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Dec 05, 2016, 08:54 AM
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Martin Irvine's Avatar
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Anyone recognize this motor?


I have a pair of these and have no idea about them. The diameter is 12mm and the length is 20mm. (I have a GWS 3X2 prop on it as that's the smallest I have handy.)

Any idea about what it is, voltage, props and amps recommendations?

Thanks,

Martin
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Dec 05, 2016, 09:57 AM
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I am not a pro on motors by any means, but the three wires lead me to think it's some sort of brushless. You probably already knew that. Next Dave
Dec 05, 2016, 10:16 AM
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coriolan's Avatar
From the color and size it might be the smaller 12mm Feigao or the Blue Arrow copy HK used to sell:
http://www.bphobbies.com/view.asp?id...05&pid=U832265
http://www.bphobbies.com/view.asp?id=V001105
The lower Kv 12mmX30mm works well direct drive with a GWS 3"X2" but the others are meant for GB or Ducted Fan
http://www.bphobbies.com/view.asp?id=A0320074
http://www.bphobbies.com/view.asp?id=A0320082
http://www.bphobbies.com/view.asp?id=A0320083
Dec 05, 2016, 05:43 PM
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Martin Irvine's Avatar
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Looking at the wires coming out of it compared to the Feigao I don't think they are the same.
Actually, the motor wires are thinner than the servo wires, so perhaps I should just put them aside as a safe current would have to be only about 1amp.

Martin
Dec 05, 2016, 11:27 PM
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AntiArf's Avatar
Might be surprised with the current carrying ability, as I've seen some pretty thin leads on BL motors that operate in the 3A range.
Dec 06, 2016, 10:31 AM
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flypaper 2's Avatar
Martin Irvine is one of the pioneers of electric flight in Canada and in cahoots with Keith Shaw, one of the US pioneers. I feel lucky to live in the same city where Martin was a great mentor to all of us when we were getting started.
Thanks Martin.

Gord.
Dec 06, 2016, 12:13 PM
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Martin Irvine's Avatar
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Thanks Gord - very kind.
BTW hows the 9th decade so far?

Martin
Dec 06, 2016, 03:57 PM
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flypaper 2's Avatar
They had a birthday party for me out at the field with a cake. I would have liked to switch the numbers around on it from 80 to 08

Gord.
Dec 06, 2016, 06:17 PM
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Martin Irvine's Avatar
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Oh no - wait a year and you'd be chasing girls again!

Martin

(PS Back too the subject, I'm going to wire them up and run them as a pair on 2S and 3S this evening.)
Dec 06, 2016, 06:51 PM
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AntiArf's Avatar
Without being able to physically see the endbell or know the wiring gauge, it's probably anyone's guess. Maybe it's one of these Constar motors shown here, with power levels that are a bit low for brushless R/C practical use, and probably geared more toward low power machine apps.
http://www.motors-biz.com/products_9...ss-motors.html
Dec 06, 2016, 08:12 PM
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Martin Irvine's Avatar
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Ran them on 2S and 7W each and 3S saw 17W. Rpm in 2S is about 12,500 and 14,700 on 3S. Both batteries were at storage voltage (50%) The rpm difference suggests to me that these are overdriven on 3S and they are a couple of 7-8W motors.

(BTW both end bells are completely plain - no holes.)

Any thoughts?

Martin
Dec 06, 2016, 10:49 PM
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AntiArf's Avatar
I guess the obvious is that the GP and Horizon 10mm inrunner have been shown to survive in the 25W range or even higher, making these a bit impractical for their size and weight. Personally I wish there were more 12mm inrunners available though, as I was and still am a big fan of these motors. Seems they've lost their popularity, partly due to outrunners not requiring gearboxes. I don't want to mention one place (since I may want to buy one of the few they still have) that carries a reputable brand of 12mm inrunner. The 12mm inrunners are a personal favorite for EDF 40 and 50 fans, which are difficult to acquire now. The available outrunner fan setups are more powerful, but the overall weight penalty (approx 3oz batt/fan/ESC) is pretty much unacceptable IMO for smaller EDFs. This is especially true if a person can build light and enjoy the overall benefits of flying a lighter model, thus flying well at lower power levels. The same higher efficiency/lower weight holds true for smaller prop models, although the weight issue is generally not as critical with prop jobs. The last two models I build using 12mm inrunners worked out well, and are easy to fly at their weight:
https://www.rcgroups.com/forums/show...ht-Video/page2
https://www.rcgroups.com/forums/show...w-flight-video


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