I’ve been working on this model of the first purpose built, self propelled car patented in Germany by Karl Benz in 1886. The modelling work is pretty much finished and now I’m working on the textures and lighting. Built in Blender 2.69/2.7 and rendered in Cycles.
The front wheel is thin in all the photos on the web. In fact, I used the drawing on the original patent application from 1886 for the main dimensions. The link between the steering handle and the wheel may be too thin. I’ll have another look. When the steering handle is turned from side-to-side there is a rack and pinion at the bottom of the steering post which moves the link to turn the wheel.
The horizontal wheel is a flywheel that keeps the engine steady when it’s running. It also serves as the starter. There are several film clips on YouTube showing how a person gives the flywheel a vigorous turn to get the engine going.