Today's Message Index:
----------------------
1. 04:33 AM - Re: strobes remote power (bob noffs)
2. 04:33 AM - Re: VOR/GS Antenna Installation (Hopperdhh@aol.com)
3. 04:45 AM - SD-8 PM Alternator (J. Mcculley)
4. 07:08 AM - Re: VOR/GS Antenna Installation (Rogers, Bob J.)
5. 07:10 AM - Sylvania DOT-it LED Lights (Mickey Coggins)
6. 07:31 AM - Aluminum bus bar ()
7. 08:27 AM - Re: Aluminum bus bar (Robert L. Nuckolls, III)
8. 08:30 AM - Re: VOR/GS Antenna Installation (Robert L. Nuckolls, III)
9. 09:31 AM - Re: Sylvania DOT-it LED Lights (Ed Holyoke)
10. 09:53 AM - Re: Sylvania DOT-it LED Lights (Brinker)
11. 11:05 AM - Re: TC vs T&B (Bob Darrah)
12. 11:08 AM - Re: Sylvania DOT-it LED Lights (off subject) ()
13. 12:06 PM - Re: TC vs T&B (Glaeser, Dennis A)
14. 02:28 PM - Re: Re: TC vs T&B (BobsV35B@aol.com)
15. 03:15 PM - Com Installation Sign Off ()
16. 03:15 PM - Re: Z-16 OV simplification ? (Gilles Thesee)
17. 03:56 PM - Re: Com Installation Sign Off (BobsV35B@aol.com)
18. 04:04 PM - Re: VOR/GS Antenna Installation (Hopperdhh@aol.com)
19. 08:45 PM - Re: Z-16 OV and miscellaneous (Gilles Thesee)
20. 08:46 PM - More on the TC vs T&B (BobsV35B@aol.com)
21. 08:46 PM - Re: Z-16 OV simplification ? (Robert L. Nuckolls, III)
22. 08:46 PM - Re: Re: IFR Requirements (required vs. good to have) (Mike)
23. 08:47 PM - Re: Sylvania DOT-it LED Lights (off subject) (Brinker)
24. 08:48 PM - Re: Sylvania DOT-it LED Lights (off subject) (Charlie England)
25. 08:48 PM - Re: Com Installation Sign Off (BobsV35B@aol.com)
26. 09:09 PM - More About TC vs T&B (BobsV35B@aol.com)
27. 10:04 PM - Re: Sylvania DOT-it LED Lights (off subject) ()
Message 1
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Subject: | Re: strobes remote power |
--> AeroElectric-List message posted by: "bob noffs" <icubob@newnorth.net>
hi mickey,
good website. has everything i need. thanks for the info. i would like to
buy the crimping tool too but i dont see using it for anything else so i
will go with the complete cable sets.
bob noffs
----- Original Message -----
Sent: Tuesday, June 20, 2006 12:31 AM
> --> AeroElectric-List message posted by: Mickey Coggins
> <mick-matronics@rv8.ch>
>
> bob noffs wrote:
>>
>> hi all , i have wingtip strobes to mount that also carry nav lights
>> and position lights. my power supply will be in the cabin. aeroflash
>> says to shield the strobe wires. their price for a cable made up
>> seems steep at $1.70 per foot. do all 3 strobe wires from the power
>> pack to the wingtip need to be shielded ? if not, which should i use
>> shielded for ? the paperwork with the unit doesnt say much about
>> this. thanks in advance,
>
> Yes, these need to be shielded. These guys have shielded strobe
> cable for about $1/foot: http://www.strobesnmore.com/
>
> --
> Mickey Coggins
> http://www.rv8.ch/
> #82007 finishing
>
>
> do not archive
>
>
> http://www.matronics.com/Navigator?AeroElectric-List
> http://wiki.matronics.com
>
>
>
Message 2
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Subject: | Re: VOR/GS Antenna Installation |
--> AeroElectric-List message posted by: Hopperdhh@aol.com
Bob,
That depends somewhat on exactly what the configuration of your antenna is.
Please describe the antenna in some detail.
VOR antennas from the "factory" use a balun to make the antenna balanced
with respect to ground. This balun device (meaning BALanced to UNbalanced) is
often a special small 1:1 transformer. A balun makes the pattern symmetrical
with respect to ground, or more ideal. From antenna information given in
Narco VOR manuals, it is important to be sure the antenna is horizontally
polarized. Without the balun the feedline can become part of the antenna system
and
the polarity may no longer be purely horizontal. This would make the
antenna more prone to respond to reflected signals which of course would come
from
a direction other than where the VOR station is located.
