When Rc10's were originally raced, we were limited to run, which turn motor, due to the cells that were available and being able to complete a race without dumping. As cells improved, so we stared to use hotter motors. I remember racing my Rc10 Champ edition with a 11 single motor, but that was with a Stealth gearbox. I would expect the 6 gear box could probably handle a 15 double.
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