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Originally Posted by sabongi
was thinking about efficiency X RPM, so we can gear properly :D
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Hmmm, well motor efficiency can't be plotted against RPM. Efficiency is based on power, which is torque X RPM. You can plot efficiency vrs RPM with a constant torque but that by itself doesn't mean anything for gearing.
Efficiency with no load is zero at any RPM (because no work is being done.) So it only makes sense to measure efficiency on a torque curve.
Gearing shouldn't be based on an efficiency curve anyway -- it should be based on RPM -- and like I said, RPM by itself doesn't have anything to do with efficiency. It only makes sense when you know both torque and RPM.
I recommend that you use Brian's excellent gearing program, you will do much better in the long run. :)