Quote:
Originally posted by Rob Colatutto
And don't use the free speed, just the normal load speed of the motors.
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I usually use the free speed, then just put in a 15% "speed loss" to compensate for drive friction. It is hard to pre-determine the load a motor will see from the gearbox itself (the only load acting on the motor when it is running straight out across the field).
Otherwise, Rob, Matt, AND Jnadke have the formula right, the only thing you need to take into account is unit conversion. (personally, I prefer doing it all in metric and RPM, then converting to fps and lbs at the very end).