Today's Message Index:
----------------------
1. 05:14 AM - Re: Tefzel dielectric strength (Sam Hoskins)
2. 06:16 AM - Re: AeroElectric-List Digest: 18 Msgs - 02/13/08 (John Markey)
3. 07:17 AM - Re: Re: AeroElectric-List Digest: 18 Msgs - 02/13/08 (H. M. Haught Jr.)
4. 08:37 AM - Motor sizing study (Robert L. Nuckolls, III)
5. 08:48 AM - Re: Boeing 767 speeds (was External antennas) ()
6. 09:04 AM - Re: Re: Tefzel dielectric strength (Charlie England)
7. 09:18 AM - Re: Motor sizing study (oops!) (Robert L. Nuckolls, III)
8. 10:57 AM - Re: Lights . . . how big do they really need to be? (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Tefzel dielectric strength |
Sounds great, Bob. Big help! Thanks!
Sam Hoskins
Murphysboro, IL
On Feb 15, 2008 9:29 PM, Robert L. Nuckolls, III <nuckolls.bob@cox.net> wrote:
>
> At 05:21 PM 2/15/2008 -0600, you wrote:
>
> >
> >That sounds like logical information. What about the 300V rating on
> >the wire? Would the tefzel be similar? Here is the wire at B&C:
> >http://www.bandc.biz/cgi-bin/ez-catalog/cat_display.cgi?8X358218#s906-3-22
>
> I don't recall any of the tefzel wires being rated at less
> than 600v. You can check through the listings for 22759 in
> ETFE in the catalog at:
>
> http://www.aeroelectric.com/Mfgr_Data/Wire/Standard_Wire_and_Cable/Std_Wire_Cable.pdf
>
> I suspect B&C's shielded trio is 22759/16 or 22759/34
> both of which are 600v insulations.
>
> Bob . . .
>
>
Message 2
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| Subject: | Re: AeroElectric-List Digest: 18 Msgs - 02/13/08 |
Two other items to check:
1. intermittent problem with the microphone on your headset, especially if it is
an electric ANR type set. I had a similar issue with GYY tower - drove us all
nuts. I only had this problem on first flight from the tower [moisture condensing
on the mike?]. have two Lightspeed headsets, and I only had this issue
with the primary set - a 20 series. No issue with the 15-series unit as long as
it has good batteries in it. The unit gets goofy right before the batteries
become too weak to drive the ANR.
Just 2 weeks ago I sent my primary unit back to Lighspeed for a checkup. They replaced
the mike [for free] to correct an "intermittent feedback" between the
microphone and the electronics.
2. If you are using an ANR set, check if your auto squelch on the radio is interfering
with the headset. Again, I had a friend who wrassled with this last summer,
only to discover the auto function on his radio was fighting the headset.
He shut the function off, and all was fine with the tower.
Finally: a Pirep from a friend who has owned a Lightspeed ZULU for 3 months. He
loves it. Very light, very quiet, and it has an MP3 jack feeding his player into
it, with auto volume reduction during all incoming/outgoing radio calls. It
also accepts bluetooth from a player or phone. I'm buying one to greatly simplify
my audio plans!
Good luck,
John
Time: 05:38:15 PM PST US
From: "H. M. Haught Jr. "
Subject: Re: AeroElectric-List: Why can't the tower hear me?
Steve -
This is strange! I fly into KOUN regularly. When I fly in, I'm
communicating with flight following with no problems, and transfer off
to KOUN okay. The next day, sitting on the ramp, radio cold, they tell
me that my radio is unreadable. I've had the radio checked out
throughly by two different radio shops now 4 times. Now it is starting
to happen at another airport KSAG. Yet, I taxi across the field at
KASG, the radio shop does a check, call up tower, and everything is
normal. Makes no sense and I think something is wrong with THEIR
radios. And no, it isn't wind noise. I've tried everything, even my
handheld, and at KOUN, they say they cannot understand it either,
although at KASG, the handheld usually works. I keep telling them that
they have something wrong with their system, which has now made me
almost persona non grata at their facility. I'm using an ICOM radio and
have had absolutely no problems with anyone else reading me other than
those two places, and was all over California, Texas, New Mexico, and
Arizona with it last December and January, with no problems whatsoever.
I use flight following on every flight, and occasionally someone will
tell me my radio has some background noise, but I've gotten in the habit
of asking for radio checks and always get a good report. The only
places I have problems is KOUN and KASG, and usually only on initial
call up. Once I'm airborne, they can generally hear me fine.
I'd say we have a similar problem - let's stay in touch until we find
some way to resolve it.
M. Haught
Steve Ruse wrote:
>
>
> I fly an open cockpit experimental (Pietenpol). My radio is a Vertex
> Standard VXA-150 (handheld), powered by an external 8AH/12v battery.
> I have an antenna mounted on a ground plane on the belly, in front of
> the gear. I have no problems communicating air to air with other
> planes, I have actually maintained contact air-air with friends at
> distances over 125NM. My calls were reported as loud and clear. I
> was based at a class D airport (KFTW) for about one year, and never
> had trouble with the tower there.