A broadband balun which can be used for VOR (because the VOR band is between
TV channels 6 and 7) can be found in almost all older TV sets which have
both balanced (300 ohm twin lead) and unbalanced (75 ohm coax) antenna
connections on the back.
When the received signal is fairly strong, the grounded coax shield will not
make any difference. When the signal is weak is when the "ideal" antenna
becomes more necessary.
Dan K9WEK
Walton, IN
RV-7A
In a message dated 6/19/2006 12:40:01 P.M. Eastern Daylight Time,
BRogers@fdic.gov writes:
--> AeroElectric-List message posted by: "Rogers, Bob J." <BRogers@fdic.gov>
I know that a VOR/GS antenna is a dipole antenna and does not need a
ground plane. The RG-400 co-ax cable that connects my Nav radio to the
VOR/GS antenna in my all-aluminum kit plane has a center wire and the
outer shield. The shield is attached to the outer portion of the BNC
connector, which mates to a female connector on the radio that touches
the metal radio frame - thus the outer shield on the cable is grounded.
Also, the way my antenna is currently mounted, the outer shield portion
of the female BNC connector of the antenna also touches the airframe and
is thus, grounded.
What effect does the fact that one side of the antenna connection is
grounded have on the performance of the VOR/GS antenna? I know that the
antenna does not have to be grounded to work, but what happens if it is?
Message 3
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Subject: | SD-8 PM Alternator |
--> AeroElectric-List message posted by: "J. Mcculley" <mcculleyja@starpower.net>
Bob N,
Here is some in-flight data I obtained while waiting for your comments
on my 5/7/06 response to your questions. The flight configuration is the
same as the ground test set-up with 15k resistor at the diodes and 3k
resistor across a capacitor of 56k mf. All RPM is that of the engine,
with the alternator turning at 1.3 times the engine RPM.
Engine RPM 600 800 900 1000 1100 1200 1800 2700
Capacitor Volts 5.98 8.47 10.4 12.61 13.31 14.4 14.42 14.42
Upon engine start with only the Master on for cranking and then
immediately turned off, the voltage across the capacitor rises very
slowly over several minutes to stabilize at the above listed values.
As soon as the voltage across the capacitor eventually rises above
0.601, the alternator will come alive if the alternator switch is
activated. If the alternator is not turned on the capacitor voltage
will track the above listed values as the engine RPM is varied up or
down, but there is a time lag dependent upon the size of the capacitor.
An interesting observation is that the initial very slow rise after
engine start to the 0.601 capacitor voltage then takes an immediate jump
from 0.601 to 5.98 volts (or any above listed voltage based on the
engine RPM at that moment) and thereafter never again falls below 0.601
volts unless the engine is shut down. Therefore, the alternator is
always available to come on line by activating the alternator switch
once the 0.601 condition has been reached and the engine has not been
shut down.
Tests were conducted using cockpit adjustable pots for both the
resistance at the diodes as well as across the capacitor. A capacitor of
only 1kmf was also tested. The diode resistor seems optimum at 10k to
15k with 3k across the capacitor. The 1kmf capacitor is too little to
prevent voltage excursions up to 16 volts and probably higher if not
carefully monitored. This may not be a problem since the alternator is
not on line at that time, but it might be if the alternator were to be
switched on during that condition, even though the regulator recovered
quickly in the one instance when I did switch it on at that point.
At this time, I am comfortable with the system when using the component
values as listed in the first paragraph above. Some lower value
capacitor could be used with good results I would think, but my guess is
it probably should be at least in the ball park of 10 to 20kmf,
My personal opinion at this time is that this set-up provides the SD-8
with an automatic capability to be brought on line at any time without
depending on a voltage source being present such as the battery or a
powered buss that the SD-8 is being switched onto. If the engine is
running or being motored above 600 RPM (780 alternator RPM) the pilot
can activate the alternator switch and bring power to even a dead buss
if he chooses. Also, for anyone wanting an alternator power source but
without a battery or starter, this will work if hand propping is the
planned mode.
Please review and comment when your time permits.
