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I've seen simialer ideas carried thru in super mileage vehicles, mostly because they can disengage the drive and coast without drag, and from what I saw that is really the only advantage, friction drive, by nature is not efficient, it is also high wear, when you are trying to get one part to rotate another part it is best to have them as close to possible to being in the same plane, other wise you end up with alot of wear, and alot of heat, the designs that work on simaler ideas as yours that are pushing a 80lb vehicle + 140lb driver tend to wear out within about 20 miles, but that is acceptable if they only have to travel 10 miles to win, it's when they had other problems and had to make more runs around the track, at that point their drive train started to wear out and parts failed.
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