I knocked up a concept CAD drawing in Google Sketchup to get a feel of the design. Having tweaked it, I'm satisfied that it will be good.
Points to note:
- The foot platform is below the centre of the wheels. This may help its stability, but more importantly it reduces the step up and travelling height.
- The wheels are supported from both sides. Whilst this may have an unsightly look to the frame, it means the design is cheaper as it can use standard bicycle parts.
- The overall width is 600mm, this was my target width to easily drive through doorways.
- When the motors are installed, there should be ground clearance between 75-100mm.