The SP BLA is usefull in a particular manner. I found it most useful when comparing motors of the same wind and make to each other. I look at the KV and RPM readings with no load on the motor, and then I use a fan attached to the shaft to simulate a small load. I look at the KV and RPM values again. The stronger motors show a smaller decrease in RPM and KV with the load applied. I found it difficult to compare motors from different manufacturers however. I believe this is because they all come with slightly different std timing values which skews the RPM drastically. I haven't had the time to thoroughly investigate the means necessary to compare different makes of motors, but I suspect a meaningful comparison could be made by adjusting the timing on the motor untill the two makes read the same RPM value for a given voltage. then take the difference raeadings at that point and see which is the stronger of the two. I did find that the results were very repeatable. Not to mention it allows you to test differences in ESC settings and software as well.
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
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