Here is post #17 from, RCU "Electric Pattern Aircraft" section - http://www.rcuniverse.com/forum/fb.asp?m=11467123
Silent-AV8R: <span style="font-size: small">You overlook one very obvious point:</span> The reason that the Gens Ace, the Hacker, the Turnigy SK3 and the Hyperion-Z motors all give totally IDENTICAL results on the Test Stand -is because underneath the purple / silver / blue /green coloured outside wrapper, they are all <u>EXACTLY THE SAME MOTOR UNDERNEATH</u>.

-That is why they all have the very same specs, and that is why on the test stand, they all give totally IDENTICAL resuts -for current, RPM, thrust, everything ....</p>

I am not a dyed in the wool anything fan -I use whatever is best, and I always use the proper tools for the job -including brushless motors.</p>

PLEASE NOTE: I am not just testing "HobbyKing" SK3 motors -I am also testing Hacker, Hyperion-Z, Gens Ace, Foxy, and I will also test some LiPolice motors.
<span style="font-size: small">-So we can eliminate your quite inappropriate comment, about this </span><span style="font-size: small">" ... only being to do with HK ...".</span>
<span style="font-size: small">This whole re-branding business -is a MUCH WIDER ISSUE THAN "HK" or than Hacker...
</span>
What we have here, is the SunRay Technology factory making EXACTLY the same motor for at least 25 different brands -and to hide that they are all exactly the same motor, they just give them different outside colours, and some different shaped end housings ...
<span style="font-size: small">-But inside, underneath the outer clothes, they are all exactly the same ...</span></p>

And for some of these identical motors, depending on their brand name,we end up paying 4 or 5 times as much, for the very same identical motor ...</p>

-Dr Kiwi (Phil M) has also tested many OK Hobby Infinite motors (his test stand will go up tomotors of~100g) and it is very clear from his results that these Infinite motors are ALSO identical with Hacker, Hyperion-Z, Gens Ace, Turnigy SK3, LiPolice etc etc -and come from the same SunRay factory as all the others.</p>

If Hacker really was 10% better, or 20% better, or 30% better, or 50% better than some of the others, then I would not mind paying 3 or 4 or 5 times as much for a Hacker. Not in the slightest ....</p>

<span style="font-size: small">But what I do <u>NOT</u> like </span>-and it is now incredibly clear -is that Hacker is EXACTLY the same motor as: Hyperion-Z, Gens Ace, Turnigy SK3, Common-Sense-RC, LiPolice, OK Hobby Infinite, Shulman Aviation FURY etc etc etc
-And yet we are STILL paying 4 or 5 times as much for a Hacker motor, compared to the others -when it is a completely IDENTICAL motor to all the others ...</p>

<span style="font-size: medium">That, I do <u>NOT</u> like </span></p>