Jim McCulley
Message 4
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Subject: | VOR/GS Antenna Installation |
--> AeroElectric-List message posted by: "Rogers, Bob J." <BRogers@fdic.gov>
My antenna is a factory manufactured Comant V dipole VOR/GS antenna with
an integral balun (hockey puck style). My main concern is whether the
shield portion of the feed line (RG-400 cable) must be isolated from the
airframe. Right now, it is connected to ground at both the antenna end
and at the radio end. I do not know whether that makes a difference in
the performance of the antenna/nav radio.
-----Original Message-----
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Hopperdhh@aol.com
Sent: Tuesday, June 20, 2006 6:30 AM
--> AeroElectric-List message posted by: Hopperdhh@aol.com
Bob,
That depends somewhat on exactly what the configuration of your antenna
is.
Please describe the antenna in some detail.
VOR antennas from the "factory" use a balun to make the antenna
balanced
with respect to ground. This balun device (meaning BALanced to
UNbalanced) is
often a special small 1:1 transformer. A balun makes the pattern
symmetrical
with respect to ground, or more ideal. From antenna information given
in
Narco VOR manuals, it is important to be sure the antenna is
horizontally
polarized. Without the balun the feedline can become part of the
antenna system and
the polarity may no longer be purely horizontal. This would make the
antenna more prone to respond to reflected signals which of course
would come from
a direction other than where the VOR station is located.
A broadband balun which can be used for VOR (because the VOR band is
between
TV channels 6 and 7) can be found in almost all older TV sets which
have
both balanced (300 ohm twin lead) and unbalanced (75 ohm coax) antenna
connections on the back.
When the received signal is fairly strong, the grounded coax shield will
not
make any difference. When the signal is weak is when the "ideal"
antenna
becomes more necessary.
Dan K9WEK
Walton, IN
RV-7A
In a message dated 6/19/2006 12:40:01 P.M. Eastern Daylight Time,
BRogers@fdic.gov writes:
--> AeroElectric-List message posted by: "Rogers, Bob J."
<BRogers@fdic.gov>
I know that a VOR/GS antenna is a dipole antenna and does not need a
ground plane. The RG-400 co-ax cable that connects my Nav radio to the
VOR/GS antenna in my all-aluminum kit plane has a center wire and the
outer shield. The shield is attached to the outer portion of the BNC
connector, which mates to a female connector on the radio that touches
the metal radio frame - thus the outer shield on the cable is grounded.
Also, the way my antenna is currently mounted, the outer shield portion
of the female BNC connector of the antenna also touches the airframe
and
is thus, grounded.
What effect does the fact that one side of the antenna connection is
grounded have on the performance of the VOR/GS antenna? I know that
the
antenna does not have to be grounded to work, but what happens if it
is?
Message 5
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Subject: | Sylvania DOT-it LED Lights |
Hi,
Has anyone considered these or something similar for cockpit lighting?
http://tinyurl.com/llbjp
They seem to be battery powered, and just stick onto
any surface. Seems like the future...
--
Mickey Coggins
http://www.rv8.ch/
#82007 finishing
Attachment: http://www.matronics.com/enclosures/f34b6cb1ce42b990d861137c04dc469c3210e178.jpg
Message 6
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Subject: | Aluminum bus bar |
--> AeroElectric-List message posted by: <tomvelvick@cox.net>
Hi Bob,
I am relocating and rewiring the switches/circuit breakers in my wifes plane.
I found that the switch breakers in the panel were all connected to power with
a .025 1/2 by 6 inch aluminum bus bar. I have never seen anyone use a thin piece
of aluminum before. It seems woefully inadequate to me. Just wondering
how bad an installation this was and what would have happened if all of the switches
were on together for a long time. Since we dont do much night flying,
most of the switches are normally off.
Regards,
Tom Velvick
Message 7
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Subject: | Re: Aluminum bus bar |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 10:26 AM 6/20/2006 -0400, you wrote:
>--> AeroElectric-List message posted by: <tomvelvick@cox.net>
>
>Hi Bob,
>I am relocating and rewiring the switches/circuit breakers in my wifes
>plane. I found that the switch breakers in the panel were all connected
>to power with a .025 1/2 by 6 inch aluminum bus bar. I have never seen
>anyone use a thin piece of aluminum before. It seems woefully inadequate
>to me. Just wondering how bad an installation this was and what would
>have happened if all of the switches were on together for a long
>time. Since we dont do much night flying, most of the switches are
>normally off.
