I am looking to make a 4WD, single-engine powered vehicle, and I have seen others such as this which use three differentials to distribute the power to all 4 wheels:
I am not quite understanding the need for the center differential - what would happen if you simply had one gear drive two followers, i.e. one for the front and one for the back? traditionally a differential is used when one side would spin more/faster than the other, such as when a vehicle is turning, but I am not imagining a situation where the front end will travel more than the back end, so why was it designed like this?
P.S. - yes, there is all sorts of discussion in that thread already about the center differential, and the tldr version is that it's dead-simple to replace if you want to, and many people have their own opinions, but not so much "why" or where the forces go/what it would look like if you do remove it