Today's Message Index:
----------------------
1. 04:38 AM - cell phone rechargers (bob noffs)
2. 05:58 AM - Re: cell phone rechargers (Mike Welch)
3. 06:47 AM - Re: AOA indicator (user9253)
4. 06:53 AM - HF hyd Crimper on sale (Ron Quillin)
5. 06:53 AM - Re: cell phone rechargers (Jared Yates)
6. 07:14 AM - Re: cell phone rechargers (Mike Welch)
7. 07:31 AM - Heated Pitot Tubes - Some first hand history (Robert L. Nuckolls, III)
8. 07:44 AM - Re: cell phone rechargers (Robert L. Nuckolls, III)
9. 07:48 AM - Re: Re: No click when pushing PTT (Dj Merrill)
10. 07:53 AM - AOA: Re: AOA indicator (Ed Anderson)
11. 08:37 AM - Re: cell phone rechargers (Carlos Trigo)
12. 09:30 AM - Re: AOA: Re: AOA indicator (Robert L. Nuckolls, III)
13. 09:36 AM - Re: Re: AOA indicator (Robert L. Nuckolls, III)
14. 11:16 AM - follow up shielded wire/hub question (cardinalnsb@aol.com)
15. 02:29 PM - Re: Re: AOA indicator (rayj)
16. 06:01 PM - Re: cell phone rechargers (bob noffs)
17. 06:19 PM - Re: Re: AOA indicator (Robert L. Nuckolls, III)
18. 10:04 PM - Re: AOA indicator (royalina)
19. 10:04 PM - Re: No click when pushing PTT (royalina)
20. 10:04 PM - Re: Battery disconnect switch (royalina)
Message 1
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| Subject: | cell phone rechargers |
bob,
i put together a $15 kit to allow the light of a cell phone to turn on a
relay which i use to activate a 20 amp connector which someday will preheat
my engine. with a $15 kit there are no codes or protection from false starts
so to protect from power out and back on which activates the display on the
phone i was wondering about using a 6 volt battery instead of the120 volt
ac phone charger. the chargers are rated 4.5-9.5 volts. my question is
.......do cell phones have internal means to regulate the current flow to
charge their battery or will wiring it to a 6 volt battery for charging fry
it? it does take 2 calls to activate it so that lessens the possibility.
thanks for the time on this ''off topic'' issue
bob noffs
Message 2
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| Subject: | cell phone rechargers |
Bob Noffs=2C
My apologies for stepping into your question to Bob N=2C but I have exper
ienced this.
I had two different brand cell phones=2C yet they both could accept either
one's wall
charger plug. However=2C the wall charger's output voltages were NOT the s
ame voltage.
I can't recall exactly what the voltages were=2C but it was LESS than 1/2 v
olt.
I figured I'd take a gamble=2C and plug the higher voltage wall charger i
nto the
lower voltage cell phone. Poof! The phone went dead=2C D-E-D=2C dead. It
wasn't
just the battery=2C either=2C because I plugged it in the correct charger
=2C but that didn't
make a difference.
You could see some kind of proof that the phone was on=2C like the screen
was lit=2C but
blank=2C or something like that=2C but no amount of fiddling with it ever s
howed it was
ever going to work again. Less than 1/2 volt too much fried it!!
So=2C in answering your question=2C in my experience=2C no=2C a cell phon
e can not take
virtually any higher charge than the wall charger rating.
Mike Welch
Subject: AeroElectric-List: cell phone rechargers
From: icubob@gmail.com
bob=2C
i put together a $15 kit to allow the light of a cell phone to turn on a
relay which i use to activate a 20 amp connector which someday will preheat
my engine. with a $15 kit there are no codes or protection from false star
ts so to protect from power out and back on which activates the display on
the phone i was wondering about using a 6 volt battery instead of the120 vo
lt ac phone charger. the chargers are rated 4.5-9.5 volts. my question is .
......do cell phones have internal means to regulate the current flow to ch
arge their battery or will wiring it to a 6 volt battery for charging fry i
t? it does take 2 calls to activate it so that lessens the possibility. th
anks for the time on this ''off topic'' issue
bob noffs
Message 3
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| Subject: | Re: AOA indicator |
Bob,
I did a search of past EAA articles and found the following pertaining to AOA:
Better Way to Fly - May 1998
Carrier Pilots' Secret - July 1999
Test Pilot: Angle of Attack - April 2001
Test Pilot: Angle of attack and lift/drag - May 2001
Test Pilot: Angle of Attack - November 2003
Shop Talk: Angle of Attack Indicator - December 2008
I could not find anything in 2005 about AOA. The December 2008 article by Dave
Barker might be the one that you are looking for. It describes how to build
the AOA sensor using a hall effect transducer and LED bar graph display.
Here is a link to the December 2008 EAA article: http://www.oshkosh365.org/saarchive/eaa_articles/2008_12_21.pdf
Below are links to the author's website. Dave Barker's pdf gives more detailed
construction details than the EAA magazine article.
http://www.barkeraircraft.com/files/AOA_rDisplay.pdf
http://www.barkeraircraft.com/AOA_kit.html
Although Dave Barker no longer sells AOA kits, he still has some circuit boards
available. There is a link to his email address on his website.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331206#331206
Message 4
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| Subject: | HF hyd Crimper on sale |
The hydraulic HF crimper 66150 of recent discussion is on sale for $45 thru
the 19th with attached coupon, $59 without.
http://www.harborfreight.com/hydraulic-wire-crimping-tool-66150.html?___SID=U
Ron Q.
Message 5
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| Subject: | Re: cell phone rechargers |
How about a DC powered cell-phone charger?
You can find a cheap automotive charger for just about any cell phone on
ebay. I've been ordering them from china directly, usually for a few
dollars including shipping. You should also be able to find a cheap
alligator clip lead with a female SAE 12v jack on one end. Could you clip
those alligator leads onto your airplane's battery, which is already
connected to a maintaining charger like the Schumaker 1526? Then you are
using AC power for the long term, but DC power for the short term. In this
case, "short term" would probably still be a really long time. When it's
time to fly, just unhook your alligator clips and charger, and leave them at
the hangar. If your phone system is located some distance from the
airplane, you could use this same strategy with a stand-alone 12v battery
and an AC or solar battery tender. This would be a great use for a
retired odyssey battery or something like that. If you keep a lawn tractor
or any other GSE in the hangar, you could use one of those onboard batteries
instead.
On Wed, Feb 16, 2011 at 8:50 AM, Mike Welch <mdnanwelch7@hotmail.com> wrote:
> Bob Noffs,
>
> My apologies for stepping into your question to Bob N, but I have
> experienced this.
