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  1. O

    Estimating Load/No Load RPM Difference for Gearing

    Most of us are calculating with 80%
  2. O

    Custom Build... 2 Speed H.O.B.O Powered e-Cruiser

    I wonder, if the people feeling a kick in the a** when they shift in second, do shift to late? IMHO they'd better shift at 50% of max RPM or a little later. That's where the torque curve begins to decrease. Correct me, if I'm wrong. :lol: -Olaf
  3. O

    Turnigy CA120-70 8600W Brushless Outrunner (100c eq)

    How about using an epoxidisk mounted on the shaft with 14 tiny magnets in it? The statorfield wouldn't disturb there IMHO, or at least the field would be in the wrong direction.
  4. O

    TONARO Pedelec Kits

    Hmmph, tried to order the 240W version, but they don't deliver to germany. I don't dare to call them, it was dificult enough to stumble through their french_only menus. :roll: Anyone located in france, who wants to order for me and send it to germany? -Olaf <edit> Compared the data with the...
  5. O

    TONARO Pedelec Kits

    I'm interested to buy one of those kits. But the link to eastsunworld is dead... Where else can I get one? THX Olaf
  6. O

    Nice 5:1 gearbox

    Not yet, I started my own business and moved back to germany. I hope to go on with the build pretty soon. -Olaf
  7. O

    New Bosch drive system

    Since I started my own business in may, I asked bosch for a chance to get my hands on the edrive. I'd like to use it for tadpoles and recumbents. BTW it delivers up to 625W and since it's an 3 phase motor it can be tuned for sure with a different controller/battery. I'd also like to build a...
  8. O

    Headway 40160S LiFePo4 Questions.

    I think he is talking about the HK- LiFePO packs. They aren't worth the money. -Olaf
  9. O

    Hobbykings new 5000mAh hardcase LiPos

    *UP* They're available in the US warehouse now. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=18631 -Olaf
  10. O

    High C-rate LiFePO4 Polymer Battery

    It seems, no one is interested in an european group buy. Then I'll make my own order and report test results gathered with my new cruiser. -Olaf
  11. O

    Water-Cooled, 63mm, 8kW

    Why not making a hollow shaft? I thought of drilling holes from both ends, but leave it solid in the middle. Then drill radial holes right next to the solid part, so the water fills the area between shaft and stator. ...or even better: Why do we need a single piece shaft at all? Usually we...
  12. O

    BLDC phase timing

    AFAIK the better RC controllers do have an automatic timing algorhythm, but the bike controllers don't. -Olaf
  13. O

    Adding hall sensors to outrunners

    The motor seems to run with wrong timing. But at least, it seems you've found the right firing order. :) Label the hall signal cables in the connector like 1-2-3; then put cable 1 in position 2; 2 in position 3; 3 in position 1. ( position in the connector ) If that doesn't work; put 1 in...
  14. O

    High C-rate LiFePO4 Polymer Battery

    I'm working for http://www.ececars.nl/modellen. We have built EVs with Kokam for more than 3 years. I know what I'm talking about. Maybe you have to build up a reputation first to get good prices?! -Olaf
  15. O

    High C-rate LiFePO4 Polymer Battery

    @ EVDragracing I don't want to compare apples with oranges, but the cells you'll have in connecticut are of a complete different kind. Especially cycle life at 30C is a bit disappointing. Also 6Ah isn't very impressive. I like the 18.5Ah cell from FreeGo, because it would fit in a triangle...
  16. O

    Outrunner: stationary shaft?

    You could use brass bearing or needle rollers if you dont have enough room. -Olaf
  17. O

    Bypassing BMS for High Current Application

    Thats why solenoids like the tyco czonka 3 are much easier to use. A bit overkill, but pretty common: http://relays.tycoelectronics.com/datasheets/ev200.pdf -Olaf
  18. O

    High C-rate LiFePO4 Polymer Battery

    Usually I pay 2.4% import-fee + 19% tax. I'm in no rush, since the BMS and charger aren't in stock at the moment. Either I cancel those items and order now or wait two weeks untill I pay the order. I'm also thinking to order some headway 38105 cells ( 8.5Ah too) to compare against each other...
  19. O

    Bypassing BMS for High Current Application

    I had the same problem with electrifying a scooter with a ping-BMS. I used solenoids that where switched by the BMS power output but the power-lines were wired directly to the battery. -Olaf
  20. O

    MIT Scientists Create Goo-Powered Batteries to Replace Lithi

    Sounds like: http://endless-sphere.com/forums/viewtopic.php?f=14&t=28824
  21. O

    High C-rate LiFePO4 Polymer Battery

    I received an offer today. Shipping is cheaper to germany. Probably additional shipping from germany to croatia is cheaper too? -Olaf
  22. O

    Doc GOT 100 samples of Titanate LTO cells update 6june 2011

    I was wondering, how you want to connect them? Spotwelding or soldering is a bit tricky with aluminium poles. Imagine the horror of building a big pack like in the tesla roadster and then have to exchange some bad ones over the years. :x Did you try to get some Li-Titanate cells from EIG too...
  23. O

    HE Cabling: Micro B USB Connectors

    Am I missing something? Why does the connector has to fit in ( or through ) the nut? You have to solder the hall wires inside the motor anyways. The only drawback I can think of, is: the nut can't get lost when the connector won't fit. :lol: Or do you replace the nut regularly? -Olaf
  24. O

    High C-rate LiFePO4 Polymer Battery

    I just asked for a quotation about 16pcs. of both celltypes. Since I'm located in germany, do you like to share shipping cost with me? Or do you like to wait until I tested them? -Olaf
  25. O

    12 kw rc motor

    Nieles is right. Why else would a wye motor have the same efficiency but deliver lower rpm? Same battery current leads to longer duty cycle for the FETs in wye, thats why switching losses and overcurrent stress is lower in wye. The inductivity is higher in wye, thats why the current slope is...
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