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Originally Posted by ChrisH
Or it might make things better. It depends on the surfaces involved. If the playing field has a clean metal surface, metal wheels might actually be a good bet. Metal on metal actually results in a very high coefficient of friction and a small contact area enhances this. That was a key principle in the CVT that 190 did a few years back. We also used in on our slide drive in 2004.
However, if we are back to the standard carpet then the line contact would probably be better. Because of the carpet, not the wheel.
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within a clean gearbox, metal/metal friction may be high but on a field. its hard to keep it clean. THAT clean. and even a small scratch may affect it.well for the highest gear its easy to have a "Conventional flat faced tire.... its just the low gear... which i guess is also possible but it can also generate a torque not just longitudally but laterally? or... well. a sideways torque... which may actually work too. kinda like toe-in (on the rear axle of a car would be a good example). aggressive tread would work for that. basically clawing into the carpet. kind of.