It's been done many times. Not recommended but I'm also
not aware of any cases where use of aluminum versus brass
or copper was the cause of any problem. Getting a gas-tight
connection at the fasteners is the key irrespective of what
materials are used.
If you have an opportunity to swap out for brass, it wouldn't
be a bad thing to do . . .
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
Message 8
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Subject: | VOR/GS Antenna Installation |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 09:02 AM 6/20/2006 -0500, you wrote:
>--> AeroElectric-List message posted by: "Rogers, Bob J." <BRogers@fdic.gov>
>
>My antenna is a factory manufactured Comant V dipole VOR/GS antenna with
>an integral balun (hockey puck style). My main concern is whether the
>shield portion of the feed line (RG-400 cable) must be isolated from the
>airframe. Right now, it is connected to ground at both the antenna end
>and at the radio end. I do not know whether that makes a difference in
>the performance of the antenna/nav radio.
Probably no problem but it's only necessary that the coax
shield have good connection at the balun and radio connectors.
If the coax shield becomes grounded to airframe at the antenna
end due to the way the antenna is designed, then so be it.
Comant knows what they're doing. But if I were building a cat-whisker
antenna to attach to the end of a coax, I'd leave the shield free
of airframe ground at the antenna end.
Bob . . .
Message 9
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Subject: | Re: Sylvania DOT-it LED Lights |
--> AeroElectric-List message posted by: Ed Holyoke <bicyclop@pacbell.net>
Kinda big and not dimmable. I wonder how the reusable adhesive will hold up to
vibration, heat and such.
I use a lip light that I bought at Wicks for about $40. The battery case is kinda
clunky, but the light is perfect. The light clamps onto your headset mike
boom. You can put dimmable red or white light wherever you look.
Pax,
Ed Holyoke
Mickey Coggins <mick-matronics@rv8.ch> wrote:
Hi,
Has anyone considered these or something similar for cockpit lighting?
http://tinyurl.com/llbjp
They seem to be battery powered, and just stick onto
any surface. Seems like the future...
--
Mickey Coggins
http://www.rv8.ch/
#82007 finishing
Attachment: http://www.matronics.com/enclosures/f34b6cb1ce42b990d861137c04dc469c3210e178.jpg
Message 10
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Subject: | Re: Sylvania DOT-it LED Lights |
--> AeroElectric-List message posted by: "Brinker" <brinker@cox-internet.com>
Looks like a fantastic idea if the batteries last 100 hours as
stated. I was planning on going with basicly the same type of lights but
wired. These should be much simpler and save some wiring time and weight. I
think I will give them a try. Thanks for the link.
Randy
----- Original Message -----
Sent: Tuesday, June 20, 2006 9:08 AM
> Hi,
>
> Has anyone considered these or something similar for cockpit lighting?
>
> http://tinyurl.com/llbjp
>
> They seem to be battery powered, and just stick onto
> any surface. Seems like the future...
>
> --
> Mickey Coggins
> http://www.rv8.ch/
> #82007 finishing
>
--------------------------------------------------------------------------------
> Attachment:
> http://www.matronics.com/enclosures/f34b6cb1ce42b990d861137c04dc469c3210e178.jpg
>
Message 11
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--> AeroElectric-List message posted by: "Bob Darrah" <RDarrah@austin.rr.com>
I didn't think that how they worked made much difference, the big difference
is the presentation to the pilot. The turn nedle shows the direction and
rate of turn. Very hard to misinterperate. If it points to the left, you
are yawing (turning) to the left. If you made one with a canted gyro, it
would be just as usful to the pilot.
The turn coordinator looks too much like the attitude indicator. It, unlike
the attitude indicator, showes which way you are turning by showing a
banking airplane, while the attitude indicator showes your relation to the
horizon. These presentations end up being exactly opposite to each other
leading to easy misinterpratation of the turn cooridnator.
I'll take the turn needle every time.
New Bob (as apposed to Old Bob and the other Bob's)
Message 12
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Subject: | Re: Sylvania DOT-it LED Lights (off subject) |
--> AeroElectric-List message posted by: <rparigor@suffolk.lib.ny.us>
I am going a bit off subject here.
