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Old Dec 14, 2005, 12:26 PM
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Is there much difference between 12G & 14G Wire.

Is there really any difference in weight or resistance between 12G & 14G wire considering how much is used in a plane. (probably no more than 40cm all up.

What would make you choose one size over another, is it your connectors, heat shrink insulation size, you want to stay in step with your Motor/ESC/battery's wire guage or just personal preference?
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Old Dec 14, 2005, 01:23 PM
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This short thread might shed some light on the resistance question:

http://www.rcgroups.com/forums/showt...ce#post3670565

30 cm. of #12 "Wet Noodle" silicone insulated fine-strand wire weigs 14.1 grams, same length, same kind #14 weighs 8.3 grams.

- RD
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Old Dec 14, 2005, 01:39 PM
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http://www.cirris.com/testing/resistance/wire.html
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Old Dec 14, 2005, 01:57 PM
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Expunge, remove, make disappear...
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Last edited by RD Blakeslee; Dec 14, 2005 at 02:25 PM. Reason: Thought better of lame humor attempt.
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Old Dec 14, 2005, 03:55 PM
CamLight Systems
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Quote:
Originally Posted by world_hobby
What would make you choose one size over another, is it your connectors, heat shrink insulation size, you want to stay in step with your Motor/ESC/battery's wire guage or just personal preference?
There's not too much difference in weight but if you have a really critical situation, every gram helps.

Where possible, I use the largest gauge wiring I can fit into the largest connector possible. If it's larger than the existing ESC/motor wiring, good! Then I have less of a power loss along the wiring. Wherever possible, I change the ESC/motor/battery pack wiring to a larger gauge too. But, I'm comfortable with disassembling things and soldering on new wiring (with strain relief, etc.).

There isn't a huge practical difference between the two, but if you're concerned about every last bit of performance and can afford to have the extra weight and size, go for it. As long as the extra weight doesn't offset the increase in performance (higher battery pack voltage being delivered to the motors). Only testing can tell you that though.
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Old Dec 14, 2005, 04:12 PM
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RD, you mean you don't use Romex for all your wiring?
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Old Dec 14, 2005, 06:45 PM
know it all
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I use #14 AWG at 45 amps in my twin, the wires are noticeably warm at the end of a fligth.. I should have used #12 instead.

Herm
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Old Dec 14, 2005, 07:58 PM
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*mumble*
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Old Dec 14, 2005, 11:04 PM
know it all
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speaking of romex.. I considered using it in a foamie twin.. solder noodle cable at the ends and middle for the batteries and motors.. it would act like a spar in the foamie wing.. most likely I will use #12 aluminum wire with copper noodle at the ends and middle..6ft of #12 awg copper wire is a lot of weight. Its a 70" wingspan A-26, about 500 watts per motor.

Herm
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Old Dec 14, 2005, 11:23 PM
CamLight Systems
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hemperez, watch out for aluminum's resistance, 1.64 times that of copper.
You might actually be able to use a smaller (lighter) gauge copper wire and have lower power losses in the cable too, compared to aluminum.
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Old Dec 15, 2005, 02:29 AM
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And, be careful of AL to CU splices - they can be a problem.

Bill
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Old Dec 15, 2005, 09:51 AM
know it all
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thanks everyone, so much for that idea..

Herm
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Old Dec 15, 2005, 10:08 AM
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Da Uper
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Aluminum has the lightest weight per resistance(do the research), which is why they use it for power lines. Making connections would be the hard part. Tight mechanical connection with something to prevent oxidation.
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Old Dec 15, 2005, 10:31 AM
Giz
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Quote:
Originally Posted by hermperez
I use #14 AWG at 45 amps in my twin, the wires are noticeably warm at the end of a fligth.. I should have used #12 instead.

Herm
Herm,

The ESC uses the wires as a heat sink. Do you think that your warm wires could be being heated from there?
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Old Dec 15, 2005, 03:44 PM
know it all
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they get hot near the battery, both esc are about 1ft from the battery.. see the attached drawing..

all the wiring is #14, the battery wiring is also #14.. should change that to #12, and the wiring from the connector to the main wiring in the wing to #12 also.

I use 45amp sermos connectors, crimped on. I should measure the voltage drop and see if it is worthwile.

Herm

Quote:
Originally Posted by Giz
Herm,

The ESC uses the wires as a heat sink. Do you think that your warm wires could be being heated from there?
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