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I'm finding it is darn hard to find places that sell DC motors that actually give enough specs to do any calculations.
So let me understand what we are really calculating here. This is worst case right? . . . Isn't there some room to play on either side of max efficiency? I mean there is a difference between being "capable" of a 5% grade and doing 5% grades all day long right?
This would be the robot going up a 5% grade constantly for an hour with the motors at maximum efficiency right? . . . So maybe robot has a bad day and has to go over a lot of bumps and only gets 30 min. of running time, but on a better day has smooth ground the whole time and gets a good hour run time. I'm ok with that kind of scenario.