I like fact that it's solderless as I can't quite decide yet where/how I'd like to mount the thing and would like to be able to...
  18. fourbanger

    Overvolting Bafang BPM

    Unit says something about 500w (26) or something-or-other about wheel size. I'd like to push it to about 750w on a 700c wheel. Rear. Think it will take the heat, or am I pushing my luck a bit? Thanks, as always. V.
  19. fourbanger

    BBS02 in French frame or Peugeot suicide.

    It's an old UO8 with cotter pin steel crank assembly. Knowing what little I do about french thread pitches from the 70's combined with my instinct tell me "don't do it," but the rest of me really wants to. Any experience out there? Thanks again, V. PS. Looks a lot like this bike but isn't...
  20. fourbanger

    Hello.

    Hi. Just logged into this forum for the first time. Me, I live in Victoria BC. Canada. I bought a retail ebike a few months ago and have bitten by the ebike bug, so to speak. Sadly this particular bike was stolen just recently. It was a rear geared hub 500w 48v kind of cruiser style 24spd; just...
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