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Originally Posted by NoodleKnight
Actually CVT's are in a lot of cars today. The new Toyota Prius Hybrid uses a CVT transmission, so does the Mitsubishi Colt Plus, and Ford's Escape Hybrid uses a CVT. I don't exactally see how constant grinding = CVT wearing down faster. Straight-cut gears in a gearbox grind more than a CVT do.
As for slipping, that depends on how much torque you're putting through the friction plates/wheels/belts/pullies/etc... Since torque and speed are proportional, one could just gear the area where the cvt can potentially slip to a high rpm, where there's relatively low torque.
And as for materials -- material selection varies with your restrictions, you don't have to have deep pockets to make a really good FIRST competition drivetrain, it's all in the design and how you implement that specific design.
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Yes they are now and for this refer to my final example. they are just making a comeback. CVTs have been in the car industry for a LOOOONNNNG time but they never gained popularity until recently. Yes i know their are exceptions as their always are!