Today's Message Index:
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1. 07:06 AM - Re: Re: Thoughts on a few electrical system configurations? (Robert L. Nuckolls, III)
2. 07:11 AM - Re: Re: Proposed new Z diagram? (Robert L. Nuckolls, III)
3. 09:41 AM - Intercom Install (Saad Mahaini)
4. 10:02 AM - DYI Marker Beacon Antena (MLE)
Message 1
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Subject: | Re: Thoughts on a few electrical system configurations? |
At 04:37 PM 1/8/2014, you wrote:
>
>David,
>
>Suggest you also consider 60A primary alt. and 20A secondary alt.
>Set the regulator on the secondary 0.5V lower than primary
>regulator. I have this in my all glass RV10. After 3 years, I had a
>primary alt. failure due to spun bearing shorting out the winding.
>Bus voltage dropped 0.5V as expected; the secondary alt. picked up
>the slack and we completed our flight at our leisure. With 20A I can
>keep everything lit up indefinitely except my heated pitot and
>landing lights. No bus switching or load shedding necessary.
This philosophy is described in Figure Z-12
which is representative of standby alternator
installations on what must now be more than a
thousand TC Bonanzas, Mooneys, Pipers and Cessnas.
Bob . . .
Message 2
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Subject: | Re: Proposed new Z diagram? |
At 03:56 PM 1/8/2014, you wrote:
><livingjw@earthlink.net>
>
>How do you know that each feed going into your diodes is working?
A cogent question. Any feature added to a
system intended to mitigate risk due to some
failure needs to be 'monitored' for functionality.
This can be a pre-flight test procedure, a
data acquisition system that watches for
anomalous conditions, a periodic investigation
during 100 hr inspections, etc. etc.
The thrust of John's question may not be
obvious . . . it's important that 'failed
features' not be allowed to persist
as latent failures.
The inability to detect such failures has
a tendency to negate their benefits.
Bob . . .
Message 3
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Subject: | Intercom Install |
Hello to the group,=0A=0AI'm in the planning phase of installing a PS Engin
eering PM3000 Intercom in the panel.=0A=0AThis unit has one switched Auxili
ary Stereo Input for music, plus couple un-switched inputs for warnings, et
c=0A=0AI however have two Stereo sources, a harwired Garmin AERA 560 and a
music Aux input jack that i plan to install in the panel as well for extern
al music players such Iphone, etc.=0A=0AThe AERA Audio has XM Stereo music,
MP3 player Stereo music as well as warnings, that's the reason i like to
=0Amaintain it as a stereo music/warning source and not just a mono warning
source =0A=0AI like to have both sources to feed the PM3000 switched Stere
o Aux Input simultaneously, not thru an A/B =0Aswitch.- =0A=0AI was wonde
ring what you will=0A recommend that i use to properly combine and isolate
the two inputs. =0A=0AI'm debating if i should just =0Ause passive combinin
g/isolation circuit (resisters in line with both =0Asources) or if i should
consider using an active circuit similar to the =0AAMX-4A (previously VX E
ngineering)- or something=0A similar if such a thing exist in the market.
=0A=0AJust seeking input from people that may had to cross this bridge befo
re and have some recommendations=0A=0A=0AThanks=0A=0ASaad
Message 4
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Subject: | DYI Marker Beacon Antena |
Roger,
I followed Bob's advice when building my RV-6A. ran a piece of cable from
my radio to the firewall and used a bulkhead BNC connector to get to the
front side of the firewall. I then took a piece of cable about 48" long
and attached a female end on that for the forward connection and proceeded
to strip 40" of the sheath from the cable. Subsequently I fiberglassed that
to the inside of my cowling running forward horizontally. Works fine and
I've not ever forgotten to disconnect the cable from the firewall when
removing the cowling.
YMMV
Marty, RV-6A N826ME
Time: 09:07:15 AM PST US
From: "Roger & Jean" <mrspudandcompany@verizon.net>
Subject: AeroElectric-List: DIY Marker beacon antenna
I have a wooden airplane in which I will be installing a Marker beacon
receiver.
My question is: Is it relatively simple to fabricate an antenna, or should
I consider purchasing one?
I assume it can be put on the inside of the airframe without a significant
loss of signal strength.
Roger
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