Thought i'd make a seperate thread to discuss something that came up in the Xray thread about rubber tire characteristics as they apply to RC cars.
All the full size car literature and teachings talk about lateral forces generated at or beyond the limits of the tire, where the more you load a tire the lower its effciency gets and the end result is less overall grip. The primary goal being to REDUCE roll and REDUCE loading on outside tires to increase overall lateral grip in corners. Think NASCAR wedge & preload techniques for ovals making a car faster by reducing the outside tire load.
Now for RC cars it seems this is not (or may not be for most cases) true as the tire is operating well below this region and is operating where more vertical load equals more overall grip.
So the goals for RC racing is to have INCREASED roll (assuming camber is kept in control), and INCREASED tire loading to get more grip.
Anyway, i'm interested in the technical aspects and whether in fact this is true for RC tires. Most of us can dial a car for front/rear balance correcting for oversteer/understeer off and on power using shocks, springs, rollbars etc. but how many of us have a real handle on increasing overall grip (and hence cornerspeed) of the car?
Some part of me refuses to believe that a heavier RC car is faster thru corners than a lighter one... if i'm wrong i'd like to know why!!
it would be cool to build a tire testing rig, but i'm not sure if it would take a month or the rest of my life to complete!