Am going to install these inside wings and fuse:
http://www.besthongkong.com/product_info.php?cPath=6&products_id=84
Have clear inspection covers and am going to wire a reed switch so can
inspect prior to flight. Will add LEDs if needed. Pretty nice thing for a
dollar or less, has Lithium battery.
Check out their LEDs, you could add angle of choice LED to this package on
the cheap and stick anywhere you wish in cockpit. It has a momentary
switch and a leaveitonalltheetime switch. Even sell one with black light.
Also off subject is using these for interior?? :
http://www.besthongkong.com/index.php?cPath=9_30
http://www.besthongkong.com/index.php?cPath=9_37
http://www.besthongkong.com/product_info.php?cPath=9_20&products_id=102
You need to supply power, a battery, ship power, hand crank or Faraday
generator will do.
Ron Parigoris
Message 13
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--> AeroElectric-List message posted by: "Glaeser, Dennis A" <dennis.glaeser@eds.com>
Hello Old Bob,
I don't remember where I found the explanation I posted - I came across
it when I was teaching ground school at Parks College (in the late '70s
through early '90s). Saying 'one of the main reasons it was created' is
undoubtedly overstatement/embellishment based on inaccurate
recollection, but I clearly remember that the main point was the
'advantage' of the canted gyro being positive feedback for the pilot in
a high-rate turn, which is why it stuck with me. It makes sense that
it's roots are in autopilot design. Sounds like the stuff I remember
was part of the justification (or sales pitch) for making it a
stand-alone instrument.
Dennis Glaeser
-------------------------------------
Good Morning Dennis,
Your explanation of the origin of the canted gyro instrumentation may
have merit, but it is certainly NOT the way my ancient brain recalls the
facts. I am not claiming my version is the only correct one, but here
goes!
<snip>...
Message 14
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--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 6/20/2006 2:09:10 P.M. Central Standard Time,
dennis.glaeser@eds.com writes:
Sounds like the stuff I remember
was part of the justification (or sales pitch) for making it a
stand-alone instrument.
Dennis Glaeser
Good Afternoon Dennis,
As I mentioned earlier, when the instrument first became available, it
sounded like a good idea to me. It was only after a few years of observing the
results that I changed my mind.
Thanks for the additional information you have provided.
Do Not Archive
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
Message 15
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Subject: | Com Installation Sign Off |
--> AeroElectric-List message posted by: <jlundberg@cox.net>
I am installing am ICOM A200 com in my Aeronca Champ (I am not an A&P or IA) -
What is the correct documentation in the logbooks??? Can I have an A&P sign
it off or do I need a repair station sign off.?
John
Message 16
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Subject: | Re: Z-16 OV simplification ? |
--> AeroElectric-List message posted by: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
> 16v at 20A (320 watts) in a Rotax system described in Z-16.
> That's a real boss-hog zener.
>
Bob,
Thank you.
Is the problem the same with a transil ?
Regards,
Gilles
http://contrails.free.fr
Message 17
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Subject: | Re: Com Installation Sign Off |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 6/20/2006 5:17:17 P.M. Central Standard Time,
jlundberg@cox.net writes:
I am installing am ICOM A200 com in my Aeronca Champ (I am not an A&P or
IA) - What is the correct documentation in the logbooks??? Can I have an
A&P sign it off or do I need a repair station sign off.?
John
Good Evening John,
Nothing authoritative to point to, but my WAG is that you will need to file
a 337 if it is a permanent installation. Are you using an external antenna and
powering the set from the aircraft's electrical system or is just a handheld
that is in a clip using a rubber ducky and internal batteries?
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
Message 18
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Subject: | Re: VOR/GS Antenna Installation |
--> AeroElectric-List message posted by: Hopperdhh@aol.com
Bob,
It is probably OK to ground the shield at both ends. In any case, the
recommendations of the manufacturer should be followed. If it has a balun, that
should solve the problem of making both sides of the antenna equally "hot."
Dan
In a message dated 6/20/2006 10:10:29 A.M. Eastern Daylight Time,
BRogers@fdic.gov writes:
My antenna is a factory manufactured Comant V dipole VOR/GS antenna with
an integral balun (hockey puck style). My main concern is whether the
shield portion of the feed line (RG-400 cable) must be isolated from the
airframe. Right now, it is connected to ground at both the antenna end
and at the radio end. I do not know whether that makes a difference in
the performance of the antenna/nav radio.
-----Original Message-----
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Hopperdhh@aol.com
Sent: Tuesday, June 20, 2006 6:30 AM
--> AeroElectric-List message posted by: Hopperdhh@aol.com
Bob,
Message 19
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Subject: | Re: Z-16 OV and miscellaneous |
--> AeroElectric-List message posted by: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
> 16v at 20A (320 watts) in a Rotax system described in Z-16.
> That's a real boss-hog zener. Further, adding such a zener would
> only keep the voltage from rising, it would not SHUT OFF or DISCONNECT
> the offending system.
>
Bob,
Thank you for responding.
By the way, my buddy also raised an issue apropos the OV protection in
figure Z16. He suggest that the sense (C) wire be connected to the
capacitor and never be severed, lest the Rotax regulator should lose
voltage reference and go berserk.
What's your opinion ?
Thanks,
Regards,
Gilles
http://contrails.free.fr
Message 20
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Subject: | More on the TC vs T&B |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 6/19/2006 12:59:27 A.M. Central Standard Time,
mick-matronics@rv8.ch writes:
There is a picture along with an explanation here:
http://en.wikipedia.org/wiki/Turn_coordinator
Good Morning Mickey,
Thanks for that reference, but don't you think it slides rather rapidly over
some very important points?
It also does not address the problems of using either instrument as the
prime source of information for recovery following a bout with vertigo.
If we are using a turn needle, (T&B) it has nothing about it that even
suggests a
wing or whether or not the aircraft is level. All it does is tell us if the
airplane is yawing. If it isn't yawing, it isn't turning. I think that
indication is MUCH easier for a confused pilot to accept.
Go out someday in an aircraft equipped with a Turn Coordinator and do a nice
strong Knife Edge. Doesn't it seem rather strange to be flying that knife
edge and also be looking at the turn coordinator that is showing a "Wings
Level" indication?
Very Confusing to my old mind!
Do the same maneuver in an airplane equipped with a T&B. The T&B will be
sitting in the center for the same reason the TC was showing wings level.
No turns and no yaw in a properly flown knife edge.
Isn't it a lot easier for even we experienced aviators to accept that
the T&B is doing what it should be doing than it is to accept that the
wings level indication of the TC is proper?
The TC is always compromised. There is no way to determine if it is showing
a roll or a yaw without using supporting information.
If a T&B needle is showing an indication, the aircraft is yawing.
No yaw, no turn.
No turn, no graveyard spiral.
If the aircraft does not turn, it will survive!
Until such time as 'Lectric Bob provides us with a full time, low cost,
autopilot to keep us from making excessive turning maneuvers, I vote for the T&B.
Do Not Archive
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
Message 21
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Subject: | Re: Z-16 OV simplification ? |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
At 12:11 AM 6/21/2006 +0200, you wrote:
>--> AeroElectric-List message posted by: Gilles Thesee
><Gilles.Thesee@ac-grenoble.fr>
>
>
>>16v at 20A (320 watts) in a Rotax system described in Z-16.
>> That's a real boss-hog zener.
>>
>
>Bob,
>
>Thank you.
>Is the problem the same with a transil ?
Yes. TVS, Transorbs, Transil, etc are all cousins of the
zener diode. They're designed to avalanche (break down)
when reverse biased and at reasonably calibrated voltages.
Instead of designing for accuracy and stability as voltage
regulators, transient catchers are optimized for power and
speed . . . but they're still linear mode gizmos. So while
a 1500 watt Transorb is barely larger physically than a
1N5400 series diode that's rated to dissipate 3A at 0.7 volts
indefinitely, that's just over two watts.
Guess what? A 1.5KE series transient suppressor is rated
for 1500 watts . . . for milliseconds. See:
http://www.aeroelectric.com/Mfgr_Data/Semiconductors/15ke.pdf
The operative word for using these devices is "transient" meaning
relatively short (tens of milliseconds) events. A runaway alternator
is an all-day event until you get it turned off . . . linear
voltage clamping devices tied to the output of alternators are
not OV protection devices.
They might mitigate load dumps but folks on the list have reported
problematic results in tests where load dump events trashed
a Transorb.
