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In addition to the better cooling of the drill motors vs the FP's that Joe describes, the 30 amp breakers are better 'protection' for the larger drill motors. The FP motor could be stalled or nearly stalled for several seconds before the breakers would trip, not a good thing for the motor. A stalled drill motor will trip the breaker very quickly. Of course, you shouldn't be stalling motors, but it can happen even if you don't intend for it to.
One of our FP motors failed almost immediately when we lost a pwm signal to the drill motor's Victor on one side of our drive train, resulting in power to the FP motor only.
Our drive train last year used a drill motor and an FP motor coupled end-to-end and driving a drill gearbox for each side of a track drive.
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Team 45, TechnoKats, 1996-2002
Team 1062, The Storm, 2003
Team 233, "The Pink Team," 2004-present
The views I express here are mine, and mine alone, not those of my team, FIRST, or my previous teams.
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Why is it considered shameful to do the smart thing? As the saying goes, "I don't make the rules, I just live by them."
- Chris Hibner [more] 
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