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[i]Now I can adjust both speeds to run as fast as possible on any given track, depending on how many curves and straightaways it has.
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Wouldn't it be easier to adjust the speed by changing motors or gears? If it is too fast with three cells, then just use two cells. Now if you could adjust the pot from the transmitter while driving (can you say proportional speed control) then it would be worthwhile. I don't mean to knock your mod, just seems like a lot of extra hassle. BTW it is kind of cool though.