<span style="font-size: medium">Comparison with other information about this Turnigy SK3 2118-2250kv motor:</span><div style="margin-bottom: 0cm">a. Dr Kiwi (Phil M) tested this same Turnigy motor, in Oct 2011 - http://www.rcgroups.com/forums/showp...p;postcount=54</div><div style="margin-bottom: 0cm">b. He used props between 4x4 and 7x3.</div><div style="margin-bottom: 0cm">c. He found results very similar to mine:</div><div style="margin-bottom: 0cm">-With a 4x4 prop @ 7.8V, he found 35W and 120g thrust. With a 4.5x4.1 prop, I found 44W and 134g thrust.</div><div style="margin-bottom: 0cm">d. Dr Kiwi also used the same GWS 5x3 prop that I used, and this allows our data to be compared directly.</div><div style="margin-bottom: 0cm">-At 7.4V, he found 30W and 177g thrust; I found 36W and 182g thrust.</div><div style="margin-bottom: 0cm">e. For the GWS 6x3 prop, @7.4V he found 43W and 255g thrust; I measured 49W and 236g thrust.</div><div style="margin-bottom: 0cm">f. Dr Kiwi also reported g/W values which were quite close the ones I found, for the same props.</div><div style="margin-bottom: 0cm">
Therefore, because my results are nearly identical with those of Dr Kiwi, this validates the thrust stand that I have made, and also the methods and the measurement equipment that I used.</div><div style="margin-bottom: 0cm">There is, however, one small difference between the data of Dr Kiwi data and my data. With similar props and supply voltages, Dr Kiwi generally found prop RPM values which were ~1000 higher than the ones I measured. Dr Kiwi also suggested a Kv of 2340 from his measurements, slightly higher than my estimated Kv of ~2190. The fact that Dr Kiwi could measure slightly higher RPM's in the particular motor he tested, probably accounts for the small difference between the Kv values that we obtained. There is likely to be small variations in individual motors, and the particular motor I tested seemed to have slightly lower RPM's for the same props than the one Dr Kiwi tested. Not every Turnigy 2122 motor will have a Kv exactly at 2250 RPM/V -some will be 100 higher, some will be 100 lower, and that explains the small difference in the Kv's that we find. It seems the Kv of this motor will be around 2250,and probably varies in individual motors between 2150 and 2350.</div><div style="margin-bottom: 0cm">
</div><div style="margin-bottom: 0cm"><span style="font-size: small">User informationabout this Turnigy 2118 motor, on the HobbyKing website:</span></div><div style="margin-bottom: 0cm">There are relatively few user comments on the HobbyKing website about this Turnigy SK3 2118 2250kv motor.</div><div style="margin-bottom: 0cm">http://www.hobbyking.com/hobbyking/s...ner_Motor.html</div><div style="margin-bottom: 0cm">
At least one person mentions using a 6x3 prop with this motor: "... Best moter ever baught. I put it in a multiplex fox with 6x3 propeler,460 mah 3s nano-tech battery and 18-20amp esc. It never gets hot, fly for 4 minutes full throtle, lands on fields without grass and has never problems. Excellent thing ...".</div><div style="margin-bottom: 0cm">There are also other positive comments from users: " ... this motor is awsome have the same as hacker a10 15s and i found the specs for this motor on rcgroups ..."</div><div style="margin-bottom: 0cm">
NOW: THIS IS A BIT CONFUSING -And it is worth mentioning the matter here ....</div><div style="margin-bottom: 0cm">The Turnigy SK3 2118 2250kv is indeed almost identical to the Hacker A10-15 S motor -which has a reported Kv of 2320 and weight 15g. The designated name of the Hacker motor "10-15 S" suggests that it is a 15T motor, however. -Whereas the Turnigy SK3 2118 2250kv that I tested here, is supposed to be an 11T motor. Now, IF the Hacker is a 15T motor, then it should have a much lower Kv than 2320 (since Kv reduces as the number of turns increase). We might therefore expect the Hacker A10-15 S motor to have a Kv more like 1700.</div><div style="margin-bottom: 0cm">-And yet these 2 motors have a almost identical Kv. I suspect therefore, that the Hacker A10-15 S motor may not really be a a 15T motor, and that it may more likely be an 11T motor -like this Turnigy SK3 2118 2250kv. Maybe, the Hacker should be called a "Hacker A10-11 S" motor.</div><div style="margin-bottom: 0cm">-After all, the HYPERION Z1705-11T 2250 KV motor is known to be identical with the Hacker A10-15 S (and is made in the same Sunray factory as Hacker and Turnigy SK3 motors ... ) -and we can, of course, see from its name that the Hyperion is an 11T motor.</div><div style="margin-bottom: 0cm">Also see: http://www.rcuniverse.com/forum/fb.asp?m=11427004
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