OV protection needs to be discriminating (not to nuisance
trip on true transient conditions) but they also need
to have absolute control over the alternator in terms of
shutting it off.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
Message 22
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Subject: | Re: IFR Requirements (required vs. good to have) |
--> AeroElectric-List message posted by: "Mike" <mlas@cox.net>
John,
It sounds like you have given this issue some thought. What is your
alternative plan when facing a stand of trees or a field of rock? I too
have thought about the same issue and have not been able to come up with
a better idea. One thing to remember is my primary point was that you
still has to be a landing and then you stop the plane. My thoughts are
to think of a formula 1 car which is strong like the Glassair. From my
direct examination of composite aircraft crashes at the site, the impact
into the ground is what seems to kill most of the pilots and not the
stop after the landing. Most of the crashes in composite airplanes are
burners, lots of little pieces, or almost no breakup damage. The
burners are strait forward and mixed, but the airplanes that breakup are
all high velocity impacts.
Mike
-----Original Message-----
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of John
Burnaby
Sent: Sunday, June 18, 2006 11:25 AM
to have)
Do not archive
Mike,
You have repeated what an experienced 4 engine water bomber pilot, in
the Pacific northwest, told me when I asked him, as a newly minted pilot
in 1980, "What do you do when forced down in a forest?" He said to land
between two trees to shear off the wings to absorb and diminish a lot of
the energy involved in the landing.
I filed that away on my brain's essential bus, hoping that I never have
to access it. However, since I began building my Glasair, with its one
piece wing that would be housing my valuable (at least to me) bottom at
an inhospitable landing site, I have wondered if the aiming between two
solid objects is a prudent idea. From a lay person perspective, the
Glasair wing is built hell-for-stout, and its fuelage anchor points seem
less so, as their function is mainly to keep the wing attached during
negative G. I have visions of landing between two trees still sitting in
the wing and the inertia of the empennage, still moving at 70 kts,
ruining any chance of smugness to which I might be entitled.
Hopefully, I am over estimating the strength of that spar.
Cheers,
John
--
--
Message 23
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Subject: | Re: Sylvania DOT-it LED Lights (off subject) |
--> AeroElectric-List message posted by: "Brinker" <brinker@cox-internet.com>
The 12v hardwired ones are similar to the ones I have bought from
http://autolumination.com/fixtures.htm they put out plenty of light for
passengers and luggage bay, even thought about mounting them overhead pilot
& co-pilot, but do not have a switch built into them. I think I will
purchase some of the 12v Sylvania's even if I don't use them in airplane
they will be handy for other ap's. I think your idea of the clear inspection
cover's is very good do you mind if I steal it ?
Randy
----- Original Message -----
Sent: Tuesday, June 20, 2006 12:52 PM
> --> AeroElectric-List message posted by: <rparigor@suffolk.lib.ny.us>
>
> I am going a bit off subject here.
>
> Am going to install these inside wings and fuse:
> http://www.besthongkong.com/product_info.php?cPath=6&products_id=84
> Have clear inspection covers and am going to wire a reed switch so can
> inspect prior to flight. Will add LEDs if needed. Pretty nice thing for a
> dollar or less, has Lithium battery.
>
> Check out their LEDs, you could add angle of choice LED to this package on
> the cheap and stick anywhere you wish in cockpit. It has a momentary
> switch and a leaveitonalltheetime switch. Even sell one with black light.
>
> Also off subject is using these for interior?? :
> http://www.besthongkong.com/index.php?cPath=9_30
> http://www.besthongkong.com/index.php?cPath=9_37
> http://www.besthongkong.com/product_info.php?cPath=9_20&products_id=102
> You need to supply power, a battery, ship power, hand crank or Faraday
> generator will do.
>
> Ron Parigoris
>
>
>
Message 24
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Subject: | Re: Sylvania DOT-it LED Lights (off subject) |
--> AeroElectric-List message posted by: Charlie England <ceengland@bellsouth.net>
rparigor@SUFFOLK.LIB.NY.US wrote:
>--> AeroElectric-List message posted by: <rparigor@suffolk.lib.ny.us>
>
>I am going a bit off subject here.
>
>Am going to install these inside wings and fuse:
>http://www.besthongkong.com/product_info.php?cPath=6&products_id=84
>Have clear inspection covers and am going to wire a reed switch so can
>inspect prior to flight. Will add LEDs if needed. Pretty nice thing for a
>dollar or less, has Lithium battery.
