<span style="font-size: medium">SO: WHICH MOTOR MIGHT BE THE &ldquo;THE BEST ONE &ldquo; ? Turnigy SK3 3542-1000Kv or Hacker A30-12L ?</span></p>

Well, obviously these two motors are extremely close to each other. As far as performance is concerned, it is like looking at two Turnigy SK3 3542 motors, or two Hacker A30 motors, rather than one Turnigy SK3 and one Hacker motor -they are that close.
-However, there ARE some small differences between the individual examples of each motor that I tested, and it is worth pointing these out.
Now, of course one motor costs $27, and the other costs $101 (in Europe; in USA the Hacker is $66.99). But for the purpose of this comparison, let's pretend that they both cost $60 -so that price does not affect our comparison of performance and other properties.</p>

<span style="font-size: small">1. The Turnigy SK3 3542-1000Kv has better performance than the Hacker A30-12L
</span>If we compare the datasheets and graphs for the Turnigy and Hacker motors, shown in posts #5 and #6, and in #11 and #12, then we can see the following'
For the 13x6.5 prop on 3S LiPo:
Turnigy SK3 gives 1760g Thrust for 35.5A and 406W.
Hacker gives 1720g Thrust for 39.5A and 372Wg
-The Turnigy SK3 gives slightly more Thrust for a lower current.</p>

For the 14x8.5 prop on 4S LiPo:
Turnigy SK3 gives 3070g Thrust for 70.4A and 964W
Hacker gives 3060g Thrust for 77.6A and 1016W
Once again, The Turnigy SK3 gives slightly more Thrust for a lower current.</p>

For the Turnigy SK3, there was less of a fall-off in performance with the 15x8 prop, in comparison to the Hacker.
Overall then, the performance of the Turnigy SK3 is marginally better than the Hacker motor.</p>


<span style="font-size: small">2. The Turnigy SK3 3542-1000Kv is lighter than the Hacker A30-12L
</span>The Turnigy SK3 motor by itself weighs 141.1g. The hub prop adaptor weighs 10.2g. The two together weigh 151.3g.
The Hacker A30-12L motor weighs 150.3g by itself. The hub prop adaptor weighs 17.9g. The two together weigh 168.2g</p>

<span style="font-size: small">So: The Turnigy SK3 motor is lighter than the Hacker, by 18g.</span></p>


<span style="font-size: small">3. The Turnigy motor has lower No-Load Current than Hacker</span>
With 3S LiPo, the Turnigy had a No-Load Current of 2.1A; With 4S LiPo it was 2.5A.
The Hacker, however, had a No-Load current of 2.7 A with 3S LiPo; and with 4S LiPo it was 3.5A</p>


<span style="font-size: small">4. The Turnigy SK3 motor mostly had similar specs to those given by HobbyKing (HK).
-Whereas the Hacker motor didNOT have the specs quoted by Hacker.</span></p>

a. HK quote a weight of 141g for the Turnigy SK3 3542-1000Kv -and it did indeed weigh 141.1g
-Hacker quote a weight of 143g for the A30-12L, and it actually weighed 150.3g.</p>

b. HK quote a Kv of 1000 for the Turnigy SK3 3542-1000Kv, and PeakEff calculated a Kv of 1008.
Hacker quote a Kv of 1000 for the A30-12L, and PeakEff calculated a Kv of 976.</p>

c. HK do not quote a No-Load current for this motor. Hacker quote a No-Load current of 1.8A for the A30-12L, where in reality it was 2.7 A with 3S LiPo; and 3.5A with 4S LiPo.</p>

d. The quoted dimensions for the Hacker motor are confusing. Hacker themselves quote a length of 42.85mm, whereas AeroModel quote a length of 46mm. None of these quoted lengths were correct. As stated in post #4 of this thread, the main motor body had a length of 39mm, and with the hub on the rear housing the total length of the motor was 49mm.</p>

HK quote a total length of 43mm for the SK3 3542-1000Kv, and this was correct -I actually measured a total length of 44mm for this motor, but what is 1mm between friends &hellip;?</p>

5. The values of Internal resistance quoted by both HK and Hacker were far below what I actually measured. HK quote an internal resistance of 31mOhn, and I measured 70mOhm. Hacker quote an internal resistance of 30mOhm, and I measured 58mOhm.</p>


<span style="font-size: medium">SO: WHICH OF THE TWO MOTORS IS BEST ?
</span><span style="font-size: medium"> Well, the Turnigy SK3 3542-1000Kv is lighter and has slightly better performance than the Hacker A30-12L.
So: If the motors were the same price, I would buy the Turnigy SK3 3542-1000Kv in preference to the Hacker A30-12L.
</span></p>