Let me start off by saying I'm not 100% certain that this is the correct forum for this to be posted in, if I'm incorrect in doing so, I apologize. I've found several threads previously discussed about mousetrap cars, none of which answer the questions I have. I have four days to design and produce a working mousetrap car that's premesis is to travel the furthest distance. I'm in High School, so it it is a pretty basic assignment, but they will be raced, and I like to research & understand situations the best that I can. So without further adieu: These are some of the thoughts & questions I have any input/help would be greaaaaatly appreciated. A) Will using a smaller diameter wheel in the front be advantageous to the efficiency of the vehicle? Or will it hinder by losing surface area traveled? (Note: The drive axle per usual, the rear...) B) We were debating on using a PVC insert within the frame so that we could better lube the axle and reduce friction between the axle & frame. Thoughts? (Also considered using a type of plastic clip that would allow the axle to be mounted under the vehicle's frame...) C) Most importantly steering, the width of the wheelbase provides stability, and the length (correct me if I'm wrong) will provide a greater distance traveled...I'm sure there is an optimal point in which these theories achieve a the best possible results. Any ideas whereabouts it is? The maximum length of the cars is 50CM/ No max width. We will most likely be using a 13 CM arm, but again if for some reason this would be too large, please shoot me some details! Thanks in advance.