Originally Posted by
jblackburn
Doesn't work. The variance is too high. You just buy a bunch of them and go through them all to find the best. You then see a bunch of "new" motors for sale on rctech and ebay. Buy at hobby store, measure and test, and then sell at a minimal loss. Eventually you go through a good amount of motors and actually have a good one. It isn't fun for anyone, but the cheaper the msrp, the higher the variance, and the more likely to get motor that is better than all the rest. You pay someone $2 a day to wind motors and you don't get quality. Eventually you will get a 20.5T that is "borderline" on the resistance test ... you have a new rocket motor!
I know when we ran Tamiya Mini with a control Ezrun Combo (35A Esc 13T motor) people would buy 4 or 5 motors, and there were differences, one would have a strong rotor another a strong stator, and $400 in motors later you'd have one which made the control but was a beast! The counter for that is "We'll mark the screws so they can't be opened" but that denies users the ability to perform basic maintenance (oil bearings etc) and doesn't change that some motors will be better than others.