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Old 02-09-2004, 05:02 AM   #1
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Default wire gauge

how does the thickness of the wire make a difference?
and..does 12 gauge wire fit in the lrp qc?

thanks
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Old 02-09-2004, 05:46 AM   #2
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In general, the thicker the wire, the lower the resistance in the wire. To keep the resistance low, it's better with many thin cores, than one thick.

As for the QC, I dont know.
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Old 02-09-2004, 07:48 PM   #3
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so you mean 12 gauge will be better than 14? but will the it affect the battery runtime?
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Old 02-09-2004, 07:55 PM   #4
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the difference is so small that it wont even matter! millionth of a ohm resistance difference is not noticable!

i run 16 gague wire on my 12th and theres no difference, i preformed better too
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Old 02-09-2004, 10:08 PM   #5
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Low currents with thick wire = more resistance, vice versa for thinner wire. We're not dealing with 100000w, so 10 - 18 gauge is fine for whatever.
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Old 02-10-2004, 12:06 AM   #6
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Quote:
Originally posted by rc_square24
so you mean 12 gauge will be better than 14? but will the it affect the battery runtime?
No, it's the opposite, 14 is better than 12 !!!! But as somebody else said, you probably cant feel the difference. Good connectors are more important.
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Old 02-10-2004, 12:17 AM   #7
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Quote:
Originally posted by AzNDRAGster
Low currents with thick wire = more resistance, vice versa for thinner wire. We're not dealing with 100000w, so 10 - 18 gauge is fine for whatever.
Would you rather pump 100 gallons of water through a garden hose, or a 6" PVC pipe?

Thicker = less resistance. Bigger the pipe, the easier it flows.
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Old 02-10-2004, 12:42 AM   #8
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Quote:
Originally posted by Cole Trickle
No, it's the opposite, 14 is better than 12 !!!! But as somebody else said, you probably cant feel the difference. Good connectors are more important.
14 is better than 12??????????


Cole, in AWG (american wire guage) the lower the number, the bigger the wire.


check out this url.

http://www.stealth316.com/2-wire-resistance.htm

It will calculate using ohm's law the voltage drop for all the common wire guages at various wire lengths and amp draws.

Using a smaller wire will kill punch and top end.

Last edited by petzl; 02-11-2004 at 04:34 AM.
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Old 02-10-2004, 01:25 AM   #9
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Quote:
Originally posted by petzl
14 is better than 12??????????


Cole, in AWG (american wire guage) the lower the number, the bigger the wire.
Obviously, I'm not a american. Thanks for correcting me.
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Old 02-10-2004, 01:30 AM   #10
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Quote:
Originally posted by petzl
http://www.stealth316.com/2-wire-resistance.htm

It will calculate using ohn's law the voltage drop for all the common wire guages at various wire lengths and amp draws.
Nice. It also shows, that the shorter the better - but to some extend. A few extra centimeters doesnt matter....

So: Use a reasonably wire, pay attention to the soldering and to connectors.
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Old 02-10-2004, 01:31 AM   #11
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Quote:
Originally posted by petzl
Cole, in AWG (american wire guage) the lower the number, the bigger the wire.
So the thickest wire in the US, is 0 AWG - or do you guys use negative numbers as well????
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Old 02-10-2004, 02:16 AM   #12
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You will never tell the difference if you use 12 14 or 16 gage wire in your car. The smaller wire will not make a difference in what we do. The difference you are thinking you can feel is a thousandth and sometimes ten thousandths of an ohm. Very few meters can measure that so I dont think a human can feel it in his RC car. Any of these 3 sizes would work equally well. The only time it really matters is on a 12th scale car where the wire size affects the motion of the rear pod. I use 16g on my 12th scale for that reason and 12g on the TC just cuz its cheaper and more easy to find.
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Old 02-10-2004, 05:35 AM   #13
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neglect other variables like non linearity in the motor, driver skills etc. the speed loss due to voltage drop is as follows


14 vs 12g -----------.051s/lap
16 vs 14g ------------.081s/lap
18 vs 16g -----------.128s/lap

These numbers are calculated at 1.17v per cell and 10s avg lap time. As the voltage drops, the speed loss gets bigger. Of course there are a million other variables that affect speed. Any one of them could drastically affect these numbers. I have also overly simplified the calculation by assuming that the percent loss is consistant regardless of acceleration and braking.

It would be interesting to see a really good driver collect data on actual lap times vs gauge.
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Old 02-10-2004, 05:41 AM   #14
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Nice work!

By the way, you shouldnt be an engineer ?
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Old 02-10-2004, 05:47 AM   #15
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Quote:
Originally posted by Cole Trickle
Nice work!

By the way, you shouldnt be an engineer ?

Actually I took a job as an environmental chemist 7 mos ago so, technically i am not an engineer anymore

had to switch gears for a bit.
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