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rparigor(at)SUFFOLK.LIB.N
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 Posted: Tue Dec 30, 2008 12:15 pm Post subject: Brass is not a very good conductor |
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Figured would share with the group at just how poor a conductor brass is.
According to:
http://www.kp44.org/ftp/ElectricalConductivityOfMaterials.php
Brass only has ~ 28% the conductivity of copper. (They don't get as
specific as alloy types)
I need to somehow wire my port headrest (negative) to my starboard
headrest. Shortest distance is direct between headrests but using a
traditional wire will be unsightly and make for harder interior install.
It needs to carry enough current to allow an occasional jump start.
Since Ace hardware sells .032" thick brass 1" wide (alloy 260), I was
going to use that and trim it to .75" wide until I researched just how
poor a conductor brass is. Could double the thickness and double the
width, but that would make for more weight and harder interior install.
Anyway, going to use .75" wide by .032" thick copper alloy 110 and glass
it in place with one thin layer of 3/4 oz model aeroplane cloth.
Ron Parigoris
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rv-9a-online(at)telus.net
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| Posted: Tue Dec 30, 2008 5:33 pm Post subject: Brass is not a very good conductor |
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Ron, there has been some discussion on this in the past, and there were
questions about sourcing copper bus bar material.
Van's Aircraft sells bass strips for this purpose, or you can flatten a
copper pipe and use it.
I replaced the brass buss-bars on my RV-9A prior to completion after doing a
voltage drop analysis through the system.
Probably would not make a significant difference, but if you have a choice,
use copper.
Vern Little
Vx Aviation
www.vx-aviation.com
---
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DwightFrye
Joined: 16 Apr 2008
Posts: 27
Location: Cary, NC
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| Posted: Wed Dec 31, 2008 7:55 am Post subject: Brass is not a very good conductor |
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McMaster-Carr (http://www.mcmaster.com/) has copper bar that you can order
from them. I wanted a piece of 1/8" thick 1/2" wide bar, and found it as
part number 8964K291. The downside? It was 3 feet long and cost $13. *sigh*
As you might guess, I have quite a bit left if anyone wants to buy some off
of me.  On the other hand, it made for a really nice/neat/attractive
set of connections between my master and starter contactors, as well as to
my ammeter shunt.
-- Dwight
On Tue Dec 30 20:28:49 2008, Vern Little wrote :
[quote]
Ron, there has been some discussion on this in the past, and there were
questions about sourcing copper bus bar material.
Van's Aircraft sells bass strips for this purpose, or you can flatten a
copper pipe and use it.
I replaced the brass buss-bars on my RV-9A prior to completion after doing a
voltage drop analysis through the system.
Probably would not make a significant difference, but if you have a choice,
use copper.
Vern Little
Vx Aviation
www.vx-aviation.com
---
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david.nelson(at)pobox.com
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| Posted: Wed Dec 31, 2008 8:25 am Post subject: Brass is not a very good conductor |
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As an alternative, you can order P/N 8964K5 (1/8 x 3/4 x 12 copper bar) from
McMaster for $7.33 + S&H.
If you're in the Austin, TX area, stop by or call Westbrook Metals (NE Austin)
as they sell copper bar. Price for 1/8 x 3/4 is a little less than $5/ft but
they get you with a $5 cutting fee (and no, you're not allowed to cut it - I
asked). ;( If you're lucky, you might find a scrap piece.
Just another choice,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
On Wed, 31 Dec 2008, Dwight Frye wrote:
[quote]
McMaster-Carr (http://www.mcmaster.com/) has copper bar that you can order
from them. I wanted a piece of 1/8" thick 1/2" wide bar, and found it as
part number 8964K291. The downside? It was 3 feet long and cost $13. *sigh*
As you might guess, I have quite a bit left if anyone wants to buy some off
of me. On the other hand, it made for a really nice/neat/attractive
set of connections between my master and starter contactors, as well as to
my ammeter shunt.
-- Dwight
On Tue Dec 30 20:28:49 2008, Vern Little wrote :
>
>
> Ron, there has been some discussion on this in the past, and there were
> questions about sourcing copper bus bar material.
>
> Van's Aircraft sells bass strips for this purpose, or you can flatten a
> copper pipe and use it.
>
> I replaced the brass buss-bars on my RV-9A prior to completion after doing a
> voltage drop analysis through the system.
>
> Probably would not make a significant difference, but if you have a choice,
> use copper.
>
> Vern Little
> Vx Aviation
> www.vx-aviation.com
> ---
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