Today's Message Index:
----------------------
1. 06:11 AM - Grounding strap (Fergus Kyle)
2. 06:17 AM - Grounding strap/wire (Fergus Kyle)
3. 06:22 AM - Re: Ground wire (Gary Casey)
4. 08:08 AM - Re: Ground wire (Eric M. Jones)
5. 08:49 AM - Re:Flat grounding cable (Alex Balic)
6. 09:23 AM - Re: Re:Flat grounding cable (Matt Prather)
7. 10:57 PM - Diode on starter relay (solenoid) (Jim Anglin)
Message 1
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--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
"
Time: 04:59:32 AM PST US
From: "Gary Casey" <glcasey@adelphia.net>
Subject: AeroElectric-List: Ground wire
--> AeroElectric-List message posted by: "Gary Casey" <glcasey@adelphia.net>
I plan to use a flat braided ground cable for my rear-mounted battery, but
I'm having trouble finding some. Aircraft Spruce will sell a 2-gage cable
by the foot at something less than $1 an inch (ouch). But I would like to
have something heavier than that and Alpha makes cable in either 3-gage or
0/2, which is what I would prefer. Unfortunately, the only way I can find
it is by the 100-foot reel. Anyone know of a way to buy this stuff in
shorter lengths? Or do you think the 0/2-gage is an overkill? I will be
cranking an IO-540 in my plastic airplane. Gary Casey LES #157"
Gary,
It's been a tradition of hams to use the outer braid of coaxial
cable for grounding straps. RG8 (common 1/2" cable) braid will carry about
20A or more so you would have to add copies in parallel to accomodate higher
current. Many hams throw out the cable (it deteriorates as constant
impedance over several years) and you might acquire same from locals, strip
cover and press braid off the internal insulation. If you take the trouble
to strip the central wire out of the insulation and thread it through the
braid, then pound flat, you can carry 40A fairly safely.
Ferg, Europa A064
yeah, but the price is right
Message 2
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| Subject: | Grounding strap/wire |
--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
There's another alternative to welding wire for fat grounding - apparently
the kids are wiring their junkers with heavy-duty power cable to accomodate
the vital thumpthump 'music' which must be pumped out of their jalopies at
100db. I priced some at the local autoradio shop and it's not bad in short
lengths. The usual sizes are #2-0 and 4.
Ferg
Europa A064
Message 3
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--> AeroElectric-List message posted by: "Gary Casey" <glcasey@adelphia.net>
<<Buy my Fatwire. Lighter than AWG 2. The insulation comes off without too
much trouble if you want to run a bare cable.
Regards,
Eric M. Jones
www.PerihelionDesign.com>>
A most excellent suggestion and I didn't know that your wire is now
available. Compared to prices I have found from various sources the cost of
weight saved for your wire comes out to about $28 a pound, a bargain
compared to other methods. In that case I might change my design around and
use one of your insulated wires for the ground return instead of a braid.
But what does your wire look like if the insulation is pulled off? Wouldn't
it tend to unravel even if it is twisted (some wire is twisted, but most
isn't)?
Gary Casey
Message 4
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--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
--> AeroElectric-List message posted by: "Gary Casey" <glcasey@adelphia.net>
>A most excellent suggestion and I didn't know that your wire is now
>available.
Yep, A giant spool of Super-2-CCA sits ten feet from me.
>Compared to prices I have found from various sources the cost of
>weight saved for your wire comes out to about $28 a pound, a bargain
>compared to other methods. In that case I might change my design around
and
>use one of your insulated wires for the ground return instead of a braid.
>But what does your wire look like if the insulation is pulled off?
Wouldn't
>it tend to unravel even if it is twisted (some wire is twisted, but most
>isn't)?
>Gary Casey
The wire is made up of 15 groups of 17 wires of AWG 23 (0.0226") Copper-Clad
Aluminum, all twisted. It won't unravel easily.
By the way, regarding Ferg's comment on coaxial cable wearing out---Quite
true! A high-powered transmitter can change the characteristics of a cable
in reasonably short order. So buy my RG+142.
Regards,
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
Phone (508) 764-2072
Email: emjones@charter.net
"So in the ninth inning; score is tied, bases loaded; two outs; ---when
suddenly an angel came down from Heaven and knocked the ball out of the
park. Some say it was a miracle, but others say it was just a lucky
ng." --Anon
Message 5
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| Subject: | RE:Flat grounding cable |
--> AeroElectric-List message posted by: Alex Balic <alex157@direcway.com>
Gary-
I am using braided hose cover fro my ground strap- it is normally used to
dress up radiator hoses in cars- I bought an entire "kit" to do a 350
Chevy - cost about 25 bucks and it has an entire assortment including about
6' of some heavy gauge in there for the radiator hoses- it is at least #2
since I had to really compress it to fit into the swage connectors- it is
made from tinned copper just like the expensive stuff from spruce- you can
get it from any auto supply, but I ordered mine from summit racing...
Alex
Message 6
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| Subject: | Re: RE:Flat grounding cable |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
Are you sure its tinned copper, and not stainless (or tinned
steel)?
Regards,
Matt-
N34RD
> --> AeroElectric-List message posted by: Alex Balic
> <alex157@direcway.com>
>
>
> Gary-
>
> I am using braided hose cover fro my ground strap- it is normally used
> to dress up radiator hoses in cars- I bought an entire "kit" to do a 350
> Chevy - cost about 25 bucks and it has an entire assortment including
> about 6' of some heavy gauge in there for the radiator hoses- it is at
> least #2 since I had to really compress it to fit into the swage
> connectors- it is made from tinned copper just like the expensive stuff
> from spruce- you can get it from any auto supply, but I ordered mine
> from summit racing...
>
> Alex
>
>
Message 7
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| Subject: | Diode on starter relay (solenoid) |
--> AeroElectric-List message posted by: "Jim Anglin" <jlanglin44@earthlink.net>
I have my HR II all wired and my neighbor showed me a wiring diagram of a
starter solenoid with a diode between the S terminal and ground. I have
owned 3 planes that didn't have this. What is the thinking behind this? I
also have Van's RV-8 wiring schematic that comes with the wiring kit and it
doesn't call out a diode. However, the diagram I saw with the diode was
from Van's.
?????????
Jim
HR-II #153 flying soon............
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