Ok ... here's my idea (more of a combination of ideas already in production). Forgive me if I'm a little loose with the terminology. Obviously, I'm leaving out specific controller, battery, and motor selection/specs.
1. Optibike style frame, motor location and internal batteries.
2. Driveshaft (no chain) from pedals goes to right, rear hub.
3. Second driveshaft going from motor to right, rear hub.
(Two driveshafts possibly encased in single "chain stay." Two driveshafts may not be necessary. I wish I could get a conceptual grip on how the Optibike outputs pedal and motor power into a single chain. Anybody have some better pictures?)
4. Freewheel in between driveshaft inputs on hub.
5. Output of the 2 driveshafts goes into a NuVinci gearbox, then to wheel.
6. NuVinci gearbox is controlled by computer and servos mappable by user. Basic efficiency, mid, and all-out modes can be selected by user.
7. Front fairing.
I haven't tried to draw anything, but here's the basic concepts from pictures at
, and http://www.zzipper.com
I haven't quite figured out how the driveshaft from the motor to the hub works with a rear suspension (not an engineer here). The sussex bike design of the driveshaft going from the pedal to the hub looks like it works well, but the introduction of a motor in an optibike style location would complicate things.
So, basically, the goal would be to have an Optibike style bike with a drive shaft instead of chain drive, computer mapped/controlled NuVinci gearing, and a decent front fairing. (and all the volts, amps, amphours, discharge rates, etc. that could be run while maintaining a fairly stealth look).