Recent content by ulrichw

Markz's advice sounds good if you're building your own wheels, but I think you may have a more basic issue: Spokes work in tension, not compression, so a bent spoke to me implies that you may have lost tension. Have you checked your spoke tension? My cheap chinese front motor wheel came with...

http://www.rainbowtrainers.com/bicycle-science/

Nice bump! The article that triggered this thread shows the danger of extrapolation. Here's a more recent Economist article that may help explain why the prediction didn't come true...

Aloha, Francis! It sounds like you have a CA, so instead of using the very inaccurate measure of miles to determine how much energy you're pulling from the battery, don't you have direct access to the real measure - amp-hours? (some reasons for the inaccuracy of miles are illustrated by the...

I chose to wire only one sensor for my full-time PAS configuration. I have it on the rear brake, though I find that as I'm downshifting when approaching a stop, sometimes I'll trigger the pedal-assist (since I'm shifting with my right hand, too). Hasn't been a big issue, though. (Note that I...

I'd like to hear the experts weigh in on this: To me this doesn't follow at all. I would be inclined to think (without any direct knowledge of the matter) that controllers' components are more sensitive to voltage than motors' (i.e., most motors support a higher range of voltages than the...

Others are sure to give you better answers, but just wanted to point out that the 36V 15 Ah battery has 540 Watt-hours to the 48V 11 Ah battery's 528. So assuming the controller/motor are well-matched to the 36V battery, that's the one that should give you the longer range. I think you're...

http://www.gizmag.com/ford-autonomous-cars-dark/42742/ Maybe not the best source, but above article suggests that Ford uses LiDAR in the dark and the snow on test vehicles. This one suggests that rain is also accounted for...

I intend to post a separate thread on my build - it is indeed similar. (Q100/328rpm front wheel, 10Ah 36V bottle battery, LCD 3 display - my intention is to use it only in PAS mode). My shakeout ride went great - rode 30 miles (48km) in 1:19 - note that I was providing a significant amount of...

Hi A..dam I simply swapped the yellow and blue pins on the connector attached to the HWBS, so I believe I ended up with the red/blue connectors reversed from what you have. The connections are: HWBS Controller -------------------- Red Red Blue Yellow Yellow Black I'll...

Fwiw, I had exactly the same issue - HWBS light continue lit when connected to S06p controller. I swapped the blue and yellow pins on thee connector, and the led now correctly turns on and off, and interrupts the motor when the brake is activated. I believe the blue/black connector is related...

My personal opinion: You said you're using this in college, so I'm guessing you're young and therefore not completely out of shape. Also, typical riding around a college campus is short-distance low speed. How about you start with a non e-bike and get the e portion later? Bikes are very...

Try this "Gedankenexperiment": - Weigh your charger + battery combo - Weigh your battery - These two weights added together are the total weight you are carrying on your ride - Now create a new battery that is the same weight as this total. Which one will give you a longer total range? (All...

A couple of problems I see with self-driving cars: The first, which this incident illustrates well, IMO, is that while self-driving cars will probably quite easily surpass average drivers from a safety perspective (maybe they already have?), they will have accidents in different circumstances...

It's actually even worse than that. The power to overcome aerodynamic drag goes up as the *cube* of the speed. (The force is what goes up as the square). Therefore, doubling the speed increases the power needed to overcome drag by a factor of 8, not 4. (Note that there are other sources of...