Today's Message Index:
----------------------
1. 06:18 AM - Re: AeroElectric-List Digest: 9 Msgs - 08/18/12 (James Meade)
2. 07:04 AM - Re: snorkel for alternator cooling (Robert L. Nuckolls, III)
3. 08:48 AM - Re: snorkel for alternator cooling (jonlaury)
4. 09:31 AM - extra cooling for alternator (Janet Amtmann)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: AeroElectric-List Digest: 9 Msgs - 08/18/12 |
From Wikipedia. See the reference tables to confirm the entry.
"The AWG tables are for a single, solid, round conductor. The AWG of a
stranded wire is determined by the total cross-sectional area of the
conductor, which determines its current-carrying capacity and electrical
resistance. Because there are also small gaps between the strands, a
stranded wire will always have a slightly larger overall diameter than a
solid wire with the same AWG."
http://en.wikipedia.org/wiki/American_wire_gauge
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: snorkel for alternator cooling |
At 11:58 AM 8/18/2012, you wrote:
Thanks to everyone who replied.
Bob N. Thanks for your explanation. No, nothing special about my
alternator installation, N-D in the standard position for a Lyc. I
was only concerned because someone who had done the cooling duct on
an RV6 was concerned because I had none. I thought better safe than sorry.
Added cooling doesn't hurt anything . . . usually.
We added a scupper on the fuselage of the single engine
airplanes at Cessna way back when to bring outside
ram air into the radio stack. I recall a flurry of
activity over that installation when a customer
reported damage to radios due to ingress of rain!
On the other hand, 'things' added to any project
has a cost of ownership in $time$ to install and
maintain that thing . . . and loss of weight and
volume resources for having installed it. Alternator
cooling has been a hot topic of discussion on the
various OBAM aviation forums since I've been
participating. Folks have attributed many failures
of alternators to 'a lack of cooling' but without
supporting evidence.
I have yet to see any MEASUREMENTS of performance
that suggests a reduction of risk for cost or safety
for having added cooling to the alternator.
I'm not suggesting that you should not add the
cooling . . . I have no basis for asserting ANY
justification one way or the other. Intuitively,
I have observed what happens under the hood of
my car for an alternator that gets heavily loaded
in the worst of local temperature and airflow
conditions yet it has hummed along nicely for
11+ years and 170,000 miles . . . without a forced
air cooling feature.
The scat tube is light, the time expended in
the grand scheme of things is small. But it
would be really interesting to know if the effort
has any beneficial effect.
Bob . . .
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: snorkel for alternator cooling |
nuckolls.bob(at)aeroelect wrote:
> At 11:58 AM 8/18/2012, you wrote:
> ... snip
>
> The scat tube is light, the time expended in
> the grand scheme of things is small. But it
> would be really interesting to know if the effort
> has any beneficial effect.
>
>
> Bob . . .
The cooling shroud that I built and the scat tube (7") are a few ounces and part
of the "mission" of this project has been to have fun.Designing and fabbing
this thing qualifies.
Knowing that I was going to build an airplane that was dependent on electrowhizzies
to keep air underneath the wheels, I asked an old-school alternator/starter
repair shop guy (the kind of place with alternators up to the rafters and
huge, antediluvian black machines peppered with large analog meters and cats sleeping
on top) for the best way to keep alternators alive and he said to just
keep the diode plate(s) cool.
So that is what I did. For both alternators [Wink]
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=381243#381243
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | extra cooling for alternator |
Many thanks for all who chimed in on my concern about extra cooling for a
stock alternator. Bob's explanation sound good, and it saves me some work
in not installing something that might or might not have any beneficial
effect.
J=FCrgen Amtmann
<jgamtmann2@gmail.com> RV-6 N188LF
Do not archive
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|