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  1. K

    How do I fit a 15" hub motor into a 16" wheel?

    Title says it all. I bought a 700c close-out bike kit for a friend that changed her mind and gave it to me. I would like to install this hub motor into a kick bike with 16" wheels. I'm worried that having only 1" to spoke may angle the nipples too much for durability. I've looked around on...
  2. K

    Pack building business advice - What do I need?

    I would like to set up a business in Canada building and selling battery packs to Canada, US and Europe. I know that most kind souls will try to dissuade me from doing so, with the best of intentions. That said, I'm hoping to find a way to comply with regulations, and minimize liability to the...
  3. K

    Bulk Charge - there must be a better way

    Please help me improve my charging system. I just finished charging my first set of 50 A123 cells, 18650 size. These are all from old Dewalt power tools. There has to be a faster way to do this. The charge took almost a whole day! ! Equipment: - 20a lab power supply, selectable for CC...
  4. K

    Need help finding a DC Brushed motor controller

    I have a 90v DC motor, 10a max and from some testing the controller is shot. Low voltage supply works fine, high voltage supply is toast. So, it looks like I'm in the market for a new controller. I have a box from the old one, so a bare board would work. Can anyone recommend a good place and...
  5. K

    Katou's Math

    RC Motors - How to Choose Kv Here's the thing, if I choose a kv that is super low, I need a high voltage to get max power out. But what if we plan on keeping the voltage down? Then a kv should be chosen that gets full RPM out of the motor by the time full battery voltage is applied. Right...
  6. K

    Using Riv-Nuts

    How to Install and Use Rivnuts FAQ I guess that these are called Rivnuts / Riv-nuts / Riv nuts / Blind Nuts / Nut-sert or in generic terms, a blind-hole rivet containing an internally threaded hole for use on thin materials. On your bike, the water bottle holder attaches to riv-nuts. Look...
  7. K

    Belt drive Sprockets on the Cheap!

    This thread is so I'm not tempted to clutter up Recumpence's thread about his awesome new belt drive for the KMX trike. Here's my background: I made a series of small 3" dia epoxy pulleys to use a timing belt I got from a surplus store. The teeth stripped off. I believe that this was due to...
  8. K

    How to Test a Brushed Motor?

    Hey, I need a hand. I just found a brushed motor that I may be able to use. It's got a controller, but it doesn't work as a system right now. So, I'm trying to figure out which bit is the problem. I'd like to test just the motor, and then the controller. I have a 12v power supply, and a...
  9. K

    Nord Lock cheap!

    I had a feeling that my local fastener place (Brafasco in Toronto, ON) might have them, and lo and behold, they do. They quoted me a price (quantity 1) for a single Nordlock pair of $2 Canadian. I was ready to buy from someone on the forum here at $7 for 2 pair, and now I find that I can have...
  10. K

    Big Kick Stand

    Title says it all, need some help. I have a 25" Trek commuter that is getting a hub motor as soon as the battery is finished. I would like to have it be capable of standing upright even in a fair breeze, or stand a little bump. I haven't seen any that would do the job, especially for...
  11. K

    Dyno testing for Ebikes

    Interesting conversation with a performance motorcycle shop here in T.O. Their dyno (and I'm assuming others as well) can test down to 2 hp!! It has an assist system to get the rollers going to help on the bottom end, then the test happens. Cost for a dyno run is $65. They claim a precision...
  12. K

    Why do people do burnouts?

    Seriously, what's the deal with doing burnouts? It's like people think that the Ultimate Test of their machine is it's ability to lose traction with the ground. Doesn't this just show that the wheel isn't sticky/wide enough? It reminds me of this commercial where there's a Honda Civic and a...
  13. K

    Question for People who know about Dynos

    There has been a whole lot of guessing, conjecture and theory about which internal hubs have what strengths, but precious little data. I was wondering, to objectively test these hubs, couldn't we just use a dyno? I don't really know what a dyno can or can't do, so help me out here. Couldn't...
  14. K

    Battery Build - Trek wood triangle

    I am starting to build my first battery for a hub motor 9c in a Trek 700c commuter. Here is the start of the pattern: Here is transferring the pattern to a piece of flat material (easier to take notes on, and more true. The wooden pieces sometimes flex) Now we put the flat pattern in the...
  15. K

    A123 Internal Resistance Question

    What should I be getting as a measurement of IR for a good A123 cell? I'm also interested in standard IR for other cells, like Moli, Konion, or lipo if anyone has that info around. I'm starting to measure IR for my cells as part of the testing, but I'm not sure what I SHOULD be getting since...
  16. K

    What happened to my battery tester?

    I'm happily moving along, testing cells at 2c for a friend's pack, and whammo, suddenly, I hit a string of like 20 cells that all test out abysmally. I check for resting voltage before I start testing, which removes all of the dead cells. Additionally, any cell with a resting voltage under 3.0...
  17. K

    Convince me again...

    I'm about to purchase a Meanwell unit to modify to charge my A123 pack, aiming for a voltage around 48v (either 13 or 14s). Then a friend said why not just buy a commercial charger for lifepo4? I had the answer before, but now I'm sort of confused... Katou
  18. K

    Battery Testing, trying to save time

    I'm testing a boatload of cells, some A123, some Moli cells from toolpacks on my CBAIII Here's my question. What C rate should I be testing at? I am currently testing at 1c so each cell takes one hour to test. But, Moli cells are good to 2-5c depending on who you ask. If I tested at 5c...
  19. K

    Universal or Constant Velocity Joint for Steering

    Anyone heard about using one of these on a bike for steering? From the beginning, I've wanted to build a recumbent bike, then add an electric motor. I have most of the design worked out, but the steering is causing me some problems. The design is very much like ones currently available, but...
  20. K

    Super low Ohm meter

    I've looked on ebay, but I think I'm using the wrong search terms. I'm wanting an ohm meter that will measure the resistance of wires and contacts. Eg. I use 10 awg wire and I splice it to two 12 awg wires. I would like to know if my connection is as low in resistance as the wires. Someone...
  21. K

    Konions or A123?

    A123 has higher C rate, Konions apparently don't require balancing. Which one is preferred? Konions also seem to be sold cheaper?? Katou
  22. K

    Quick Voltphreaks Question

    1. What does the red/green solid/flashing light mean? 2. How badly did I damage the unit when I hooked a cell up in reverse polarity? A tiny wisp of the magic smoke came out, but not a lot. Katou
  23. K

    How to Experimentally Determine C Rate?

    As many of you know, I am trying to build a pack from used Moli cells from toolpacks. I am now testing cells to find the good/bad/ugly. According to manufacturer's spec, these things are good up to 10c, but I highly doubt that my used cells will ever be capable of that. In addition, others...
  24. K

    50kmh indoors!

    This guy is a member here, check out his video http://fayazkadir.com/blog/projects/electric-e-bike/photos-and-videos/ Too much!! Katou
  25. K

    Wiki FAQ?

    Why does this forum not have a wiki style FAQ section? There are problems with storing information in threads, things get lost, threads may have high signal:noise ratio, hard to correct things, etc. So, what do you think? Wiki style would give people the chance to add on or correct...
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