spinningmagnets wrote:If you may actually make a custom frame, perhaps consider making the shock horizontal to the top-tube just under it. Then, square-up the bottom of the frame between the wheels, and that would make a great location for a squared battery pack between your ankles. It would place the battery weight fairly low.
If the squared-bottom frame caused too much flex in the main diamond (trapezoid?), perhaps add a left-side 45-degree flat-bar, leaving the right side open for a hinged access-cover to the battery. Just some thoughts...you have awesome drawing skills, thanks for posting!
I would love to have the funds to start from scratch and build a frame. I've been on the design team for 2 Formula SAE cars and nothing is more thrilling than modeling that entire car and seeing it come alive. Unfortunately E-bike are not what ill be focusing my life's engineering work on, custom vehicles have always been a hobby. If I ever do design a frame from scratch it will likely be one large extruded aluminum piece as a stressed member (swiss cheese and add appropriate placement points with a water jet). Of course it would have nice cnc'd billet blocks on each end with motor mount and steering tube ect. I would probably make a carbon fiber swing arm. I dunno.
I've often though about how I would design a production E-bike. Once I begin thinking about it I usually revert back to keeping this as a hobby. I'm thinking about going into the home geothermal heatpump system install business... Any thoughts?
I think I'm going to go with a single stage reduction now. Originally I was going 2 stage because I was contemplating going up to 24s I think the max ill actually do is 14s so single is fine.