Today's Message Index:
----------------------
1. 05:41 AM - Mounting Ground Bus (Jack Lockamy)
2. 07:49 AM - conductivity (Gary Casey)
3. 09:22 AM - Z-14 Transient Suppressor (Mark Steitle)
4. 02:18 PM - Light dimmer instruction question. (WHigg1170@aol.com)
5. 03:16 PM - Battery Failure ()
6. 03:41 PM - DIY all-electric AOA (Sigma Eta Aero)
7. 04:52 PM - Re: DIY all-electric AOA (Rob Housman)
8. 07:05 PM - Battery on Engine side of firewall (Ralph E. Capen)
9. 08:04 PM - Re: Failure analysis to plagiarize? (Robert L. Nuckolls, III)
10. 08:07 PM - Re: MFJ-259B (Robert L. Nuckolls, III)
11. 08:20 PM - Re: DIY all-electric AOA (Jerzy Krasinski)
12. 08:26 PM - Re: Light dimmer instruction question. (Robert L. Nuckolls, III)
13. 08:47 PM - Re: Mounting Ground Bus (Robert L. Nuckolls, III)
14. 10:49 PM - AVG / Grisoft antivirus (Rob W M Shipley)
Message 1
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Mounting Ground Bus |
HTML_FONT_COLOR_BLUE, HTML_FONT_FACE_ODD, HTML_MESSAGE
--> AeroElectric-List message posted by: "Jack Lockamy" <jacklockamy@att.net>
Bob,
I have your AeroConnection Book and monitor this list. Lots of great info from
both sources... However, I still am a bit confused about how to mount the Ground
Bus to a metal firewall in an all metal airplane (RV-7A).
Does the ground bus mount DIRECTLY to the firewall or is it mounted on stand-offs?
If it is mounted directly to the firewall, how is running all the ground
wires to local ground connections any different than going to the Ground Bus?
I must be missing something simple here.
Thanks for all your help.
Jack Lockamy
Camarillo, CA
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 |
|
--> AeroElectric-List message posted by: "Gary Casey" <glcasey@adelphia.net>
<<Brass hardware is readily available and a reasonable compromise.
Even so, conductivity is not likely to become an issue in most airplanes
until you step up to 100A plus systems with lots of electric
heat or air conditioning loads that can be high and sustained.
But steel hardware with high electrical loading IS a concern.
The only electrical fire I ever started was the result of
mis-applied steel hardware in the conduction path.
Bob . . .>>
You made me curious so I looked it up - the following are in units of
micro-ohm-cm if I deciphered the table correctly:
Copper wire - 1.7
Aluminum (pure) - 2.8
Brass - 6.21, or about 4 times the resistance of copper
Steel - 15 to 45 with harder (stronger) materials having the higher numbers
A note in Mark's Handbook says bronze alloys can have 25 to 85% of the
conductivity of copper with tensile strengths up to 130,000 psi, just as Bob
said. I was surprised to see how poorly steel conducts electricity. The
resistance of steel is 10 to 30 times that of copper. Aluminum is a poorer
conductor than copper per unit volume, but better per unit weight - hence
the use of aluminum for electrical transmission wires and some aircraft
battery cables.
Gary Casey
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: | Z-14 Transient Suppressor |
--> AeroElectric-List message posted by: Mark Steitle <msteitle@mail.utexas.edu>
Bob,
I'm puzzled and hope you can help clear this up for me. I am following the
Z-14 wiring plan and I see an item which is labeled as a "transient
suppressor", but there is no note, p/n, etc. Can you explain what this
is, and if I need it.
Thanks,
Mark S.
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: | Light dimmer instruction question. |
MIME_LONG_LINE_QP@matronics.com, NO_REAL_NAME@matronics.com
--> AeroElectric-List message posted by: WHigg1170@aol.com
I have a question on the instructions for the Aero Electric 1.5 AMP Light
dimmer. In the instructions there is a note that says (There are to variations
of
the dimmer assembly that use different pin numbers appropriate to the
revision level of your dimmer) What dose this mean? I see the two ways to hook
up the
pins but don't now what one to use or what the revision level is or means.
Thanks for any help.
Bill Higgins
RV-6
Message 5
| 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 |
|
HTML_30_40, HTML_MESSAGE, NO_REAL_NAME
--> AeroElectric-List message posted by: <jimk36@comcast.net>
Bob et al --
I'm presently planning to equip my F1 Rocket with 2 alternators and a single batt.as
per Z-12. My question is with respect to batt failure in flight and possible
negative effect on alternator{s} powering the system.
