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Jun 09, 2016, 09:09 AM
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Mini-Review

2205 high kv shootout: RCX vs GemFan vs Cobra


So I got my hands on some new high kv motors I am super excited about!



from left to right:
RCX 2205 2633kv (not really new, just as a reference)
GemFan 2205 2700kv
Cobra 2204 2850kv


For the test props I decided on:
T5040 (freyblue yeah xD)
5045HBN
T5045HBN
4045BN (work in progress)

The hybrid bullnose tri might be a bit crazy but I always like to push it so why not

ESC is XRotor20A running BLHeli 14.4
FC is a Naze (PIDC disabled)
Tx is a Taranis (0-idle-WOT-idle-0)

Weight:
the Cobra with it's 26g is definitely the lighter one, it's design is pretty much the same as the 2300kv version and we all know, thats a pretty light motor!



the GemFan with it's "thicker" design has a few grams more to cray around, it weights in at 31g. I guess future will tell if it will take more beating that way, it defiantly looks sturdy


and now to the thrust tests, I listed all the runs for each prop in a extra post with the name already saying peak thrust and peak amp draw

So far I can say the Corba will be my choice on lighter builds with "lighter" props, while the GemFan is more willing to push the T5045HBN prop so for a fast track where I can run a heavier setup I will chose the GemFan... and the RCX is clearly in a lower league, though you have to give him some credit for the lower amp draw...

...now you might say... you are overporpping those motors! Well... on the thrust stand amp draw is a lot higher then it's in the air so I feel like those motors will only get pushed to there full potential with 5inc and 4s (btw I stole that RCX2633 motor from a build with KingKong6040 lol)
Last edited by JulianGoesPro; Jun 09, 2016 at 10:17 AM.
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Jun 09, 2016, 09:52 AM
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T5040 Freyblue!

TT2205 RCX2633 T5040 // 1037g @ 28.65A (0 min 8 sec)


TT2205 GemFan2700 T5040 // 1238g @ 38.12A (0 min 9 sec)


TT2205 Cobra2800 T5040 // 1197g @ 37.13A (0 min 9 sec)
Jun 09, 2016, 09:52 AM
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5040HBN <3

TT2205 RCX2633 5045HBN // 1044g @ 28.18A (0 min 9 sec)


TT2205 GemFan2700 5045HBN // 1242g @ 35.75A (0 min 8 sec)


TT2205 Cobra2850 5045HBN // 1213g @ 36.95A (0 min 9 sec)
Last edited by JulianGoesPro; Jun 09, 2016 at 10:08 AM.
Jun 09, 2016, 09:53 AM
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T5045HBN ]:->

TT2205 RCX2633 T5045HBN // 1135g @ 35.76A (0 min 9 sec)


TT2205 GemFan2700 T5045HBN // 1353g @ 43.39A (0 min 8 sec)


TT2205 Cobra2850 T5045HBN // 1275g @ 45.42A (0 min 9 sec)
Last edited by JulianGoesPro; Jun 09, 2016 at 10:09 AM.
Jun 09, 2016, 09:54 AM
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4045BN

TT2205 GemFan 4045BN // 769g @ 31.08A (0 min 8 sec)


TT2205 Cobra2850 4045BN // 721g @ 30.59A (0 min 9 sec)
Last edited by JulianGoesPro; Jun 09, 2016 at 10:07 AM.
Jun 09, 2016, 09:54 AM
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reserved...
Aug 03, 2016, 03:04 AM
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Very nice job Julian

Check my movie:
Testing the Gemfan 2205 2300KV motors (3 min 29 sec)


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