NOTES:

• Just because your Motor has a given KV doesn't necessarily mean that it has the grunt (torque) to deliver it. The calculator assumes that it does.



• Cells under load don't deliver the static voltage. A conservative guide is to use 1.05v for NiCd/NiMh and 3.5 for LiPo's



• Try to pick a battery /motor combo that will let the motor run closer to the highest motor RPM recommended. Then pick the pinion to get the desired Rotor RPM. If you are too "low" on the motor RPM for the desired Rotor Speed, you may overheat the motor as you are "lugging" in too high a gear ratio.



• The Max RPM is based on these criteria. You may be able to get a few more hundred at the outset, but once the cell voltage settles on the full load amps, this should  be pretty close.



• If you have multiple reductions, as the Joker does, there are two ways to come up with the effective pinion size:

(1) Treat the first, second, etc. reductions as one pinion, to compare against the main gear. For example, if the first is 24 motor teeth on a 52 tooth intermediate and the second reduction is 14 teeth running against the main gear, the effective Pinion is as if it was a 6.46 tooth running against the main gear ;  i.e.,  (24 / 52) * (14) =  6.46 effective teeth running against, say a 54 tooth main. The answer will be the same.

(2) If you know the overall ration reduction for the transmission, simply divide the Main Teeth / Overall Ratio to get the effective Pinion teeth. If it is  8.8, then the effective pinion teeth will be 54 / 8.8 = 6.136 for a 54 tooth main.

• Input your criteria, then press the 'Update' button to recalculate.