> I had two different brand cell phones, yet they both could accept either
> one's wall
> charger plug. However, the wall charger's output voltages were NOT the
> same voltage.
> I can't recall exactly what the voltages were, but it was LESS than 1/2
> volt.
>
> I figured I'd take a gamble, and plug the higher voltage wall charger
> into the
> lower voltage cell phone. Poof! The phone went dead, D-E-D, dead. It
> wasn't
> just the battery, either, because I plugged it in the correct charger, but
> that didn't
> make a difference.
> You could see some kind of proof that the phone was on, like the screen
> was lit, but
> blank, or something like that, but no amount of fiddling with it ever
> showed it was
> ever going to work again. Less than 1/2 volt too much fried it!!
>
> So, in answering your question, in my experience, no, a cell phone can
> not take
> virtually any higher charge than the wall charger rating.
>
> Mike Welch
>
>
> ------------------------------
> Date: Wed, 16 Feb 2011 06:26:51 -0600
> Subject: AeroElectric-List: cell phone rechargers
> From: icubob@gmail.com
> To: aeroelectric-list@matronics.com
>
> bob,
> i put together a $15 kit to allow the light of a cell phone to turn on a
> relay which i use to activate a 20 amp connector which someday will preheat
> my engine. with a $15 kit there are no codes or protection from false starts
> so to protect from power out and back on which activates the display on the
> phone i was wondering about using a 6 volt battery instead of the120 volt
> ac phone charger. the chargers are rated 4.5-9.5 volts. my question is
> .......do cell phones have internal means to regulate the current flow to
> charge their battery or will wiring it to a 6 volt battery for charging fry
> it? it does take 2 calls to activate it so that lessens the possibility.
> thanks for the time on this ''off topic'' issue
> bob noffs
>
> *
>
> -List" target=_blank>http://www.matronics.com/Navigator?AeroElectric-List
> ttp://forums.matronics.com
> =_blank>http://www.matronics.com/contribution
> *
>
> *
>
> *
>
>
Message 6
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| Subject: | Re: cell phone rechargers |
Jared,
Although I failed to suggest that, what you suggested is what I woul do.
If a guy got a small 12V battery, and one of those 12V cigarette lighter
recepticles, and used the 12V cell phone chargers, he'd be fine.
Plus, he could get one of the battery tenders from Harbor Freight that
keeps his 12 V battery always topped off. Battery tender, small 12V battery,
and the car charger would do it!!
Mike Welch
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331211#331211
Message 7
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| Subject: | Heated Pitot Tubes - Some first hand history |
At 02:09 AM 2/16/2011, you wrote:
Bob
I just noticed your comments about loss of IAS on both sides of the
Beechjet. l attended 2 of your Seminars and I know we talked about
both having worked for Cessna. When I left Cessna as a Flight Test
Engineer in 1968.
I'd forgotten that conversation. Were you working at the Pawnee
or Wallace plant? I was a tech writer at Cessna from about 1964 to
1969 . . . just a few months over 5 years.
I went to work for the Army Aviation Systems Cmd in St Louis as a
Dept of Army Civilian Senior Aeronautical Engineer and was there for
28+ years. Most of my time there was spent with the Army's Fixed Wing
Electronic Intelligence Gathering Aircraft. In the later years I was
the Army Technical Manager for 7 different versions of the RC-12
(Super Kingair 200), the last 4 versions comprised of 36 aircraft
with 1200 SHP engines and Gross Weights in the 16,000 to 16,500 lb
range. In the early '90s, we took the RC-12N configuration which had
the largest antenna array to Duluth, Mn in January for natural icing tests.
The Army test crew from EAFB had a specially instrumented U-21 to
search for icing conditions and would then call out the RC-12N. I
rode with the Army test crew on flights 2 and 3 as a FTE/ Observer.
On flight 2, we were in a low stratus layer around 3000 ft MSL, 140
KTS, about 45% cruise power. At 50 minutes we has collected 5 1/2
inches of ice with all of the deice going, at 90% cruise power for
the same air speed and had just lost the right pitot airspeed. About
3 minutes later we lost the left pitot airspeed. About 2 minutes
later, we climbed out of the low stratus layer so the U-21 could get
photos of the ice buildups. Fortunately the U-21 was able to get a
picture of the right pitot which showed that ice had grown forward on
the unheated pitot mast and then curved downward to block the pitot
inlet, at no time actually touching the pitot tube itself. Before the
U-21 could move to the left side, the left mast had lost enough ice
that the left airspeed had come back and a few minutes later the
right airspeed was back.
Wow! That would be some interesting pictures to have
in the library. Talk about tweaking the tail of the
tiger. I have 2 hours of dual in a King Air. I had
the electrical/avionics group at Lear for the GP-180
program and Collins came down in their company demonstrator
to show me some new features of their autopilot system.
The demonstrator pilot was also an instructor and
he invited me to take the left seat.
One of the most profound demonstrations of the
King Air (after we BACKED out of a parking
space) was the autopilot's ability to quickly
manage a loss of engine event. Climbing out we
were showing something like 2700 fpm and he
pulled one throttle to zero thrust. The airplane
barely yawed and the only thing that happened
was that noise level dropped and rate of climb
decreased to 1500 fpm. Now THAT'S what I call
single-engine performance.
If there was ever an airplane capable of staying
in the air under the most adverse of conditions,
it would have to be the twin turboprops. I had to
run home after that flight to get my log book. Didn't
want to miss getting the experience recorded. I also
have 2 hours of dual in a Baron and got a chance
to play with single-engine performance of that
airplane. The differences are profound.
Beech attempted to get some heat in the mast , but abbreviated tests
the following winter showed that it was insufficient. Bob, I don't
know whether the Beechjet used the same pitot units or a similar
design, but that was our findings on the Model 200.
Back in that era, pitot tubes had a LOT in common
including the ways they distributed heat. While working
the BE400 pitot heat issues in 2002 I discovered that the
heaters are long, tubular devices that snake
from each connector pin through various locations
and designed to create localized hot-spots. These
are not linear, uniform toaster heaters but specifically
tailored to distribute heat based on tests in icing tunnels.
In this case, a percentage of total heat was dumped
into the mast.
Further, the inside of a pitot tube can feature
a labyrinth of passages, chambers and 'melting
pots' tailored to stand off the various effects
of icing. See:
http://aeroelectric.com/Pictures/Pitot_Tube/
Another interesting feature of pitot tube
performance is illustrated by the plotted
flight test data (gathered with my po' boy's
laptop based instrumentation system). At 40KFt
-30C RAT and over 200Kts IAS, temperatures
at some locations on the tube were well over
100C. Now would like to believe there's no way
that icing could be a factor in the loss of
IAS . . . yeah . . . right.
After the studies were completed on the 400 I think
they re-distributed some heat and moved some drain
holes. Unfortunately, they could not increase total heat
without impacting the DC load studies for the
whole airplane. We had to live within the existing
power budget in spite of the fact that for 99.9%
of all operations in ice, there was power to burn.
Any heated pitot tube installation certified in
the last 30+ years is probably blessed with a heated
pitot tube that is "similar" but not identical
to other installations. Of course, ANY heated
pitot tube adapted to a single engine light
airplane can be expected to perform pretty much
as advertised. I don't think there are 14v
airplanes certified for flight in to known ice
that would also have finely tuned pitot tube
heater systems. Virtually all supper-whizzy
heated tubes will be off a pretty heavy duty
foul-weather capable airplane and will have
a 28v system.
Thanks for sharing your experience with us.
Bob . . .
Message 8
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| Subject: | cell phone rechargers |
At 08:50 AM 2/16/2011, you wrote:
>Bob Noffs,
>
> My apologies for stepping into your question to Bob N, but I have
> experienced this.
>I had two different brand cell phones, yet they both could accept
>either one's wall
>charger plug.
<snip>
>
> So, in answering your question, in my experience, no, a cell
> phone can not take
>virtually any higher charge than the wall charger rating.
It's unfortunate that there's so little standardization
for power supplies . . . especially for cell phones. We've
owned a variety of brands and models in the family and
cursed the need for separately tailored wall and mobile
chargers for each phone.
There appears to be a trend toward "USB Port" standardization
which would be 5.0 +/- 0.2 volts DC power. If your phone
is indeed a USB compatible device, then you'll want to
provide a tightly regulated power source. One easy way
to get the right power AND the right connector is to
acquire an IGo universal adapter.
http://tinyurl.com/4un3rdk
and combine it with the appropriate custom tip that
mates with your phone. The adapter has it's own
switchmode power supply that is set to the right
output voltage when the right tip is installed.
The adapter will need to be powered from 12v or
so. A small SLVA battery and BatteryTender would
be a good choice.
The nice thing about this arrangement is that
you can change phones at any time in the future
by simply swapping the power adapter tip.
I've read some descriptions of similar remote
control systems. One of the most interesting
used an audio detection system. The phone was
set to 'silent' except for a custom ring-tone
that activated by your controlling phone
number only.
Bob . . .
Message 9
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| Subject: | Re: No click when pushing PTT |
On 02/15/2011 11:32 PM, N777TY wrote:
> This radio allows me perfectly normal "5 by 5" communication with anyone on frequency..
there have never been any issues with clarity nor strength of normal
voice transmission.. It just doesn't click... that's all.
I've been trying to figure out what this "click" is that you indicate
happens on COM1. I don't remember ever getting a click on the radios
I've used. Even new solid state handhelds will trigger the runway
lighting, and they (or at least mine) doesn't make any noise at all when
pressing the transmit button, and I do not remember an audible click
being heard on a receiving radio when transmitting on the handheld.
I have no real data to back this statement up, but my gut tells me that
the "click" or lack of is simply a red herring and has nothing to do
with being able to activate the runway lights.
Just a passing thought, have you tried to activate the runway lights
with this radio at a different airport? Just wondering if there might
be something a bit off with the receiver at your local airport that
might be causing the issue.
-Dj
--
Dj Merrill - N1JOV
Glastar Sportsman 2+2 Builder #7118 N421DJ - http://deej.net/sportsman/
Please use Netiquette Guidelines http://tools.ietf.org/html/rfc1855
Kindly TRIM your email replies and post AFTER the relevant text
Message 10
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| Subject: | Re: AOA indicator |
Attached is an AOA approach by by Jim Mantyla of Barrie Ont for the AirSoob
list.
I borrowed the idea for the AOA "pitot tube" with the angled holes. But,
instead of an analog pressure gauge calibrated for "Reserve Lift" - I put a
pressure sensor next to the probe.
I then processed and compared the dynamic pressure component provided by
each tube of the probe, I used a microprocessor to do this and provide a
display of both the calculated AOA value and a visual (graphical) indication
of the angle of attack with alarms that could be set.
I tested it on the bench with air flow and by varying the angle of attack
between wind flow and probe, it would indeed respond as expected. I had
initially intended to offer the unit for sale, but later decided that it
would probably not be economically viable as other units were avaliable and
the market for AOA was uncertain. I also question how many folks would want
to hang another "Pilot probe" under the wing.
It was a fun and educational project and I still have it for some future
time when things are slower and I find the time to hang it under the wing
and see how it works in the real world.
Too little time and too many projects {:>)
Ed
Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com
--------------------------------------------------
From: "user9253" <fran4sew@banyanol.com>
Sent: Wednesday, February 16, 2011 9:44 AM
Subject: AeroElectric-List: Re: AOA indicator
> <fran4sew@banyanol.com>
>
> Bob,
> I did a search of past EAA articles and found the following pertaining to
> AOA:
> Better Way to Fly - May 1998
> Carrier Pilots' Secret - July 1999
> Test Pilot: Angle of Attack - April 2001
> Test Pilot: Angle of attack and lift/drag - May 2001
> Test Pilot: Angle of Attack - November 2003
> Shop Talk: Angle of Attack Indicator - December 2008
> I could not find anything in 2005 about AOA. The December 2008 article by
> Dave Barker might be the one that you are looking for. It describes how
> to build the AOA sensor using a hall effect transducer and LED bar graph
> display.
> Here is a link to the December 2008 EAA article:
> http://www.oshkosh365.org/saarchive/eaa_articles/2008_12_21.pdf
> Below are links to the author's website. Dave Barker's pdf gives more
> detailed construction details than the EAA magazine article.
> http://www.barkeraircraft.com/files/AOA_rDisplay.pdf
> http://www.barkeraircraft.com/AOA_kit.html
> Although Dave Barker no longer sells AOA kits, he still has some circuit
> boards available. There is a link to his email address on his website.
> Joe
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=331206#331206
>
>
>
Message 11
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| Subject: | cell phone rechargers |
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: quarta-feira, 16 de Fevereiro de 2011 14:38
Subject: RE: AeroElectric-List: cell phone rechargers
At 08:50 AM 2/16/2011, you wrote:
It's unfortunate that there's so little standardization
for power supplies . . . especially for cell phones.
Recently I saw in some TV news that the great majority of world cell phone
manufacturers (including Motorola, NOKIA, Siemens, Samsung - I can't
remember if iPhone and Blackberry were in) had reached an agreement exactly
to standardize all cell phone chargers.
Let's hope they do it quickly
Carlos
Message 12
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| Subject: | Re: AOA indicator |
At 10:43 AM 2/16/2011, you wrote:
>Attached is an AOA approach by by Jim Mantyla of Barrie Ont for the
>AirSoob list.
>
>I borrowed the idea for the AOA "pitot tube" with the angled
>holes. But, instead of an analog pressure gauge calibrated for
>"Reserve Lift" - I put a pressure sensor next to the probe.
Great minds think alike . . . ;-)
I fiddled with an identical configuration about ten
years ago. Looked at a molded two-port AOA mast with
electronics built right into the base of the mast
and driving a small analog instrument. Mount mast,
hook up 14v, install indicator and calibrate.
>Market for AOA was uncertain. I also question how many folks would
>want to hang another "Pilot probe" under the wing.
>
>It was a fun and educational project and I still have it for some
>future time when things are slower and I find the time to hang it
>under the wing and see how it works in the real world.
>
>Too little time and too many projects {:>)
You got that right. Never got a chance to fly the
poc item but I did "fly it" on the roof of my
car. But aside from packaging, I had nothing
particularly unique from other products on the
market . . . and the "lift reserve" approach with
mast, two tubes and a Magnehelic gage was pretty
simple . . . tough competition.
Bob . . .
Message 13
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| Subject: | Re: AOA indicator |
At 09:44 AM 2/16/2011, you wrote:
>
>Bob,
>I did a search of past EAA articles and found the following pertaining to AOA:
<snip> thanks to all who responded to my query about S.A.
articles. I now have several. It's interesting/useful to see
what kinds of things have been published for the OBAM aviation
community. I've added all your contributions to my library.
Bob . . .
Message 14
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| Subject: | follow up shielded wire/hub question |
My first question needed to be more specific. My audio panel installation
manual shows that the shielded wires are "open" (shield not grounded) at
the end where the wires connect to the radio, and the shields are all gro
unded together at the audio panel.
If I use a "hub" system, where all avionics go in and then out of the hub,
do I keep each shield on a separate pin going in and out of the hub, or
do I ground all the shields together going into the hub and then start a
set of new shielded wires comng out of he hub (open coming out of the hub
) and tie all the shields to ground at the audio panel?
Thanks for the help, Skip
-----Original Message-----
From: AeroElectric-List Digest Server <aeroelectric-list@matronics.com>
Sent: Tue, Feb 15, 2011 11:56 pm
Subject: AeroElectric-List Digest: 21 Msgs - 02/15/11
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AeroElectric-List Digest Archive
---
Total Messages Posted Tue 02/15/11: 21
----------------------------------------------------------
oday's Message Index:
---------------------
1. 06:03 AM - Re: Re: No click when pushing PTT (Robert L. Nuckolls,
III)
2. 06:08 AM - Re: Re: No click when pushing PTT (Noel Loveys)
3. 06:10 AM - Re: Re: No click when pushing PTT (Robert L. Nuckolls,
III)
4. 06:13 AM - Re: Re: 2nd radio (Robert L. Nuckolls, III)
5. 06:35 AM - Low Ohms Adapters (Robert L. Nuckolls, III)
6. 06:52 AM - Re: Re: No click when pushing PTT (Robert L. Nuckolls,
III)
7. 07:11 AM - Re: Re: No click when pushing PTT (Etienne Phillips)
8. 07:51 AM - Re: Re: No click when pushing PTT (Bob McCallum)
9. 08:19 AM - Re: Re: No click when pushing PTT (Robert L. Nuckolls,
III)
10. 08:19 AM - Re: Re: No click when pushing PTT (Robert L. Nuckolls,
III)
11. 12:02 PM - Shielded wire use with "wiring hubs" (CardinalNSB@aol.c
om)
12. 12:19 PM - Re: Re: No click when pushing PTT (Noel Loveys)
13. 12:40 PM - Re: Re: No click when pushing PTT (Noel Loveys)
14. 01:01 PM - Re: Re: No click when pushing PTT (Noel Loveys)
15. 02:19 PM - Re: Permanent Magnet Alternators - Over Voltage Protecti
on
markcs)
16. 02:55 PM - Re: AeroElectric-List Digest: 24 Msgs - 02/14/11
EMAproducts@aol.com)
17. 04:31 PM - Re: Shielded wire use with "wiring hubs" (Robert L.
uckolls, III)
18. 04:33 PM - Re: AOA indicator (Robert L. Nuckolls, III)
19. 08:36 PM - Re: No click when pushing PTT (N777TY)
20. 10:58 PM - New Stereo Audio Mixer Products (Vern Little)
21. 11:14 PM - Re: AOA (Dean Van Winkle)
_______________________________ Message 1 ______________________________
_______
ime: 06:03:24 AM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: Re: AeroElectric-List: Re: No click when pushing PTT
t 08:58 PM 2/14/2011, you wrote:
Yes, the radio works fine otherwise (as in, it transmits
fine). COM1 produces the click (hence I can turn on the runway
lights). COM2 doesn't do that. It's not audible, and consequently
lights don't come on..
I can hear the click on COM1 (and as a result, lights can be turned
on, for example)..
When you say 'transmits fine' do I presume that
you can communicate with some distant facility?
If on the ground, can you talk to say a distant
aircraft and the pilot reports strong signal on
either radio?
Suggest you get a rough reading on power output.
You can do this with the most rudimentary of
SWR meters if you don't have access to a real
wattmeter. Use the meter to check the #1 system
and set the device for a full scale, forward
reading on #1 then move it to #2 without changing
the calibration.
Talking to another airplane in the hangar or
to a local hand held might appear to be just
fine when in fact, transmitted power output is
a tiny fraction of what it should be.
Bob . . .
_______________________________ Message 2 ______________________________
_______
ime: 06:08:29 AM PST US
rom: "Noel Loveys" <noelloveys@yahoo.ca>
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
would expect the first thing to do is to verify your radio is not
ransmitting... If you have another radio close by you can test the
ransmitter is operating. An old trick we used to do with taxicabs years
go was to have someone hold a fluorescent tube (tube only completely
nplugged) close to the transmitting antenna and key the mic. If the tube
ights up the transmitter is active. Of course you can also see if you are
utting out any power by inserting an SWR meter in the antenna feed line.
n this case where you are only looking for the presence of power the
heapest of SWR meters will suffice.
As Bob said, gone are the days when there were mechanical relays happily
hattering open and closed with every transmission.
Noel
-----Original Message-----
rom: owner-aeroelectric-list-server@matronics.com
mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of N777TY
ent: February 14, 2011 9:33 PM
ubject: AeroElectric-List: Re: No click when pushing PTT
es, I'm expecting a click.. Considering that the other one which is same
echnology (ie, not a case of old vs. new) I'd think the expectation is
easonable :) Don't remember last time I ran into this situation in any
lane ... so what I'm experiencing on COM2 is not typical.. Looking for
deas what to look at..
--------
V-7A
777TY
ead this topic online here:
http://forums.matronics.com/viewtopic.php?p=331092#331092
_______________________________ Message 3 ______________________________
_______
ime: 06:10:18 AM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: Re: AeroElectric-List: Re: No click when pushing PTT
>I would expect the light control radio to trigger on just the
carrier, but for troubleshooting purposes you might try synthesizing
a click verbally while holding the xmit button for each trigger, &
see if the light control radio would respond to that, assuming that
it really needs to see audio on the carrier.
I'd also ask the control radio's mfgr about whether it just listens
for carrier or not.
If the lighting control system needs audio, it would
be a published feature. Some of the early lighting
control systems were jury-rigged onto the facility's
unicom radio. It was a circuit that needed to see
a sweeping frequency tone that pilots were expected
to generate by whistling.
I haven't seen one of those in service in 30 years.
They're all carrier operated now and generally have
their own dedicated receiver.
I would certainly resolve the power output question
first.
Bob . . .
_______________________________ Message 4 ______________________________
_______
ime: 06:13:17 AM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: Re: AeroElectric-List: Re: 2nd radio
t 12:24 AM 2/15/2011, you wrote:
Hi Jim
If it is possible to share an aerial, do you want to? It would be a
single point of failure for both radios... Every time I've has an
issue with my radio, it's been an antenna problem (about 4 times in
12 years). Having an independent radio is more useful to me as a
backup than a convenience, and so would require an independent
aerial. But that's me!
Excellent point. Antenna duplexers for transceivers
are not cheap. Two antennas are certainly the least
expensive and most reliable configuration. You don't
need an audio panel but probably an audio isolation
amplifier as described in the 'Connection's audio
chapter.
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z16M.pdf
Bob . . .
_______________________________ Message 5 ______________________________
_______
ime: 06:35:49 AM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: AeroElectric-List: Low Ohms Adapters
was able to finish the batch before I had
o leave M.L. on important matters last Saturday.
ad a Valentine's day appointment with my grandkids
nd later my wife!
I've been in Lindsborg the last few days and
ill be back in the shop this afternoon. All
ow ohms adapters on order will go out first
lass mail this afternoon.
I've not finished the official instruction sheet
ut there's probably enough info in these photos
http://www.aeroelectric.com/Catalog/AEC/9008/
to noodle out how the critter is used. I'll announce
ublication of the official instruction sheet
s soon as it's posted.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
_______________________________ Message 6 ______________________________
_______
ime: 06:52:23 AM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
At 08:06 AM 2/15/2011, you wrote:
I would expect the first thing to do is to verify your radio is not
transmitting... If you have another radio close by you can test the
transmitter is operating. An old trick we used to do with taxicabs years
ago was to have someone hold a fluorescent tube (tube only completely
unplugged) close to the transmitting antenna and key the mic. If the tube
lights up the transmitter is active.
Yeah, that was the primary reason for keeping the
little NE-2 or NE-51, neon bulbs around.
Emacs!
They were handy for 'sniffing' strong RF either
within a transmitter or out on the antenna. Since
then transmitters have morphed to low-voltage, high-
current architectures. The lamps won't sniff within the
circuitry but will still light up when held in close
proximity to the tip of a 1/4-wave antenna.
Haven't tried it but I suspect it will still be
limited to getting excited at 5 watts or more.
One is looking for an RF field on the order of
75 volts or more to capacitively excite these
lamps into visible activity.
The very first transmitter I built
http://tinyurl.com/4hwa2da
had an NE-2 permanently attached to the hot side
of the tank coil and could be used to tune the
transmitter. Can anyone spot a risk-issue in
this as-published diagram?
Bob . . .
________________________________ Message 7 _____________________________
________
ime: 07:11:16 AM PST US
ubject: Re: AeroElectric-List: Re: No click when pushing PTT
rom: Etienne Phillips <etienne.phillips@gmail.com>
I'll have a stab at it - when the switch is open, the chassis sits at line
oltage?
On 15 February 2011 16:49, Robert L. Nuckolls, III <
uckolls.bob@aeroelectric.com> wrote:
an anyone spot a risk-issue in
> this as-published diagram?
Bob . . .
________________________________ Message 8 _____________________________
________
ime: 07:51:11 AM PST US
rom: Bob McCallum <robert.mccallum2@sympatico.ca>
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
1 The chassis is directly connected to the line.
2 the switch is in what is hopefully the ground side of the line.
3 It's probably old enough that the line plug is not polarized and the cha
sis may be attached to the "hot" side of the line.
More than one person has been electrocuted with such a layout.
Bob McC
rom: nuckolls.bob@aeroelectric.com
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
At 08:06 AM 2/15/2011=2C you wrote:
>
I would expect the first thing to do is to verify your radio is not
ransmitting... If you have another radio close by you can test the
ransmitter is operating. An old trick we used to do with taxicabs years
go was to have someone hold a fluorescent tube (tube only completely
nplugged) close to the transmitting antenna and key the mic. If the tube
ights up the transmitter is active.
Yeah=2C that was the primary reason for keeping the
little NE-2 or NE-51=2C neon bulbs around.
They were handy for 'sniffing' strong RF either
within a transmitter or out on the antenna. Since
then transmitters have morphed to low-voltage=2C high-
current architectures. The lamps won't sniff within the
circuitry but will still light up when held in close
proximity to the tip of a 1/4-wave antenna.
Haven't tried it but I suspect it will still be
limited to getting excited at 5 watts or more.
One is looking for an RF field on the order of
75 volts or more to capacitively excite these
lamps into visible activity.
The very first transmitter I built
http://tinyurl.com/4hwa2da
had an NE-2 permanently attached to the hot side
of the tank coil and could be used to tune the
transmitter. Can anyone spot a risk-issue in
this as-published diagram?
Bob . . .
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SiilV/jP+u5nU6fP9D/2Q
________________________________ Message 9 _____________________________
________
ime: 08:19:50 AM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
t 09:16 AM 2/15/2011, you wrote:
#1 The chassis is directly connected to the line.
#2 the switch is in what is hopefully the ground side of the line.
#3 It's probably old enough that the line plug is not polarized and
the chassis may be attached to the "hot" side of the line.
More than one person has been electrocuted with such a layout.
Yup . . . you're tied for first place.
Bob . . .
_______________________________ Message 10 _____________________________
_______
ime: 08:19:50 AM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: Re: AeroElectric-List: Re: No click when pushing PTT
t 09:04 AM 2/15/2011, you wrote:
I'll have a stab at it - when the switch is open, the chassis sits
at line voltage?
Right on! I'd built a number of transformer-less
circuits where injudicious wiring and positioning
of switches could put a chassis at above ground
potentials.
Since all ham gear was expected to be well
grounded for reasons of antenna performance,
it made sense to use the SAME ground as the
power return for the device. Make the line-cord
a one-wire lead that was switched. If the
gizmo didn't power up, reverse the plug. But
in no case was the properly grounded system at
risk for presenting a shock hazard.
So called AC/DC radios popular at the time
were always housed in a wood or plastic case.
Quite often, the line-connected 'ground' within
the appliance was floating from the chassis.
When launching a line-powered, transformer-less
DIY project, it was good to understand such
things.
Good eye!
Bob . . .
_______________________________ Message 11 _____________________________
_______
ime: 12:02:32 PM PST US
rom: CardinalNSB@aol.com
ubject: AeroElectric-List: Shielded wire use with "wiring hubs"
hat is the appropriate way to handle the shield part of "shielded" wire
hen wiring using a commercial "hub" or a diy "hub"? For
ntercom/aviionics use.
Thanks, Skip
_______________________________ Message 12 _____________________________
_______
ime: 12:19:14 PM PST US
rom: "Noel Loveys" <noelloveys@yahoo.ca>
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
I'll take a stab at it.
he crystal and the heater for the tube are both powered by 115VAC.
onsidering the potential instability in both the voltage coming from the
all and possible changes in the frequency of the AC current it may be a bi
t
dgy.
oel
ow give us the real reason. Please!
oel
rom: owner-aeroelectric-list-server@matronics.com
mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert
L.
uckolls, III
ent: February 15, 2011 11:20 AM
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
t 08:06 AM 2/15/2011, you wrote:
I would expect the first thing to do is to verify your radio is not
ransmitting... If you have another radio close by you can test the
ransmitter is operating. An old trick we used to do with taxicabs years
go was to have someone hold a fluorescent tube (tube only completely
nplugged) close to the transmitting antenna and key the mic. If the tube
ights up the transmitter is active.
Yeah, that was the primary reason for keeping the
little NE-2 or NE-51, neon bulbs around.
Emacs!
They were handy for 'sniffing' strong RF either
within a transmitter or out on the antenna. Since
then transmitters have morphed to low-voltage, high-
current architectures. The lamps won't sniff within the
circuitry but will still light up when held in close
proximity to the tip of a 1/4-wave antenna.
Haven't tried it but I suspect it will still be
limited to getting excited at 5 watts or more.
One is looking for an RF field on the order of
75 volts or more to capacitively excite these
lamps into visible activity.
The very first transmitter I built
http://tinyurl.com/4hwa2da
had an NE-2 permanently attached to the hot side
of the tank coil and could be used to tune the
transmitter. Can anyone spot a risk-issue in
this as-published diagram?
Bob . . .
_______________________________ Message 13 _____________________________
_______
ime: 12:40:47 PM PST US
rom: "Noel Loveys" <noelloveys@yahoo.ca>
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
Certainly a short across the 1 muff cap could cause that.
oel
rom: owner-aeroelectric-list-server@matronics.com
mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Etienne
hillips
ent: February 15, 2011 11:35 AM
ubject: Re: AeroElectric-List: Re: No click when pushing PTT
'll have a stab at it - when the switch is open, the chassis sits at line
oltage?
On 15 February 2011 16:49, Robert L. Nuckolls, III
nuckolls.bob@aeroelectric.com> wrote:
an anyone spot a risk-issue in
this as-published diagram?
Bob . . .
_______________________________ Message 14 _____________________________
_______
ime: 01:01:10 PM PST US
rom: "Noel Loveys" <noelloveys@yahoo.ca>
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
Many years ago I had a radio/Amplifier which the chassis could be hot if
it
as plugged in that way you would get a terrible AC hum from the speakers..
.
always put it down to the shielding on the tubes being hot. Yes I did ge
t
everal good roots from that thing until I realized that turning the plug
round removed the AC hum.
oel
rom: owner-aeroelectric-list-server@matronics.com
mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bob
cCallum
ent: February 15, 2011 11:46 AM
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
1 The chassis is directly connected to the line.
2 the switch is in what is hopefully the ground side of the line.
3 It's probably old enough that the line plug is not polarized and the
hassis may be attached to the "hot" side of the line.
More than one person has been electrocuted with such a layout.
Bob McC
_____
From: nuckolls.bob@aeroelectric.com
ubject: RE: AeroElectric-List: Re: No click when pushing PTT
At 08:06 AM 2/15/2011, you wrote:
I would expect the first thing to do is to verify your radio is not
ransmitting... If you have another radio close by you can test the
ransmitter is operating. An old trick we used to do with taxicabs years
go was to have someone hold a fluorescent tube (tube only completely
nplugged) close to the transmitting antenna and key the mic. If the tube
ights up the transmitter is active.
Yeah, that was the primary reason for keeping the
little NE-2 or NE-51, neon bulbs around.
Emacs!
They were handy for 'sniffing' strong RF either
within a transmitter or out on the antenna. Since
then transmitters have morphed to low-voltage, high-
current architectures. The lamps won't sniff within the
circuitry but will still light up when held in close
proximity to the tip of a 1/4-wave antenna.
Haven't tried it but I suspect it will still be
limited to getting excited at 5 watts or more.
One is looking for an RF field on the order of
75 volts or more to capacitively excite these
lamps into visible activity.
The very first transmitter I built
http://tinyurl.com/4hwa2da
had an NE-2 permanently attached to the hot side
of the tank coil and could be used to tune the
transmitter. Can anyone spot a risk-issue in
this as-published diagram?
Bob . . .
_______________________________ Message 15 _____________________________
_______
ime: 02:19:46 PM PST US
ubject: AeroElectric-List: Re: Permanent Magnet Alternators - Over Voltage
rotection
rom: "markcs" <markcs@btinternet.com>
ob,
Many thanks for your reply. Your time is always much appreciated.
Regards
Mark
ead this topic online here:
http://forums.matronics.com/viewtopic.php?p=331164#331164
_______________________________ Message 16 _____________________________
_______
ime: 02:55:18 PM PST US
rom: EMAproducts@aol.com
ubject: AeroElectric-List: Re: AeroElectric-List Digest: 24 Msgs - 02/14/1
1
Bob,
xcellent comments on the list
I was a designated examiner & PPE for about 7 years on the CE 500/550
eries and along with the FAA used the AOA to see if the applicant had use
d
he "bug card" correctly in figuring his approach speeds. If I recall
orrectly was 1 Kt per mark on the AOA scale. Tell the appplicant it loo
ked
s
f he was in error on his approach speeds by a couple knots he would look
t you like you were crazy, then refigure and guess what, we were exactly
orrect, told the applicant to use equipment he had in his plane! Navy
ilots lived by AOA, they are among my best customers.
I had a pitot line freeze on a D-50 T-Bon in the late 60's seems a
echanic had bent it to make it easier to attach an engine mount, however
just
outside the cowling it had made a low spot. I lost all airspeed at about
1,000 in IMC, declared an emergency and descended into Prescott, AZ finall
y
etting airspeed back in final turn in holding pattern prior to approach
at
200 AM Been there done that.
n a message dated 2/15/2011 12:00:48 A.M. Pacific Standard Time,
eroelectric-list@matronics.com writes:
________________________________ Message 17 ____________________________
________
ime: 04:31:26 PM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: Re: AeroElectric-List: Shielded wire use with "wiring hubs"
At 01:56 PM 2/15/2011, you wrote:
What is the appropriate way to handle the shield part of "shielded"
wire when wiring using a commercial "hub" or a diy "hub"? For
intercom/aviionics use.
Thanks, Skip
Instructions for installation/fabrication should
speak to at least one pin in every connector reserved
for the purpose of connecting to shield grounds.
All shields in a bundle can be daisy-chained such
that the shields can be handled on a single wire
in one pin of the plug.
http://www.aeroelectric.com/articles/pigtail/pigtail.html
Bob . . .
________________________________ Message 18 ____________________________
________
ime: 04:33:51 PM PST US
rom: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
ubject: Re: AeroElectric-List: AOA indicator
t 03:39 PM 2/12/2011, you wrote:
<retasker@optonline.net>
If you are an EAA member you can see ALL back issues of Sport
Aviation on http://www.oshkosh365.org
If that doesn't do it for you I do have the 2005 issues but I would
have to see what issue it was in. Do you remember what month?
Sorry, no. It was mentioned on another forum.
Had an EAA membership for 20+ years but gave it
up about 10 years ago. So if anyone could find
and capture the article, I'd sure appreciate it.
Bob . . .
_______________________________ Message 19 _____________________________
_______
ime: 08:36:24 PM PST US
ubject: AeroElectric-List: Re: No click when pushing PTT
rom: "N777TY" <microsmurfer@yahoo.com>
'all lost me there :)
Anyways, back to square one. The radio works just fine... it's been insta
lled
or a little over 2 years and never had issues communicating with anyone (e
ven
istant facilities). I acquired the plane last summer and this click was
never
here.. so I can only assume it was like this from day one.. but have no wa
y
f confirming this.
For clarification -- this is a certified plane that's been flying for a lo
ng
ime..
ot a homebuilt sitting in my garage.. This radio allows me perfectly nor
mal
5 by 5" communication with anyone on frequency.. there have never been
ny issues with clarity nor strength of normal voice transmission.. It jus
t
oesn't
lick... that's all.
--------
V-7A
777TY
ead this topic online here:
http://forums.matronics.com/viewtopic.php?p=331193#331193
_______________________________ Message 20 _____________________________
_______
ime: 10:58:00 PM PST US
rom: "Vern Little" <sprocket@vx-aviation.com>
ubject: AeroElectric-List: New Stereo Audio Mixer Products
Discussed several times over the years on Aeroelectric, audio mixers
ave matured. In addition to mono audio mixer/audio panel devices and
tereo headphone adapters available for some time, Vx Aviation has
eleased a pair of stereo audio mixers in our unique form factor-- the
-sub backshell.
Although we avoid posting too much commercial material to the list, I
ope Bob appreciates what we've done here, because it's relevant to what
e have debated over the years.
Thanks, Vern Little
Summary of Announcement:
ICTORIA, BC---February 16, 2011---Vx Aviation today announced the
ntroduction of the first stereo audio mixers designed specifically for
xperimental aircraft applications. The AMX-4A and AMX-4B dramatically
implify and lower the cost of audio system installation in both
xisting
nd new aircraft. Both units are virtually pin-compatible with the
ndustry-leading AMX-2A monophonic 10 channel miniature audio mixer,
ntroduced in 2008.
Both the AMX-4A and AMX-4B units provide five independent stereo input
hannels. Three channels are fixed-level, designed to connect to audio
ources that have their own volume controls, such as EFIS systems and XM
radios. Two of the channels have screwdriver adjustable audio levels,
roviding the flexibility required when connecting to fixed level
ources.
onophonic sources are supported by connecting together the left and
ight
nputs of any input channel.
The AMX-4A low output version works seamlessly with PS Engineering
ntercoms, providing the critical 2 volt peak-to-peak voltage limiting
equired that prevents damage to the PS Engineering products. The AMX-4B
high output version has no such limiting and provides up to 12 volts
eak-to-peak drive capability and a gain of 15 decibels, making it
ompatible with intercoms that require input amplification or for
irectly
riving headphones.
for more information, including photographs and drawings, please see
ttached document>
For further inquiries, please contact me. Thank-you.
Vern Little
x Aviation
ww.vx-aviation.com
_______________________________ Message 21 _____________________________
_______
ime: 11:14:52 PM PST US
rom: "Dean Van Winkle" <dvanwinkle@royell.org>
ubject: Re: AeroElectric-List: AOA
Bob
I just noticed your comments about loss of IAS on both sides of the
eechjet. l attended 2 of your Seminars and I know we talked about both
aving worked for Cessna. When I left Cessna as a Flight Test Engineer
n 1968, I went to work for the Army Aviation Systems Cmd in St Louis as
Dept of Army Civilian Senior Aeronautical Engineer and was there for
8+ years. Most of my time there was spent with the Army's Fixed Wing
lectronic Intelligence Gathering Aircraft. In the later years I was the
rmy Technical Manager for 7 different versions of the RC-12 (Super
ingair 200), the last 4 versions comprised of 36 aircraft with 1200 SHP
ngines and Gross Weights in the 16,000 to 16,500 lb range. In the early
90s, we took the RC-12N configuration which had the largest antenna
rray to Duluth, Mn in January for natural icing tests. The Army test
rew from EAFB had a specially instrumented U-21 to search for icing
onditions and would then call out the RC-12N. I rode with the Army test
rew on flights 2 and 3 as a FTE/ Observer. On flight 2, we were in a
ow stratus layer around 3000 ft MSL, 140 KTS, about 45% cruise power.
