<span style="font-size: medium">HOW <u>REPRODUCIBLE </u>ARE THESE RESULTS OF MOTOR TESTING ...?</span></p>

Let me answer right at the start, before I explain a little -
<span style="font-size: small">THE RESULTS ARE ENTIRELY AND COMPLETELY REPRODUCIBLE </span>-There is very little variability indeed in the results obtained for each motor.</p>

1. It is very important to show that these motor testing results are reliable and reproducible, and not just some "random" collection of readings that cannot be relied upon.
2. I am going to be testing motors from the size of a 20g, 1709 stator motor (i.e. A-10 S size) right up to a 600g 5030 stator motor (i.e. A-60 S size). I may test even larger motors. So before really starting, it is important to show that these results are very repeatable and reliable.</p>

I have done this recently, by performing several runs on the same 30-size motor.
For 1 run, I tested the different props in order of increasing size. In the next run, I started with the largest prop, and made the run in order of decreasing prop size. In other runs, I jumped between different props, to see if this made any difference to the results.
All runs gave almost the same readings and results.
I even performed some runs on this motor using a ZTW ESC, and other runs using a SunriseModel-Pro ESC, to see if the ESC made any difference. The runs performed with the ZTW and SunriseModel ESC's gave the same readings, so the particular ESC used made no difference to the results. It is the motor that completely determines the result of this testing.</p>

I show below, the actual datasheets from 2 different runs of this 30-size motor. Lets just compare these:
a. For each prop, the lower voltage reading is for 3S LiPo, and the higher one is for 4S LiPo as the voltage source.</p>

b. We can see that for the 10x5 prop on 3S LiPo, the 1st run gave: 205.7W, 9060 RPM, and 1135g of Thrust.
For the same prop, the 2nd run gave: 199.3W, 9170 RPM, and 1120g of Thrust.</p>

c. For the 13x6.5 prop on 3S LiPo, the 1st run gave: 409.7W, 7070 RPM and 1930g of Thrust.
For the same prop, the 2nd run gave: 387.9W, 7160 RPM and 1955g of Thrust.</p>

d. These figures are all extremely close.</p>

e. Indeed, the figures for all 6 props tested, and on both 3S and 4S LiPo, are very close for the 2 different runs</p>


<span style="font-size: medium">Therefore, the results of motor testing are very reliable and repeatable.
</span><span style="font-size: small">They most certainly can be relied upon, for closely comparing and examining the performance of different brushless motors.


<span style="font-size: x-small">Pics are shown here (I am now using "PHOTOBUCKET" toupload images -and these images can then display on RCU, using the HTML tag for each image): Here are the datasheets:









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