Over many years with automobiles and airplanes [too many years] I have had numerous
batt failures, usually but not always due to poor maintenance, and alternator
failures. But I have never had a batt failure which, with the engine running,
inhibited the ability of the alternator to power the electrics.
I expect that if engine RPM is less than that needed by the alternator to support
the load, and the batt is discharged, at some point power to the field will
drop below minimum and the lights will go out.
Are there other conditions one should be concerned about?
Jim
Message 6
| 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: | DIY all-electric AOA |
--> AeroElectric-List message posted by: Sigma Eta Aero <sigmatero@yahoo.com>
Anybody know of a schematic for an all electric angle of attack indicator that
uses pressure transducers in the wing to drive a simple colored bar graph?
Thanks!
Joa
---------------------------------
Message 7
| 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: | DIY all-electric AOA |
--> AeroElectric-List message posted by: "Rob Housman" <RobH@hyperion-ef.com>
If you literally mean a schematic for rolling your own AOA I don't have the
answer, but if you want to buy one check out http://www.angleofattack.com/
Best regards,
Rob Housman
Europa XS Tri-Gear A070
Airframe complete
Irvine, CA
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Sigma Eta
Aero
Subject: AeroElectric-List: DIY all-electric AOA
--> AeroElectric-List message posted by: Sigma Eta Aero
<sigmatero@yahoo.com>
Anybody know of a schematic for an all electric angle of attack indicator
that uses pressure transducers in the wing to drive a simple colored bar
graph?
Thanks!
Joa
---------------------------------
Message 8
| 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: | Battery on Engine side of firewall |
--> AeroElectric-List message posted by: "Ralph E. Capen" <recapen@earthlink.net>
Fellow listers,
The RV 7 and 9 crowds (with new recomendations to the 6 guys) are putting
their batteries (Odyssey)forward of the firewall according to the firewall
forward info I'm now getting from Vans with the firewall forward kit.
Are there compelling reasons NOT to do this?
I can think of heat....! Maybe those batteries are immune!?
I'm not too far past this point - is it time to go back and make this so?
Thanks,
Ralph Capen
Already put my grounding block where this new battery box is supposed to
go......
Message 9
| 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: Failure analysis to plagiarize? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 09:29 PM 9/15/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: "Treff, Arthur"
><Arthur.Treff@Smartm.com>
>
>Listers,
>I"m in the process of creating a Failure Effects Mode Analysis to check my
>work on panel/electrical system design for my RV-8. Also, this will be
>used to show the FAA DAR that I know what I'm doing in building an IFR
>capable ship. I have never done this on the job, so I'm trying to teach
>myself. So far, I have pages of statements followed by bullets, which is
>cumbersome, requiring a ton of reading to get to the point. I would
>prefer a graphical format, but I'm not creative enough to design one. Has
>one of you gone thru with something similar, and if so, would you be
>willing to share how your analysis looks with this beginner?
It's easy . . . and usually doesn't take a lot
of paperwork, just some consideration of how
a system works, how much you depend on the system
for comfortable completion of flight and how
you might alter the design or operation of your
airplane to mitigate tense situations. See:
http://216.55.140.222/articles/FMEA.pdf
Bob . . .
Message 10
| 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 |
|
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 06:39 AM 9/16/2003 +0200, you wrote:
>--> AeroElectric-List message posted by: "John F. Herminghaus"
><catignano@tele2.it>
>
>Bob:
>
>Sometime ago you recommended the MFJ-259B SWR analyzer, but according
>the specifications (1.8 to 170 MHZ) it does not cover GPS frequencies.
>What do you suggest?
buy and install good antennas. I've never had an occasion
to wish I could check the characteristics of a Ghz scale
antenna like Xponder and/or GPS . . . usually, if they're
not damaged, they're working fine. For example, if you
whack the transponder antenna while scrubbing guckum off
the airplane's belly and break it off, it's a fair bet
you need a new one. If it's clean, and mechanically secure,
it's unlikely to be the root cause of any system problems.
Of course, there are still feedlines which can be gross-
tested for opens and shorts with an ohmmeter.
Bob . . .
Message 11
| 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: DIY all-electric AOA |
--> AeroElectric-List message posted by: Jerzy Krasinski <krasinski@direcway.com>
I am working on one.
