Friedlbug's e-bike build thread

[friedlbug]

OK, I've decided on the design of the e-bike I want, and I will be building it. The motor is in route to my home and I obtained a free 10-speed today. Progress!
Free Murray "Explorer" 24" 10-speed (24" is the right size for me):

The frame fresh from the Goo-Gone treatment (fingernails, Goo-Gone, elbow grease, and an old sock):

The Bosch 24V 350W DC permanent magnet motor on the way (old but unused - $20 with shipping on ebay):

Here are links to the design:
http://autospeed.com/cms/A_2419/article.html
http://autospeed.com/cms/A_2421/article.html
http://autospeed.com/cms/A_2430/article.html

[SVOboy]

Looks good so far, excited to see your progress!

[tasdrouille]

I'm watching as this is something I want to do when the 15 feet of snow start melting here.

[Ryland]

why did you choose a 350 watt motor? Bosch seems to make good motors, so I suspect it will have more real life power then most 350 watt motors, but I still wonder what your top speed will be.
also, any idea on how you are going to connect it to the drive wheel? speed controller?

[MetroMPG]

This looks very interesting. Looking forward to watching the progress.

[friedlbug]

Originally Posted by Ryland

why did you choose a 350 watt motor? Bosch seems to make good motors, so I suspect it will have more real life power then most 350 watt motors, but I still wonder what your top speed will be.
also, any idea on how you are going to connect it to the drive wheel? speed controller?

I got the 350 because it seems that's about the most that can be gotten from 24V using practical amounts of current. I want to stay with 24V because I like the plan in the Autospeed links at the bottom of my first post (manual, switched speed control with regenerative braking). It will be a friction drive.

No pics yet, but I just finished spraying the frame flat black and stripping the old dryrotted tires and tubes off the rims.

Excuse the lack of experience and proper terminology, but anybody know if new innertubes come with the rubber strip that stretches into the rim and covers the spoke connectors?

[friedlbug]

Schematic of switched electrical system from the article referenced above:

[Lazarus]

As far as the rim tape you'll have to get that separate from the tubes. Velox is good. Good luck with the project I look foward to following it.

[friedlbug]

Painted and cleaned up (plus the seat is no longer in the "violator" position):

[friedlbug]

I got the motor today and took my first ride on the bike (without electric yet, of course). I have to say that I'm a little annoyed with the motor seller, since the motor came labelled as a 12V motor. There's no reason why I will not be able to use it as a 24V motor for 350W, but it still should have been listed as a 12V or 12V/24V motor. Anyway, the bike after ashort ride:

The motor: