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Originally Posted by sanddrag
EDIT: I'd prefer not to work with any fancy spreadsheets for the purposes of my questions to you. I'd just like to see how you came up with the 742 rpm. Thanks.
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From what I gather, here's how the 742 rpm was achieved.
Initial Reduction: 12:60 -- 0.2
Second Reduction: 60:30 -- 2.0
Sprocket Stage: 10:24 -- 0.083
Total Reduction = 0.2 x 2.0 x 0.083 = 0.167 (1/6)
Wheel RPM = Motor Free Speed * Reduction * Drivetrain Efficiency
= 5500 * (1/6) * 0.81
= 742.5 RPM
EDIT: Hognabbit, John beat me too it...