To cut the development time I bought a kit of a vu meter from one of the
surplus companies. They sell it for audio amplifiers. The kit was
provided with a logaritmic driver chip (I think it was LM3915) which I
replaced with a linear version (LM3914 ?).I replaced the sensitivity
control resistor in the vu meter with a short to get maximum
sensitivity. The input voltage to get full range is now a little over
one volt. I replaced the current control resistor with a photoresistor
to get automatic brightness control. That took some time. All the
photoresistors I had were of a too small resistance and they pumped too
much current into LEDs producing too much brightness. Finally, throwing
away a broken light activated night lamp I found a tiny photoresistor
inside, and that one works ok. A bigg problem was to find a set of
different color LEDs that would produce similar brightness. Turns out
that it is difficult to get yellow LEDs with brightness matching very
bright greens and reds. I also added an operational amplifier forming
noninverting amplifier with adjustable gain, just in case if I needed
more sensitivity. Probably it will not be needed, but it would be a big
project later, and it was easy to make now.
Anyway, I have a display which will display whatever input voltage.
Initially, I plan to install a vane on a small low friction
potentiometer and attach it somewhere to the wing tip or to the main
gear fairing. That seems to be simpler to get working.
I have a differential pressure sensor, 0-5" water max differential
pressure range, with max common mode pressure of 10 psi. It requires 5V
supply and at full differential pressure of 5" of water it makes ~4V
output. It is Ares series model GA100-005WD. I think they are made by
Schaevitz Sensors. My plan is to install it after I get the plane
flying. But I am sure that it will take some time to find proper probe
positions to get it working right.
I finished with the electronics which for sure will require some
adjustments, but my plane doesn't fly yet, so who knows how and if it
will work.
Jerzy
Sigma Eta Aero wrote:
>--> AeroElectric-List message posted by: Sigma Eta Aero <sigmatero@yahoo.com>
>
>
>Anybody know of a schematic for an all electric angle of attack indicator that
uses pressure transducers in the wing to drive a simple colored bar graph?
>
>Thanks!
>
>Joa
>
>
>---------------------------------
>
>
>
>
Message 12
| 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: Light dimmer instruction question. |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 05:17 PM 9/16/2003 -0400, you wrote:
>--> AeroElectric-List message posted by: WHigg1170@aol.com
>
>I have a question on the instructions for the Aero Electric 1.5 AMP Light
>dimmer. In the instructions there is a note that says (There are to
>variations of
>the dimmer assembly that use different pin numbers appropriate to the
>revision level of your dimmer) What dose this mean? I see the two ways to
>hook up the
>pins but don't now what one to use or what the revision level is or means.
>Thanks for any help.
If you bought your dimmer recently, it's the later "A" revision.
Also, if they're marking them as I suggested, the part number
on the heatsink should be DIM15-14A . . .
Bob . . .
Message 13
| 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: Mounting Ground Bus |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
At 05:33 AM 9/16/2003 -0700, you wrote:
>--> AeroElectric-List message posted by: "Jack Lockamy" <jacklockamy@att.net>
>
>Bob,
>
>I have your AeroConnection Book and monitor this list. Lots of great info
>from both sources... However, I still am a bit confused about how to
>mount the Ground Bus to a metal firewall in an all metal airplane (RV-7A).
>
>Does the ground bus mount DIRECTLY to the firewall or is it mounted on
>stand-offs? If it is mounted directly to the firewall, how is running all
>the ground wires to local ground connections any different than going to
>the Ground Bus? I must be missing something simple here.
It mounts right on the firewall. Check out the chapter on noise
and in particular, "ground loops". It's important that all panel
and/or engine compartment stuff come to the single point ground
on firewall. Remove any jumpers that might exist across engine
mount isolators. Ground crankcase to firewall bus stud with
beefy jumper strap. Take battery (-) to ground stud on firewall.
There are a few non-victim/non-antagonist components that
can ground locally. Lamps in wings and tail, pitot heat, & strobe
power supply.
Bob . . .
Message 14
| 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 |
|
"RV-List Digest Server" <rv-list-digest@matronics.com>
| Subject: | AVG / Grisoft antivirus |
HTML_MESSAGE, OFFER
--> AeroElectric-List message posted by: "Rob W M Shipley" <rob@robsglass.com>
NOT RV RELATED
I'm posting this to the list since I'm aware that many listers use this antivirus
software.
I've been using their free offering for a while now - in fact since turned on to
it by another lister. In the last week I've been making some changes with my
ISP and some server problems have arisen.
I am now unable to receive my scheduled updates and after a complete reinstall
on one computer I cannot get a response from AVG to the request for a password
to activate the new installation.
I would be very grateful if anyone can help me figure out if there is a problem
with AVG or my ISP's server.
I really would like to be able to continue using this program but since there is
no reply to the activation code request I'm wondering if they have discontinued
the free antivirus service.
Any help appreciated.
Fly safe
Rob
Rob W M Shipley
RV9A N919RV (res) Fuselage
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! --
|