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Originally Posted by Andrew
Another thing to think about...
If the FP GB was designed to work with this motor at 6v, what are the plastic gear teeth going to do when you stall it at 12v?
Is it reasonable to expect that they over-designed the gear teeth by a factor of 4x? (2x to account for the 2x of the motor and an additional 2x so that you have your standard safety factor.)
In 2002, we pushed the FP gear teeth beyond their normal operating range and spit out teeth in every match.
Just one more thing to watch out for.
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The last stage of the F-P gearboxes is not strong enough for a drivetrain; not comfortably anyway. Modifications that 188 made in the (distant) past included metal gears in the last stage, and new (metal) shafts for all of the gears, to replace the plastic ones. We've avoided the F-P gearbox altogether since 2000.