Search results

Date Relevance Most replies

  1. D

    Project: Pangea (smushing two 9C together to make one motor)

    Yup I think dualies are the way to go; worth it for the flat tire redundancy alone. You know, if I offset the axles on the central strut, I could get the wheels closer, and have a narrower and simpler strut with two holes. I haven't decided yet whether the central strut will be holding the...
  2. D

    Project: Pangea (smushing two 9C together to make one motor)

    I like this. It also allows me to use the wheels and tires already fitted to the hubs. Could also make something that looks like airplane landing gear with the load bearing shaft between the wheels. With the strut ending in a bearing with a big hole, the outside and inside joining of the wheels...
  3. D

    Project: Pangea (smushing two 9C together to make one motor)

    Back in 2010-2011 I picked up a bunch of 6x10 9C hub motors when an ebike site was doing a 5 motors for $400 close out sale. I wanted to use them to make a 4 wheel electric bicycle car. However a three wheel vehicle would be much easier to fit into the vehicle classification laws in my state...
  4. D

    **Important** reality check on motor, voltage, current etc.

    You're mixing up independent variables with dependent variables. You're taking power to be an independent variable and making current dependent on it, and saying that if power is constant then reducing duty cycle means current must go up to maintain the same power. Well, yes, but only if you...
  5. D

    E-bikekit.com sale, My Chance to Build 4 Wheel Bicycle Car

    Off road might be the way to go. It'd get around some of the difficulties of making a four wheel home-made vehicle street legal, for one thing, and if I didn't care about top speed I could just use two 48V 20AH batteries (I have one already). I should rebuild the hubs into 20-inch wheels to...
  6. D

    Hub axle not fitting dropouts

    I had to file the dropouts on my bike too, see pictures here if you like (scroll to the fifth picture): http://dennisferron.blogspot.com/2009/09/electric-bicycle-conversion.html However, I also had those filed out dropouts fail on me recently, the axle spun and spread out the dropout tangs...
  7. D

    E-bikekit.com sale, My Chance to Build 4 Wheel Bicycle Car

    Thanks for the info about the axles, Justin. If it's at all marginal I think I'll go with the safer option of supporting both sides of the wheels. The only problem with using forks on the front wheels is I think the stem rising up so high would spoil the look. But wait - why do the forks have...
  8. D

    E-bikekit.com sale, My Chance to Build 4 Wheel Bicycle Car

    Not sure if this belongs under e-bikes or general EV discussion, but I'm posting here because at this point I'm still only talking about bicycle hub motors/wheels. As I'm sure most here at the forum know, e-bikekit.com is having a clearance sale on 6x10 motor wheels, $80 each if you buy five...
  9. D

    Long story, asking how do I make this bicycle SAFE to ride?

    Yes! That's exactly what I'm thinking of too. The problem with my battery is that it's wide, as in width between your legs, not width front to back. So I'm thinking if I had a bike like that I could have it under the seat/under my legs. You mean like this right (from your photobucket)...
  10. D

    Long story, asking how do I make this bicycle SAFE to ride?

    Thanks for all your responses! It's a mountain bike frame that I put road bike drop bars and wheels on because I liked them at the time. (Naturally I changed the wheels again when I made the electric conversion.)...
  11. D

    Long story, asking how do I make this bicycle SAFE to ride?

    After being disappointed by the slow acceleration, low top speed of a wilderness energy / aotema 24V brushed hub with SLA, I decided to go all out and put e-bikekit (Nine Continent?) motors in both the front and back wheels, along with a 48V 20AH ping battery. I'm not really going for max...
  12. D

    Boston Consulting Groups Forecast for Battery tech to 2020

    An interesting analysis but you have to wonder how credible the Boston Consulting Group really is. I recently read this editorial: http://tech.mit.edu/V130/N18/dubai.html by someone who worked for BCG in Dubai. Basically, what his job was, was that the client already had conclusions they...
  13. D

    Better Ways to Control E-Bike Speed than just a Throttle

    Since I'm building my own motor controller, I'm thinking of using something other than just a "throttle" to control its speed. This is based on my experiences with riding a (fairly weak) Wilderness Energy 24V brushed motor: there were actually only a few "use cases" for what I wanted to do...
  14. D

    Bicycle Alarm Active Countermeasures

    Yeah, I think you're both right - it's a bad idea. Nevermind I won't be doing this. I think I'll stick with something that just tracks the bicycle's GPS coordinates. Most GPS trackers that use cell towers I think require a monthly subscription. Maybe I can make one that doesn't require a...
  15. D

    FH205 hub motor

    Hi waverunner! I bought the same motor, and I'm actually building my own controller for it too. We should share ideas. I'll post my schematic as soon as I have it finalized. I'm going to use Sparkfun's BatchPCB service to have a board professionally fabricated, and once I've uploaded the...
  16. D

    Bicycle Alarm Active Countermeasures

    There's a thread where extremegreenmachine talks about carrying a taser while he has a bicycle alarm, in case he needs to confront a bicycle thief. What about going one step further - I want to build the taser into the e-bike itself, so that the bicycle alarm delivers an electric shock...
Back
Top