Simon, building a side car as we speak and will power the side car with a hub motor.
Electric is mandatory here in British Columbia. The option is a $5,00 fine and 2 years in jail max.
Bike is a 50's Monark and I'm planning to hinge the side car so it will lean with a rod from the seat post to the side car frame that will stop movement at about 35 degress.
I am losing the use of my legs slowly and my balance isn't a lot better and I hoping that having something to stop me from going past that angle will help.
Think a 20 inch powered wheel will work and help lower the center of gravity for the side car. The side car is almost complete and then it's on to the frame.
Your thoughts are most welcome.
Steve.
FE, I'd be very interested in seeing what you are building and the bike it is intended to attach to.
Going with a 20 inch wheel on the sidecar very slightly changes the geometry of articulating the sidecar to allow leaning, but it isn't really a problem. Since the nominal axle height on the sidecar side is 10 inches, and the axle height on the bike is (I assume) nominally 13 inches, turns at full lean into the sidecar attachment side will tend to cause your drive wheel to hop unless you have a significant mass of battery weight below the axle height, depressing the CoG. Putting the majority of that mass at the end of that lever arm will also help a great deal.
Post some pics, please, if you got them. I have often thought that for e-bikes to be practical, they really need to be trikes (to enable carrying sufficient battery mass to give a decent range. Doing that through a sidecar actually makes good sense.
I know a gent in eastern Washington who is a recumbent fan, and is an electrical engineer for the BPA as his career. He built a tadpole trike with a battery pan below the main boom, giving him 4 inches of ground clearance, and a 240 mile range. We have been discussing building a delta full suspension trike, with independent swing arm rear suspension and enough battery capacity to go 180+ miles on a full charge, at an average speed of 25 mph. I am doing preliminary sketches - once he gets back to me with his load and distribution numbers I'll do a full on design study and generate plans/specifications.
So, yeah, I'd like to see your project.
Patrick