From the very beginning, we've decided to use two non-driven wheels in front, one driven wheel at the back. Cause two driven wheels would mean two motors and two controllers. Plus three wheels compose a rather stable structure. When I did this very first sketch, I was thinking more of the aerodynamic shape of a race car or a bullet. So the driver would be kind of lying on his back as he drives the car. This idea was then abandoned during our first discussion cause we feel that the driver would risk a quite high chance of being thrown out when turning, and since the driver is lying down, he cannot really see what's going on in the front, but mostly the sky.
We're going with chain drive instead of gear drive so there won't be a part sticking out from one side of the rear wheel thus leaving no space to put the driver's feet. Chain drive is also easier to build, so.... We're probably using the 8 inch wheel provided to us as the rear wheel. As for the design of the steering wheel, we compared the methods of the previous go-karts and finds the chibikart has the best maneuverability, so we are going with that for now. For the curvature part, we are still not sure how to do that. Jiawei pointed out that maybe we could just buy one of those plastic horses for children to ride on, then secure it to the aluminum frame. But will it be kind of heavy? And not very customized for our design. We're also not sure how well plastic and aluminum come together so.... Or maybe stuffed animals? a long pillow? a sofa cushion foam? Or the wood laser-cutting patterns used by the other group before?
The top view and side view are attached below:
*All of the three drawings are in scale. 1'':0.5cm
Note: We haven't decided on the wheel size yet. In the above picture, the rear wheel looks much bigger compared to the two front wheels...which may not be true as we proceed to next week. And we've decided to move the wheel out from the chassis a bit cause it doesn't look very safe intuitively. We'll look into that later. Btw, we are planning to put all the batteries, controllers etc. on the chassis right in front of the rear wheel.