Quote:
Originally Posted by Tristan Lall
I should probably have been more precise: that's not an efficiency loss in the wheel, but only about 70.7% of the torque available at the wheel can be used for forward motion, because of the sideways component of the wheel's friction force. (I suppose this assumes equal frictional coefficients in all directions.)
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That's a friction dependent limit, though. If your wheels aren't slipping, then you're getting 100% of the gearbox's output torque applied to forward motion. Thus, your "efficiency"/pushing force calculation above is bunk. The drivetrain's forward pushing ability is limited to EITHER 80% of the theoretical output torque of the gearbox or 70.7% of the available friction force, as calculated from mu and the normal force. The two limits are unrelated, so multiplying those two numbers together is meaningless.