t 50 minutes we has collected 5 1/2 inches of ice with all of the deice
oing, at 90% cruise power for the same air speed and had just lost the
ight pitot airspeed. About 3 minutes later we lost the left pitot
irspeed. About 2 minutes later, we climbed out of the low stratus layer
o the U-21 could get photos of the ice buildups. Fortunately the U-21
as able to get a picture of the right pitot which showed that ice had
rown forward on the unheated pitot mast and then curved downward to
lock the pitot inlet, at no time actually touching the pitot tube
tself. Before the U-21 could move to the left side, the left mast had
ost enough ice that the left airspeed had come back and a few minutes
ater the right airspeed was back. Beech attempted to get some heat in
he mast , but abbreviated tests the following winter showed that it was
nsufficient. Bob, I don't know whether the Beechjet used the same
itot units or a similar design, but that was our findings on the Model
00.
Alden Van Winkle
lo Build RV-9A
vanwinkle@royell.org
----- Original Message -----
From: Robert L. Nuckolls, III
To: aeroelectric-list@matronics.com
Sent: Monday, February 14, 2011 9:08 AM
Subject: Re: AeroElectric-List: AOA
At 08:03 PM 2/13/2011, you wrote:
My comment on icing and AOA systems ~~If you encounter any type of
cing turn the AOA OFF unless you have full de-icing vane & aircraft.
e haven't even done R&D on a heated vane because of liability. Even
oeing can't give you hard numbers with icing on wings. Heated vane and
cing on wings is NOT a good deal!
Elbie Mendenhall, EM Aviation, LLC www.riteangle.com
Exactly. The fleet of bizjets at HBC were all
qualified for flight into known ice. Everything
was heated or hammered.
I'll have to call some of my jet-jockey friends
at HBC and inquire as to words in the POH concerning
usefulness and cautions about AOA displays
on the production fleet.
I worked a REALLY strange problem on the Beechjet
some years back were pilots experienced loss of
IAS on BOTH sides of the airplane. Displays always
recovered at lower, warmer altitudes.
This often occurred in relatively clear air.
There was a LOT of brainstorming by a LOT
of grey beards as to the physics behind this
rare but disturbing event.
My task involved cutting a pitot tube open,
peppering it with thermocouples and putting
it back together again so that we could study
not only temperatures at the surfaces to be
de-iced but internally. There was some question
of ice crystals bouncing through the labyrinth
of pressure channels only to melt and re-freeze
inside the pitot tube.
During the fire drill for sniffing out root cause,
somebody asked the question: "How does the existence
of a working AOA display help the pilot who is
temporarily deprived of IAS?" Good question.
The Beechjet had been fitted with AOA indication
since its birth as the Mitusbishi Diamondjet.
But nobody had ever researched and written the
approve procedure for using AOA as an aid to
maneuvering without IAS.
That amendment was quickly added to the POH.
I'm not sure we ever deduced how pitot pressure
was being obstructed. I'll have to ask how that
problem resolved too. But it was interesting
that a perfectly useful display had existed
for so long but was never fully developed as a
component of plan-b, plan-c, etc. Shucks, with
DUAL air data systems, what are the odds?
Bob . . .
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Message 15
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| Subject: | Re: AOA indicator |
Are they online somewhere? Or am I looking in the wrong place?
Raymond Julian
Kettle River, MN
On 02/16/2011 10:32 AM, Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 09:44 AM 2/16/2011, you wrote:
>> <fran4sew@banyanol.com>
>>
>> Bob,
>> I did a search of past EAA articles and found the following pertaining
>> to AOA:
>
> <snip> thanks to all who responded to my query about S.A.
> articles. I now have several. It's interesting/useful to see
> what kinds of things have been published for the OBAM aviation
> community. I've added all your contributions to my library.
>
>
> Bob . . .
>
>
Message 16
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|
| Subject: | Re: cell phone rechargers |
hi all,
with my $10 tracfone came a car recharger so i am all set. have a garden
tractor battery i bought for a trail cam and never used and at least 1/2 dz
.
battery tenders around . i put a contacter together today in a metal box
with 120 volt plug and receptacle so handling a 15 amp load is no problem.
i was still a little worried about something triggering the device [
although not so much now as a power outage wont be a factor] and it would
run something for a week or two. this morning it came to me to plug a timer
in the power supply cord and interrupt the power to the circuit board every
8 hrs or so. board will shut off if on and will resume operation if it gets
the light signals.
including the tracfone i have $40 in this and it works like a million
bucks!
thanks for the input. bob noffs
On Wed, Feb 16, 2011 at 10:17 AM, Carlos Trigo <trigo@mail.telepac.pt>wrote
:
>
>
> ------------------------------
>
> *From:* owner-aeroelectric-list-server@matronics.com [mailto:
> owner-aeroelectric-list-server@matronics.com] *On Behalf Of *Robert L.
> Nuckolls, III
> *Sent:* quarta-feira, 16 de Fevereiro de 2011 14:38
>
> *To:* aeroelectric-list@matronics.com
> *Subject:* RE: AeroElectric-List: cell phone rechargers
>
>
> At 08:50 AM 2/16/2011, you wrote:
>
> It's unfortunate that there's so little standardization
> for power supplies . . . especially for cell phones.
>
>
> Recently I saw in some TV news that the great majority of world cell phon
e
> manufacturers (including Motorola, NOKIA, Siemens, Samsung ' I can=92t
> remember if iPhone and Blackberry were in) had reached an agreement exact
ly
> to standardize all cell phone chargers.
>
>
> Let=92s hope they do it quickly
>
>
> Carlos
>
> * *
>
> *
>
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> *
>
>
Message 17
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| Subject: | Re: AOA indicator |
At 05:23 PM 2/16/2011, you wrote:
>
>Are they online somewhere? Or am I looking in the wrong place?
I've posted them here.
http://www.aeroelectric.com/articles/Angle_of_Attack/
Bob . . .
Message 18
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| Subject: | Re: AOA indicator |
They display angle of attack on the left side of the screen derived from, I think,
AHARS data, not from unheated pin holes in the wing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331314#331314
Message 19
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| Subject: | Re: No click when pushing PTT |
I think the use of electro-mechanical
relays common to transceivers for 50 years have
been replaced with all solid state switching.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331315#331315
Message 20
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| Subject: | Re: Battery disconnect switch |
Remember that contactor service life predictions
are based upon switching certain kinds of loads
usually in a laboratory environment.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331316#331316
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