Today's Message Index:
----------------------
1. 04:45 AM - Re: Transponder (Wayne Williams)
2. 08:08 AM - Re: lectrical planning per Aeroelectric (Matt Prather)
3. 10:17 AM - GNS-430 Wiring (F1Rocket@comcast.net)
4. 02:41 PM - Re: lectrical planning per Aeroelectric (Kevin Horton)
5. 05:40 PM - Voltage regulator problem? (Eric Schlanser)
6. 06:34 PM - Re: Voltage regulator problem? (Brian Lloyd)
Message 1
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--> AeroElectric-List message posted by: "Wayne Williams" <rwayne@gamewood.net>
I have the antenna at aircraft centerline just behind the baggage area near
the front of the tailcone on the bottom. It's well away from the landing
gear and comm antennae.
Thanks.
Wayne
me: 11:35:34 AM PST US
From: Jim Ziegler <jamescraigziegler@adelphia.net>
Subject: Re: AeroElectric-List: Transponder troubleshooting
--> AeroElectric-List message posted by: Jim Ziegler
<jamescraigziegler@adelphia.net>
Where is the antenna located on the aircraft?
>
> From: "Wayne Williams" <rwayne@gamewood.net>
> Date: 2004/06/08 Tue PM 08:58:02 EDT
> To: <aeroelectric-list@matronics.com>
> Subject: AeroElectric-List: Transponder troubleshooting
>
>
--
jim Ziegler <jamescraigziegler@adelphia.net>
Message 2
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| Subject: | Re: lectrical planning per Aeroelectric |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
Most of the items on the e-bus in z-11 are of the much-less-than-1A
variety (voltmeter, intercom, gps, turn coordinator, com (1.2A when
transmitting) and txp). If you pick LED's for the panel flood, that's less
than 500mA. The only item that has potential to be a hog is the boost
pump.
Matt-
N34RD
> --> AeroElectric-List message posted by: "Ross Schlotthauer"
> <rv7maker@hotmail.com>
>
> Hi All,
>
> I thought that I had my electrics all layed out, and mostly installed
> until I started wondering about my e-bus architecture. Per
> Aeroelectric figure Z-11, Bob puts a s*&% load of stuff on the e-bus
> and runs it all off a 7A fuse. What the heck? And the feed from the
> main bus, through the diode is on 16 GA wire (11A max). What am I
> missing? My layout is more like Z-11 for the all electric variety, but
> I would think that I need to size wire, fuses, switches, and diode for
> a situation where everything is on. Is this a difference in fuse
> ratings and actual loads?
>
> Thanks,
>
> Ross Schlotthauer
> www.experimentalair.com
> RV-7 wiring (head scratching)
>
> http://join.msn.click-url.com/go/onm00200361ave/direct/01/
>
>
Message 3
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--> AeroElectric-List message posted by: F1Rocket@comcast.net
Can someone send me a copy of the Garmin 400 Series Installation manual? You can
send it direct to f1rocket@comcast.net.
Thank you.
Randy
Message 4
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| Subject: | Re: lectrical planning per Aeroelectric |
--> AeroElectric-List message posted by: Kevin Horton <khorton01@rogers.com>
>--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
>
>The only item that has potential to be a hog is the boost
>pump.
>
>Matt-
>N34RD
>
But, for most aircraft, the electric boost pump isn't needed to
complete the flight. So, it probably doesn't need to be on the
E-bus. The probability of an main alternator failure and an
engine-driven fuel pump failure on the same flight is very low. If
you have the very bad luck to have both those failures on the same
flight you could bring the main bus back on line to get power for the
boost pump and then do manual load shedding by turning off unneeded
items.
--
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://go.phpwebhosting.com/~khorton/rv8/
Message 5
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| Subject: | Voltage regulator problem? |
--> AeroElectric-List message posted by: Eric Schlanser <eschlanser@yahoo.com>
Can someone help me with an answer to this fellow's regulator problem? I think
he is on the right path but am not certain.
Thanks in advance, Eric Schlanser, Kalamazoo, MI. Just starting the electrical
system in my Wittman Tailwind W-10 project with Lyc O-320.
Eric:
I own a 1958 Piper Comanche 250.
Before engine start, the "Battery Charge" voltmeter on the instrument
panel
reads 12.6 Volts.
After starting the engine, the "Battery Charge" voltmeter on the
instrument
panel reads 14.1 Volts.
In flight, the "Battery Charge" voltmeter will increase up to 14.9
Volts
(almost in the red).
Is 14.9 Volts too high? Should I try to correct this situation? Could
the
Voltage Regulator be bad, or possibly Alternator putting out too much
voltage?
Thanks,
John
---------------------------------
Message 6
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| Subject: | Re: Voltage regulator problem? |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Eric Schlanser wrote:
> I own a 1958 Piper Comanche 250.
>
> Before engine start, the "Battery Charge" voltmeter on the instrument
> panel reads 12.6 Volts.
>
> After starting the engine, the "Battery Charge" voltmeter on the
> instrument panel reads 14.1 Volts.
Normal.
> In flight, the "Battery Charge" voltmeter will increase up to 14.9
> Volts (almost in the red).
Not normal.
> Is 14.9 Volts too high?
Probably but read on.
> Should I try to correct this situation?
> Could the Voltage Regulator be bad, or possibly Alternator putting
> out too much voltage?
First determine that you really are seeing 14.9 volts. Get a known-good voltmeter
and put it on the bus to read the voltage and check the calibration of the
aircraft's voltmeter.
The interesting thing is that I see exactly the same problem in my 1960 PA-24-250
but only when the gear is in-transit. I suspect a connection with too much
voltage drop downstream of the alternator to the gear motor and that the VR is
sampling the bus voltage downstream also. In an attempt to keep the voltage
where it should be at the sense point the VR drives the output of the alternator
too high. I have even had the OV protection relay kick out when the bus is
fully loaded and I dropped the gear. OTOH it could just be a load-dumping event
when the gear completes its cycle.
45 year-old wiring probably is not the best. I suspect that cleaning and repairing
all the old connections would go a long way toward solving the problem.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
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