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Old Jul 21, 2014, 06:06 AM
NX-687 is offline
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Joined Aug 2007
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Yo

Im getting back in the saddle ,

just ordered a 3000 and some 4 inch props

Ive got 2 off CC18's , not quite enough

Testing coming up , lucky I have a Whatsit doing meter now

I have a prop in the slot F22 thats does not really want to turn right , and a wound approx 25 gram motor someone gave me , and 2off 1300 RW 's , also got 2S 800"s and 3S 950 's , big power there , if I can just unlock it
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Last edited by NX-687; Jul 22, 2014 at 03:32 AM.
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Old Jul 29, 2014, 02:43 PM
SilbernerSurfer is offline
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I dont like crashes!
Germany, BY, M
Joined Jul 2013
1,670 Posts
Where can i get bearings for this motor?
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Old Jul 29, 2014, 05:48 PM
jackerbes is offline
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Jack
USA, ME, Ellsworth
Joined May 2008
18,022 Posts
Head's Up RC, Avid RC, RCBearings.com, Go Brushless/Micro Dan, Strong Motors, just to name a few.

But to get the right bearings you have to remove your old bearings and measure them as there were versions and changes that differences in the sizes of bearings in motors with the same model name.

Jack
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Old Jan 31, 2015, 07:41 AM
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Joined Jan 2015
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13T 0.53mm w/o insulation =approx 23.5AWG Blue Wonder

In case these 2 identical motor rewinds get destroyed while prototyping my VTOL project, I've taken some pics. I did a lot of rewinding. Detailed otes made at the time now lost in heaps of files.
Just for reference. Very, very difficult wind. No air space left at all. Soap as lubricant for last layer to ease threading. Needed two or three goes for these two motors.
Recent test =
Generic chinese 6 x 4.5 props.
3.85 A 11.2 V Zippy 1000mAh 3s LiPo
295g static thrust. I know this for certain because the thing lifts off the ground with the meter leads trailing!


Also used with 4.1:1 helical spur gearbox on 17 x 13 Balsa/Glass cloth laminate prop.
11 A 14.8 V (2 in series) old Impact 2s 1350mAh LiPo
1450g static thrust measured with L arm balance.
Small 30mm computer fan blade on exposed rear shaft, not needed as motor ran nice and cool to touch after flights.
Near vertical take-off at half power with 48" biplane on video link here:
biplaneonsnow.wmv (1 min 49 sec)
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Old Jan 31, 2015, 08:41 AM
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Just remembered I did a recent test on a 2s Lipo while building my VTOL prototype.
Generic 6 x 4.5 Chinese prop
3.1 A 7.4 V 2s old thunderpower 1200mA Lipo
200g static thrust ( measured with improvised threewheel cart mount pushing horizontally on diet scale. Not very accurate method. Tried to even out friction by taking average scale readings using push and release and pull and release with the cart).

By the way, the neatness of the final turns in these winds may not satisfy an accountants nib. But these are for getting the best performance in flight and that's what counts. I started with 10kg of this very high quality motor-winding 0.53mm wire, so could afford to strip off winds after testing. The neatest were definitely not the most efficient because that usually meant a lot less copper was being used. If you plan ahead and rehearse how the layers are going to fit together, the turns needed are possible for maximum efficiency. Way better than the original manufactured birds nests or blind granny's knitting!
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Old Jun 11, 2015, 07:40 PM
basicguy is online now
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Ayn Rand Sez.............
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United States, MO, La Plata
Joined Dec 2014
570 Posts
I rewound a Hextronix 2730 motor (The stator is .88x.18" 12p 14 magnets) with two strands of 28, DLRK, 12 turns wye. It give 1540 kv using the lathe technique.

I got the idea from this chart on page 8 of this thread
redwhiteandbluewonder
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Last edited by basicguy; Jun 12, 2015 at 06:22 AM.
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Old Jun 21, 2015, 12:04 PM
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Estonia, Harju, Tallinn
Joined May 2012
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Has anyone used one of these motors?
http://robotbirds.com/catalog/produc...af475af8fb650c

How's the overall quality? Do they have 0.2 mm laminations?
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