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  1. V

    E-bay power supply

    Has anyone tried one of the 500w supplies on e-bay advertised as having current limiting built in for battery charging? Seems like it should work without a limiting board... I'm thinking something like this one...
  2. V

    EV Power vs Speed

    I guess I should have considered the section I am posting in more carefully- but to clarify by e-bike I did not mean to exclude scooter type (I own a couple of them), recumbent (not yet but it looks fun), or traditional bicycle style (also in my collection and 2 tidalforce frames on the way)...
  3. V

    EV Power vs Speed

    I'm contemplating building a touring e-bike, something that I can travel significant distance with as work seems to be taking me all over the province. One question that keeps rolling around in my mind is what is a realistic power consumption figure to use for an e-bike travelling at 70-90kph...
  4. V

    LiPo battery care and basic information

    The C rating you need is just your peak amps divided by the Ah capacity of your pack (in you first one 50/14=3.58). If you're carrying 10Ah+ for range with the controlers you indicated the C rate is more an indicator of quality of cell rather than a constraint in performance.
  5. V

    fastelectricbike - DIY Stealth Bomber

    Here in Canada I took my roll of tape to the paint shop and had them mix paint match to it before I painted my race car... its nice to have your spot repairs blend in at the end of the week-end.
  6. V

    Zippy Flightmax / Turnigy lipo testing

    really boring day at work, so I tossed every poly pack Hobbyking sells into a spreadsheed and made the assumption that you would use any bonus points on the item in an order. A quick sort shows only 2 packs under $0.45/watt; the one I previously posted and this one which is currently out of...
  7. V

    Zippy Flightmax / Turnigy lipo testing

    If you aren't an UBER member and can settle with only 15C you're way cheaper building a pack with these: http://www.hobbyking.com/hobbycity/store/uh_viewItem.asp?idProduct=6502&aff=150208 works out to $0.41/watt plus shipping.
  8. V

    Hydraulic brake splitter - I lever two calipers

    I'll disagree on this one, its actually real easy to do a quality Job on a brake line on your own. Just order up whatever hose size you want and whatever Earl's fittings you need. On our formula car we try to avoid any crimp fittings- when the hose gets damaged or you decide to make a change...
  9. V

    1983 Puma EV - I got questions..

    Running something like 120v 500amp peak will make a reasonable runabout. At freeway speeds (100kph) expect about 150-200 amps for an average small car. Zilla would likely kill that motor unless you de-tune it, but it would give headroom. Curtis or Kelly make usable bits, I'd look for a second...
  10. V

    Dropout Failure Experiments, and a call for Fork Donations

    UGH... LFP types faseter than me.... Dito what he said about lubrication and measuring stretch plus: Where were the nuts sourced? Based on my own (automotive) tinkering I've learned that a 12mm nut and bolt is definately not a standard... the manufacturing tolerence for an ISO standard quality...
  11. V

    Switch mode supply mod

    With the concerns about instability with the fan cycling wouldn't the quick and dirty be to just force the fan to run 100% of the time? Would still give predictable output and it can't hurt life cycle to keep things a little cooler. Suggestions on the best way to accomplish this?
  12. V

    Tessla Engineering Blog

    Tesla's curve looks reasonable for something running a torque converter... if you throw an automatic on a chassis dyno you'll get a torque curve that looks like that down low.
  13. V

    24 Mosfet Controller XJC8b116 microchip Information Thread

    If you build it they will come.... I'd be happy to sample the high volt version.
  14. V

    Switch mode supply mod

    I am looking for something in the 98-99 volt neighbourhood so on the voltage side I should be fine with 2 in series. I just want to get the current under control so they don't heat so bad while charging. My units are exactly the same board as I linked to (stamped: s-350&201 2005-09-19), with...
  15. V

    Switch mode supply mod

    Maybe I missed it, but what was the final verdict for this failure? Bad bits or related to Hyena's mods? I have several of the s-350-48's identical to the one here: http://img44.imageshack.us/img44/6478/mws35048.jpg with the exception that mine hs C36 populated with a 63x3300uF cap. Per Mike's...
  16. V

    Naming Convention for NC and other Hub Motors

    I really like using the Kv value in the name. Its also pretty easy to add a tag at the end to note different versions with the same Kv ie- NC-9-HT for a higher torque with kv ~9 or NC-9-LT for a lightweight version also having a Kv~9. When it comes right down to it I really don't care one bit...
  17. V

    On the Saturation Current of Hub Motors & Simulator Accuracy

    I don't know if I knew something or just made a lucky guess, but how i figured it was based on the winding resistance I counted on the 9C producing ~2.2x the heat but only having 175% of the surface area. Based on my fuzzy math I give the 5304 about 3 minutes longer than the 9C... Remind me...
  18. V

    Which would you rather buy? LiFePO4 48V15Ah, or 72V10Ah

    you're getting 720 watts of battery either way, so unless there is a bms or charger or something just buy the cheaper one.
  19. V

    Dropout Failure Experiments, and a call for Fork Donations

    I would be interested in seeing how much less force it takes to spin an axel the second second time (ie new fork but same axel)...
  20. V

    On the Saturation Current of Hub Motors & Simulator Accuracy

    Assuming you use a 7 turn hub I'm betting it'll be ~34amps and it'll take 36 minutes to cook the same as the EZ. *EDIT* unless you use only 1 power supply- then I bet you run out of voltage and have to drop the current giving the 9C the win!
  21. V

    Zippy Flightmax / Turnigy lipo testing

    If the hobby king 4x6s channel chargers are isolated, is there any reason a guy couldn't leave it connnected perminantly on a 24s pack? I'm thinking have it hard wired in, use a external power supply to bulk charge the pack when I need it quick and use the 4x6 to do a balance or top off charge...
  22. V

    Help to Increase Speed-500 Watt Electric Scooter/Moped.

    stock gio is good on 60v, also good with 1/2 the shunt bypassed (but will start to get warm if pushed repeatedly). Just be sure to run the chassis electrical at 48v and only boost the controler else you will cook the lighting/dash. PM me if you need specifics. -Noel-
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