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Old Mar 31, 2009, 11:47 AM
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Question
How do I wind a double for 180 watts????

first off I have searched and searched. Also gone through the gobrushless webpage mulitiple times and cannot find how to wind my gbx2 to get 180 watts with a 9x3.8 sf or 'apc e' on a 3s lipo.

Went from 70 watts with 18t wye to 300 watts with 9 turns of 22awg.

Please help
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Old Mar 31, 2009, 12:04 PM
It's all fun till Crunch!
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http://www.rcgroups.com/forums/showthread.php?t=587549

This has it all. Long but worth the effot to learn, what you are asking is very complex and "double" really has little to do with the Kv or Kt, just describes how many physical wires make up a "turn" in winding language. The use of a large number of wires in making a turn determines the Internal Resistance of the winding, ie the maximum current that can be handled before overheating.

When I've made motors I usually use 6 or 8 strands of small wire to max the copper fill to reduce the internal resistance, Rm = Resistance value of the motor, derived from the guage of wire used.

Hope this helps,

Crunch

PS, my guess is going to a 12 turn Y might just do it.
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Old Mar 31, 2009, 12:06 PM
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Getting 300 Watts from a GBX double is possible, but it's not going to spin a 9" prop without a gearbox. You're limited to about 210 Watts max to direct drive a 9". If you are a skilled winder, you can pack 11 turns of 22AWg wire into that stator. Terminate it WYE.

This will require 5 turns on the first layer, 5 turns for the second and 1 turn for the third. I suggest using a credit card/gift card/broken prop to compress the wires to get all 11 turns in there. I would wind the whole motor as a 10 turn and leave a decent tail hanging off each phase then wind each pole one more time for the final layer.

-Alex
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Old Mar 31, 2009, 12:11 PM
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I almost forgot, a 19 turn Delta with 24AWG works well too. Again, you rally shouldn't go beyond 20 Amps (about 210 Watts). This one is 7,7,5. Again, this is a really advanced wind. In my opinion, the 22 AWG 11 turn is easier.
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Old Mar 31, 2009, 12:13 PM
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What about running maybe 13 turns of 24awg??...my gut tells me this would be ~170 watts with a 9" prop but I have only 24 and 22 gage wire..
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Old Mar 31, 2009, 12:15 PM
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Quote:
Originally Posted by Capt. Crunch
PS, my guess is going to a 12 turn Y might just do it.
The 12T WYE will work, but he'll have to step down to 23 AWG to make it fit. Max power would be about 180 Watts. This might be a little easier than the 11 turn 22 AWG.

-Alex
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Old Mar 31, 2009, 12:19 PM
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Quote:
Originally Posted by going4speed
What about running maybe 13 turns of 24awg??...my gut tells me this would be ~170 watts with a 9" prop but I have only 24 and 22 gage wire..
13 turns 24AWG WYE will max out around 150 Watts (14 Amps). You can certainly acheive better copper fill with a larger wire. That wind will work with 23 AWG too.

PM me your address and I'll mail you some 23 AWG if you want to try it. No charge I get the stuff from a motor rewind shop down the street for $4/lb. Awesome stuff, but it's a pain to solder due to the incredibly high temperature of 220 degrees Celcius rating.
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Old Mar 31, 2009, 12:24 PM
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Quote:
Originally Posted by IBCrazy
... it's a pain to solder due to the incredibly high temperature of 220 degrees Celcius rating.
Aspirin trick does not even work for that wire?

Have you showed (flown, let fly) your motors/models to them? Reactions?

Vriendelijke groeten Ron
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Old Mar 31, 2009, 12:34 PM
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What exactly does the aspirin do?

Quote:
Originally Posted by Ron van Sommeren
Aspirin trick does not even work for that wire?

Have you showed (flown, let fly) your motors/models to them? Reactions?

Vriendelijke groeten Ron
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Old Mar 31, 2009, 12:42 PM
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Remove insulation coating. Method described in first post, item #27
http://www.rcgroups.com/forums/showthread.php?t=240993 (sticky in this subforum)

Must contain aspirin, not just any pain killer.
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Old Mar 31, 2009, 01:13 PM
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Favorite motors

I've never tried that. I usually use a torch and get the wire red hot then use 22 grit sand paper.

I've got some of my motors so hot the magnets have come unglued but the wire insulation is never discolored. It's even melted the stator insulation. It's polyamideimide coated wire. The copper turns red just as the insulation begins to burn.

Also, yes I have wound at least 70 motors. Many GBX doubles and triples. I can't say which I like more, the Scorpions or the GBX's. Awesome motors!

My favorites:

GBX double:

8 turn, 8 magnet 22 AWG WYE (2500 kV) - I have two of these on my ForkTail Devil, a high speed P-38.

GBX triple:
10/3 turn (10 turns per pole 3 wires in parallel), 12 magnet 22AWG WYE (46 Amp 2625 kv speed motor) - This one is on my Diablo , a 120 mph scratch built pylon racer that flies on a 3S (I only run 36 Amps on it but it's capable of 46).

4 turn, 10 magnet 3 strand 24 AWG wYE (39 Amp 2625 kV speed motor) - This one is on my "Projectile" a 110 mph scratch built flying Wing which draws about 32 Amps from a 3S Lipo.

4 turn, 12 magnet 3 strand 24 AWG WYE (2150 kV). I fly this on my modified Strykers with an APC 6X5.5 E prop @ 29 Amps. I get about 85-90 mph depending on how much modification I have done to the body.

Scoprion 3008:
15 turn 22AWG Delta (32 Amp 1250 kV Power motor)
5 turn, 10 magnet YY (parallel WYE) with 6 strands of 23 AWG (3 strands per pole pair). This one I have yet to fly but it tested at ~2260 kV. Right now it is destined for a high speed biplane.

Scorpion 3014:
10 turn YY (parallel WYE) with 4 strands of 24 AWG (2 strands per side)~ 1120 kV. This motor rocks with an 11X8 folder! I have these on my hotliners for 30-40 mph vertical climbs on a 3S!

-Alex
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Last edited by IBCrazy; Mar 31, 2009 at 01:25 PM.
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Old Mar 31, 2009, 06:30 PM
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Wow those are some HOT winds.

Manuel I cannot find that post on asprin?
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Old Mar 31, 2009, 06:49 PM
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Method described in first post, item #27:
http://www.rcgroups.com/forums/showthread.php?t=240993 (sticky in this subforum)

Must contain aspirin, not just any pain killer.
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Old Mar 31, 2009, 07:11 PM
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Duh I was looking at post #27. Thanks

Quote:
Originally Posted by Ron van Sommeren
Method described in first post, item #27:
http://www.rcgroups.com/forums/showthread.php?t=240993 (sticky in this subforum)

Must contain aspirin, not just any pain killer.
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