Today's Message Index:
----------------------
1. 05:21 AM - Re: Alternator problem....help please. (Steve Sampson)
2. 12:54 PM - Re: Lightweight Cable (Eric M. Jones)
3. 01:09 PM - Lightweight Cable (Fergus Kyle)
4. 07:03 PM - Backup Alternator Orientation (PeterHunt1@aol.com)
Message 1
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| Subject: | Alternator problem....help please. |
--> AeroElectric-List message posted by: "Steve Sampson" <SSampson.SLN21@london.edu>
Joe - thanks! Steve.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Joe
Dubner
Subject: Re: AeroElectric-List: Alternator problem....help please.
--> AeroElectric-List message posted by: Joe Dubner <jdubner@yahoo.com>
Steve,
About a month ago we experienced a similar situation with a Van's
internally regulated alternator for an RV-4 I was helping with. It
"felt like" a short in the wiring but it wasn't; the alternator's
control terminal measured very low resistance (<2 ohms) to ground.
A call to Van's very savvy customer support electrical guy (Ben)
confirmed a bad alternator and Van's quickly got another one on its way
to us. The new one doesn't trip the breaker.
--
Joe
Long-EZ 821RP
Clarkston, WA
On 12-Jun-04 13:00 Steve Sampson wrote:
> --> AeroElectric-List message posted by: "Steve Sampson"
<SSampson.SLN21@london.edu>
>
> I posted this the other day and got no replies so I will try
> again...............
>
> I have wired up the VANS supplied internally regulated ND alternator as
> described in Z-24.
>
> If I put the master to the position that would bring the alternator online
> if the engine was running, the 5Amp OV breaker pops. Is it reasonable for
> the field windings to draw more than 5 Amps when the altenator is not
> turning? (The OV Protection module is not the culprit since if I pull the
> plug for the excitation out of the altrernator, no problem.)
>
> Thanks Steve.
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Message 2
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| Subject: | Re: Lightweight Cable |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
Welding cable is undoubtedly flexible. It is also heavy and the insulation
may or may not be suitable for use in aircraft. (Neoprene is Chlorinated
Polyolefin, and is usually flammable). The clear stuff the Fast and Furious
types uses is heavier yet. But be careful, some weights published are
without insulation.
I designed and built the Super-2-CCA Fatwire to provide the advantage of an
AWG 2 copper cable without the weight. What I got (on a huge spool) is cable
that is much lighter than any possible copper cable with a low resistance
far better than SILVER. True, I was expecting (and calculated) that the wire
would be a bit lighter. But...
Welding cable typically is 277 lbs/1000 feet or 0.277 lbs/foot or 4.43
Ounces per foot. and 90 degC. Super-2-CCA is 69% of this weight with good
flexibility and better 105 degG insulation and enormously better
conductivity (16% better than copper! Holy Moley!).
Anyone who wants a piece of Super-2-CCA for examination for free. Please
email me. I'll send along a piece of RG+142 too. Free!
Regards,
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
Phone (508) 764-2072
Email: emjones@charter.net
Message 3
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| Subject: | Lightweight Cable |
--> AeroElectric-List message posted by: "Fergus Kyle" <VE3LVO@rac.ca>
| Time: 10:33:48 PM PST US
| From: "James Foerster" <jmfpublic@comcast.net>
| Subject: AeroElectric-List: Re: Lightweight cable
| Fergus Kyle wrote:|
| <I note the idea of substituting welding cable as more flexible than its
| <sister size in AWG - however, have you heard of the flexible cable the
| <numbnutters are putting in their souped-up Civics for kilowatt FM amps?
| < Locally here, the car stereo stores are stocking #00 and #4 cable in
| <clear flexible insulation - which I am told meets transport specs for
fire
| <(?) I have checked it and it certainly seems to meet flex needs.>
| Unless one were to use a conduit for this automotive cable, the insulation
is not likely to pass a DAR inspection. John Rourke did some testing of
Tefzel, auto, and welding cable. Here is a partial quote from this Feb 22,
2002 post:
"I also, once upon a time, compared automotive battery cable to welding
| cable and Tefzel (22759-xx) in a 700+ degree solder pot and also with
| flame tests; the automotive cable burned immediately, made thick oily
| smoke and sustained a flame after the source was removed; the Tefzel
| smelled fairly nasty but would not burn right away (and would not
| sustain a flame at all); the welding cable gave off kind of a "hot
| rubbery smell" which wasn't irritationg at all, and would not burn or
| melt, but did swell just a bit."
| Until someone does some testing of this auto sound cable which establishes
that it can withstand heat and abrasion, we should avoid this stuff.
| Fergus, while searching the archives on this topic, your post about
weighing welding cable came up. Something like 55 grams per foot for #4.
Did you weigh the clear insulated auto cable by any chance? I'm curious why
you brought this wire to our attention and am looking for some possible
advantage.
| Jim Foerster, J400, wiring.
Jim,
If I said it was 55gm/foot for #4, I sure hope that's so......
I'm not where I can check. No, I didn't do that as didn't sample any but
just dropped into the car stereo store to see it and any similar bits. The
suggestion came from a fellow ham whose kid was into the hobby of blowing
out brains in a car.
Sorry for any false tip - I was just wondering if any had
preceded me.
Cheers, Ferg
Message 4
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| Subject: | Backup Alternator Orientation |
--> AeroElectric-List message posted by: PeterHunt1@aol.com
Ralph
I have my SB20 backup alternator mounted as you describe (the electrical
connections at 4 o'clock while looking at the back of the engine). I have 2
inches of clearance from the firewall. I am not flying yet, but this arrangement
looks fine to me.
Pete, Clearwater
RV-6, finishing engine installation
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