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  1. underdog

    The lightest low kv RC-motor for 500w middrive

    I am trying to put together the lightest possbile middrive from scratch. Going lower diameter RC motors will in general terms meen bigger kv ratings. So I guess my challenge is to find the ultimate solution in terms of total weight (and sice) including reductions... Does anybody have experience...
  2. underdog

    Underdog`s Projects

    Happy to report that my long awaited new workshop is now opened. Some cool bikes are comming to life these days. Here is a couple of the works in progress...
  3. underdog

    Thread for new battery breakthrough PR releases

    http://pubs.rsc.org/en/content/articlepdf/2014/ra/c3ra47853j Old news? I Cant find any real good practical experiments, or results... Anyone? edit: "Carbon aerogels from bacterial nanocellulose as anodes for lithium ion batteries" Looking for "real world" test-results
  4. underdog

    AWD fatbike (first build, first draft..)

    Hello. Is that a MAC motor in the front? I am currently making a almost identical rear-wheel for a fatbike, what kine of spoke lenghts did you use in the front wheel? Regards Magnus
  5. underdog

    Underdog`s Projects

    I have neglected to update anything for a long time. Waited for something modified enough :) Just completed building this badboy for a good friend of mine. Its a Gary Fisher Cake 1 frame, with BB7 200mm disks, manitou swinger in the back and 130mm Splice in the front. Running 24" 9C-clone...
  6. underdog

    Noobie planning an Electric bike with >30 mph

    You want one of the 50V packs from here: http://em3ev.com/store/index.php?route=product/category&path=35 Paul will sort you out. Good priced top quality packs! Go for the 20R-cell-packs if you want stupid-power 8)
  7. underdog

    Noobie planning an Electric bike with >30 mph

    NO... That is a by my experience a bad idea, no mather how carefull you are. Go for a desent BMS system, and a bulk-charger. Problem with balance charging, is that you are running unprotected when driving. While doing this I have killed 10% of my cells over a 30-day period (I only run up to 60...
  8. underdog

    The Cycle Satiator, universal charger for the enthusiasts

    Hello. I just recieved the beta-product. It has been tested and found working beautifully on some custom packs we had laying around in the shop. We want to mount it to our service-bike that we use to get around to our customers when service-calls is needed. If I have understood the information...
  9. underdog

    need help Identifying unknown cell

    That is a genius idea. :) Do you have another good one for charge-rate?
  10. underdog

    need help Identifying unknown cell

    Hello. Does this information-tag tell anybody something? I know it is supposed to be a 10Ah pouch. But I can not seem to find any information on the nett from that information tag... What I really need to know is what kind of C-rating it has...
  11. underdog

    Noobie planning an Electric bike with >30 mph

    1 vote for quote of the day! :lol:
  12. underdog

    Discharged to deep (LiPo pack w/ bms)

    Misinterpret me right :) I am happy for all help I get. I am sorry for misleading with the picture. I do now understand that the reason my charger did not start is still a mystery... I am not paranoid, but I feel that if one should posess lipo`s, one should understand and account for every...
  13. underdog

    Discharged to deep (LiPo pack w/ bms)

    Ok, I understand that I should have mentioned that this is a picture where the sense-wires are disconnected. I thought people would understand that I do not run the BMS without these. Just did not have a good picture of it complete connencted.... :wink:
  14. underdog

    Noobie planning an Electric bike with >30 mph

    I can wait to see where this build is going to end up. I am really looking forward to it :) When do you expect to start the build btw? Do you have any time schedule or estimated time of completion? If you are ever in the Oslo area feel free to come by my workshop.
  15. underdog

    Discharged to deep (LiPo pack w/ bms)

    Oki. Little update. I am seeing some wierd behaviour from my BMS system I think. The pack is constructed of The Good-priced 4s 20C Hardcase LiPo`s from HK. Two and two put upon each other and 12awg leads soldered together into 8awg. It has a D131 80A BMS and closed off with supersticky tape...
  16. underdog

    Discharged to deep (LiPo pack w/ bms)

    Hello. I have a little challenge in my hands. I discharged my 2P20S LiPo pack to deep for my charger to start charging it. I removed parts of the enclousing tape to disconnect my BMS. I found that all the parallels are between 3,50 and 3,66v To a total of about 72,1 volts. I figured that this...
  17. underdog

    Cycle Analyst V3 preview and first beta release

    Thank you Justin. So I figured to, but Still nothing. But probably my bad somewhere... :)
  18. underdog

    El Supreme GNG

    Nice bike. Qudos! We shold da a e-meet here in Oslo some time 8)
  19. underdog

    Cycle Analyst V3 preview and first beta release

    Hello again. I am converting two CA-DP`s into DPS`s. The first one i did like the manual tells me to on page 57. For some reasson that did not work. No speed is reported on the CA. I have still not had time to find the problem, so probably just a glitch somewhere by me doing it... But for the...
  20. underdog

    Arduino automated Li-Po warmer for Winter-conditions

    Thank you mistercrash. The idea of using mulseveraltipel thermistors in different places is something I will look into. Got the arduino mini R5, and realized it is TINY, and that it did not have a usb-port. damit. Also need some relays and stuff, so the project is still in pending.
  21. underdog

    Noobie planning an Electric bike with >30 mph

    Baby steps approach would be to buy a complete 500w kit and lug it on a bike, and upgrading piece by piece from there. I would not feed a 9C that much volts in stock configuration. I have been running a stock 9c at 74 volts, and that is just about the limit before it starts arching inside. When...
  22. underdog

    Noobie planning an Electric bike with >30 mph

    I feel like weighing in here. I hope you dont mind... :D Having gone threw all the same considerations, ideas and thoughts you are doing here, I can imagine the confusion. Since cost is an important factor, and learning is one of the side goals, I say "build to wreck". In the last two years I...
  23. underdog

    Arduino automated Li-Po warmer for Winter-conditions

    Hello. E-Biking in Norway during winter season can be a challenge with ebike batteries. On my bike I am not going to have a easily removable pack this winter. So I am considering to build a semi-automated system using a arduino mini into the pack enclosure. Using a aluminum enclosure...
  24. underdog

    Underdog`s Projects

    I have not been to happy with the 74V lipo pack I built earlier in the respect of safety, and ease of mount and removal on my bike. So I have been trying to come up with an idea of how to make the pack more safe, and more servicable. Tape and shrinkwrap does not feel totaly flame-proof... This...
  25. underdog

    Underdog`s Projects

    Since I tried the 12T MAC motor on the "post-service" bike, I have been looking into the posibility of running a higher voltage setup of this motor on my own bike. But I can find a couple of concerns by doing so, and not much documented tests from others... I understand that hotrodding a geared...
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