Recent content by lepton

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...

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...

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...

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...

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

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.

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...

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

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...

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...

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

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.

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...

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.

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...