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  1. lepton

    Cold Weather Exercise

    I have that problem too, sometimes. In my experience the best ways to deal with it seem to be: 1) exercise outside regularly throughout the year so the body has a chance to adapt to changing seasons 2) wear a scarf or balaclava that covers your mouth so that you're breathing in warmer air - this...
  2. lepton

    Bike recommendations? Alu vs Steel

    I used an aluminum Specialized FSR XC (full suspension) for about a year with an x5 motor. I made a torque arm out of 3/8" thick 6061 aluminum that went from the motor axle to the disc brake mount. I figured since I wasn't using the disc brake in the rear, I might as well use the mount since it...
  3. lepton

    Need a low-comsumption tractor. Don't want speed

    Echoing Dogman, it sounds to me like a rear 5 series Crystalyte motor would be an appropriate pick. The large diameter and coil count will be advantageous for high torque from a stop. A 5305 (higher turn count the better) would be good. Out of everything listed thus far a 5305 will have the best...
  4. lepton

    Planetary + Clutch Dual Speed

    The NuVinici is certainly neat, and that dev kit is quite cool, but a lot of the user reports have been mixed or even negative for its use on e-bike applications. The efficiency of it when it's far from it's native ratio gets to be pretty bad, and slipping seems to be a problem. There are some...
  5. lepton

    Repository for 3D Part Models, Drawings & Schematics

    BMC 750 watt non Hub-Motor (based on personal measurements with a ruler, so the exact dimensions shouldn't be trusted)
  6. lepton

    Repository for 3D Part Models, Drawings & Schematics

    I'm a fan of posting as many file types as possible. Step files (.stp) are pretty good - their Solidworks and Alibre support both seem to consistently work well.
  7. lepton

    The push for 70 mph.

    This may be the video you're talking about: http://www.youtube.com/watch?v=Swq9hBdvkKU Scary stuff. I've spent a lot of time around 40 MPH on a full suspension mountain bike frame. At those speeds I wear a full face helmet and motorcycle jacket, but it's still a dangerous thing to do. These...
  8. lepton

    NovaTorque motors

    Interesting. Any word on price or availability? I see neither on their site.
  9. lepton

    Ecological footprint of a small EV vs equivalent fuel car?

    Attached are two documents that I came up with in undergrad. One of them (An Analysis of Battery Chemistries) talks about the lifecycle energy efficiency of different chemistries, given the published data I could find. I had hoped to find more data on LiFePO4 based chemistries, but the marjority...
  10. lepton

    Left side drive brake options?

    This idea is exactly what I'm thinking of doing for a new frame build that I'm working on. Let's start finding caliper spec sheets and such to see what sort of clearances are available. One potential issue is heat into the chain. There could be more warping, heat cycling fatigue, or the heat...
  11. lepton

    winter riding

    This thread has some decent commentary on the subject: http://www.endless-sphere.com/forums/viewtopic.php?f=1&t=6128
  12. lepton

    Bike Lust

    I used to have a Dahon folding bike with 20" wheels. The cargo rack was at about the same height as that longtail. The low cargo height was fantastic for carrying heavy groceries, etc.
  13. lepton

    System (U, Motor, Controller) Efficiency

    On my way home today (yay for leaving early on Friday) I cruised at 25 MPH so that I could usefully pedal the whole way and reduce wind resistance. The stats for today (on the exact same route as my above post) were: 1 ) Efficiency - 23.17 Wh/Mile 2 ) Speed - 25 MPH cruising on long straights 3...
  14. lepton

    Alternator to Motor Conversion

    Interesting. I didn't expect that, and I wonder what the boundary between polar regions look like magnetically. Either way, here are some pictures for reference.
  15. lepton

    System (U, Motor, Controller) Efficiency

    Daily commute average: 1 ) Efficiency - 29 Wh/Mile 2 ) Speed - 35 MPH cruising on long straights 3 ) Gradient - Almost completely flat 4 ) Pedaling - hard for acceleration, none at cruising speed 5 ) Bike - Full suspension mountain bike 6 ) Motor - Xlyte 5304 7 ) Controller - Xlyte 4840 analog...
  16. lepton

    Schwinn Tailwind from Dorel for 2009

    Dynamo lighting? That seems somewhat backwards to me. Energy goes from electrical in the battery to mechanical in kinetic energy, back to electrical through the dynamo and then to the light? Seems like using that battery pack to power the light would be a much more appropriate use of whats...
  17. lepton

    Etek Project: Bike to Trike

    Nice power supply! I got the same one off ebay a few months ago. It's great. Electric tadpole trikes are a nice platform to work with, I think you'll be very pleased :)
  18. lepton

    Alternator to Motor Conversion

    The rotors on the BMC non-hub motors are completely smooth, with the magnets inside. I'm not sure what material is used to get that surface finish, but its almost like the magnets are completely covered in an epoxy, making the entire face a continuous cylindrical wall. Something like that might...
  19. lepton

    How much do you pedal on your e-bike?

    I use clipless pedals, too, on all my bikes. On my daily commute on my X5 system I pedal hard during acceleration and at speeds below 30 mph. Above that I don't have sufficient gearing to keep up with the motor, so I fake pedal a bit sometimes, or just ride without pedaling in a tucked aero...
  20. lepton

    Aluminum vs Steel frame

    I'm using a rear mounted X5 on an aluminum Specialized FSR XC (aluminum swing arm and drop outs) with a torque arm fabricated from 1/4" steel and bolted to the brake caliper mount on the swing arm. Running at 72 volts for about six months now. No problems yet.
  21. lepton

    high power/high speed BLDC controller build

    Nice work! Major kudos. Is the motor as loud in person as it seems in the video?
  22. lepton

    high power/high speed BLDC controller build

    After opening the motor up, do you know if its wound as a Delta or Wye configuration?
  23. lepton

    How Fast is your Ebike versus How Fast do you want it?

    On my daily commute I go about 40 mph (64 kph) on a long, straight rural road. I have a personal rule of not going faster than 25 mph in bike lanes / paths, since that's about what I'd do on my regular old road bike. At that speed I wear a full face helmet and a motorcycle jacket. Crashing...
  24. lepton

    I've hit a RACOON at 55kph !

    I've had more close calls with Prairie Dogs than I could possibly count. They tend to live around bike paths, and they wait until you're just about to pass them to run out in front of you, crossing the path to get to their holes on the other side. Very stressful, I'd hate to have an experience...
  25. lepton

    Looking for big crank.

    There are some useful links in this thread: http://www.endless-sphere.com/forums/viewtopic.php?f=11&t=1173 :)
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