>
>Check out their LEDs, you could add angle of choice LED to this package on
>the cheap and stick anywhere you wish in cockpit. It has a momentary
>switch and a leaveitonalltheetime switch. Even sell one with black light.
>
>Also off subject is using these for interior?? :
>http://www.besthongkong.com/index.php?cPath=9_30
>http://www.besthongkong.com/index.php?cPath=9_37
>http://www.besthongkong.com/product_info.php?cPath=9_20&products_id=102
>You need to supply power, a battery, ship power, hand crank or Faraday
>generator will do.
>
>Ron Parigoris
>
If you're building an AL airframe, you might want to check with the kit
designer before replacing the inspection covers with plexi. Some
designers treat the covers as structural parts of the airframe.
FWIW...
Message 25
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Subject: | Re: Com Installation Sign Off |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 6/20/2006 5:17:17 P.M. Central Standard Time,
jlundberg@cox.net writes:
I am installing am ICOM A200 com in my Aeronca Champ (I am not an A&P or
IA) - What is the correct documentation in the logbooks??? Can I have an
A&P sign it off or do I need a repair station sign off.?
John
Good Evening Once again John,
I guess I should have added that a 337 needs to be submitted by an IA or a
repair station. An A&P can fill it out and sign for the work, but it must be
approved by an A&P holding an IA or a repair station inspector before it is
submitted. At least that is my often wrong interpretation of the pertinent
regulations!
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
Message 26
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Subject: | More About TC vs T&B |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 6/19/2006 12:59:27 A.M. Central Standard Time,
mick-matronics@rv8.ch writes:
There is a picture along with an explanation here:
http://en.wikipedia.org/wiki/Turn_coordinator
Good Morning Mickey,
Thanks for that reference, but don't you think it slides rather rapidly over
some very important points?
It also does not address the problems of using either instrument as the
prime source of information for recovery following a bout with vertigo.
If we are using a turn needle, (T&B) it has nothing about it that even
suggests a
wing or whether or not the aircraft is level. All it does is tell us if the
airplane is yawing. If it isn't yawing, it isn't turning. I think that
indication is MUCH easier for a confused pilot to accept.
Go out someday in an aircraft equipped with a Turn Coordinator and do a nice
strong Knife Edge. Doesn't it seem rather strange to be flying that knife
edge and also be looking at the turn coordinator that is showing a "Wings
Level" indication?
Very Confusing to my old mind!
Do the same maneuver in an airplane equipped with a T&B. The T&B will be
sitting in the center for the same reason the TC was showing wings level.
No turns and no yaw in a properly flown knife edge.
Isn't it a lot easier for even we experienced aviators to accept that
the T&B is doing what it should be doing than it is to accept that the
wings level indication of the TC is proper?
The TC is always compromised. There is no way to determine if it is showing
a roll or a yaw without using supporting information.
If a T&B needle is showing an indication, the aircraft is yawing.
No yaw, no turn.
No turn, no graveyard spiral.
If the aircraft does not turn, it will survive!
Until such time as 'Lectric Bob provides us with a full time, low cost,
autopilot to keep us from making excessive turning maneuvers, I vote for the T&B.
Do Not Archive
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
Message 27
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Subject: | Re: Sylvania DOT-it LED Lights (off subject) |
--> AeroElectric-List message posted by: <rparigor@suffolk.lib.ny.us>
Hello Randy
"I think your idea of the clear inspection cover's is very good do you
mind if I steal it ?"
Not at all. Keep in mind some plastics, may be strong (lexan) but scratch
very easily. Look and test first, some have scratch resistant finish.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
One nice thing about using a reed switch, I want to be able to inspect
below the baggage bay bulkhead in my 914 Europa Monowheel where there is a
rats nest of fuel lines, fittings, pumps, gasculators, 1 way valves, water
drains, adapters, couplers, "Y"s and a manifold. When something leaks and
makes that perfect explosive mixture, turning on a reed switch will
probably not give me more light than I wanted while half leaning in plane.
I am sure those molecules are patient and can wait until I am complete
inside the plane, till I throw some soft stuff in the baggage area,
landing on top of the plastic inspection cover, electrostatic charging it,
and because I did not overly tighten the screws fearing cracking the
plastic,will allow the cover to slight move and discharge, thus negating
the need for cabin heat!
Do not archive
Ron Parigoris
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