>
> Two years ago, I moved to a new area, near a class D airport that I
> occasionally go to (KOUN in Norman, OK). I often have trouble being
> understood by the tower, even though all pilots indicate that my
> transmissions are loud and clear. Last weekend I tried to enter the
> class D, but both times I called, the tower responded saying that my
> transmissions were "scratchy and unintelligable". I was about 6NM
> away and could actually see the tower. I immediately switched to
> another frequency, and heard traffic on the CTAF at KGYI, about 95NM
> away. I called them and asked for a radio check. That pilot replied
> that I was loud and clear. Not wanting to bother the tower or cause
> trouble in their airspace, I turned away before entering.
>
> I am baffled by this. What would cause me to be unintelligable to the
> KOUN tower repeatedly, when no one else has trouble understanding me,
> even at long distances? I was on a heading for the tower, and I know
> my transmission strength in that direction (forward) is good. AND it
> was only six miles away.
>
> My only theory is that the tower doesn't like the wind noise in my
> mic...but I have a noise cancelling mic, with a leather wind-blocking
> mic cover, AND other pilots report my transmissions as clear.
>
> Any thoughts on what might cause this would be appreciated. It is
> difficult to trouble shoot because I have to bother the tower to
> replicate the problem.
>
> Steve Ruse
"I have sworn upon the altar of God, eternal hostility against every form of tyranny
over the mind of man."
-- Thomas Jefferson
---------------------------------
Message 3
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| Subject: | Re: AeroElectric-List Digest: 18 Msgs - 02/13/08 |
Thanks John -
I use a regular David Clark 10.13 Headset and with M-7a noise canceling
mic. If there are problems again, I will check the placement of the
mic. I keep it just off my lips, as per instructions, but there could
be some interference. thanks for the tip. I also have a pair of
Lightspeeds I bought from my neighbor, but have never used them.
M. Haught
John Markey wrote:
> Two other items to check:
>
> 1. intermittent problem with the microphone on your headset,
> especially if it is an electric ANR type set. I had a similar issue
> with GYY tower - drove us all nuts. I only had this problem on first
> flight from the tower [moisture condensing on the mike?]. have two
> Lightspeed headsets, and I only had this issue with the primary set -
> a 20 series. No issue with the 15-series unit as long as it has good
> batteries in it. The unit gets goofy right before the batteries become
> too weak to drive the ANR.
>
> Just 2 weeks ago I sent my primary unit back to Lighspeed for a
> checkup. They replaced the mike [for free] to correct an "intermittent
> feedback" between the microphone and the electronics.
>
> 2. If you are using an ANR set, check if your auto squelch on the
> radio is interfering with the headset. Again, I had a friend who
> wrassled with this last summer, only to discover the auto function on
> his radio was fighting the headset. He shut the function off, and all
> was fine with the tower.
>
>
> Finally: a Pirep from a friend who has owned a Lightspeed ZULU for 3
> months. He loves it. Very light, very quiet, and it has an MP3 jack
> feeding his player into it, with auto volume reduction during all
> incoming/outgoing radio calls. It also accepts bluetooth from a player
> or phone. I'm buying one to greatly simplify my audio plans!
>
> Good luck,
>
> John
>
> Time: 05:38:15 PM PST US
> From: "H. M. Haught Jr. "
> Subject: Re: AeroElectric-List: Why can't the tower hear me?
>
>
> Steve -
>
> This is strange! I fly into KOUN regularly. When I fly in, I'm
> communicating with flight following with no problems, and transfer
> off
> to KOUN okay. The next day, sitting on the ramp, radio cold, they
> tell
> me that my radio is unreadable. I've had the radio checked out
> throughly by two different radio shops now 4 times. Now it is
> starting
> to happen at another airport KSAG. Yet, I taxi across the field at
> KASG, the radio shop does a check, call up tower, and everything is
> normal. Makes no sense and I think something is wrong with THEIR
> radios. And no, it isn't wind noise. I've tried everything, even my
> handheld, and at KOUN, they say they cannot understand it either,
> although at KASG, the handheld usually works. I keep telling them
> that
> they have something wrong with their system, which has now made me
> almost persona non grata at their facility. I'm using an ICOM
> radio and
> have had absolutely no problems with anyone else reading me other
> than
> those two places, and was all over California, Texas, New Mexico, and
> Arizona with it last December and January, with no problems
> whatsoever.
> I use flight following on every flight, and occasionally someone will
> tell me my radio has some background noise, but I've gotten in the
> habit
> of asking for radio checks and always get a good report. The only
> places I have problems is KOUN and KASG, and usually only on initial
> call up. Once I'm airborne, they can generally hear me fine.
>
> I'd say we have a similar problem - let's stay in touch until we find
> some way to resolve it.
>
> M. Haught
>
> Steve Ruse wrote:
> >
> >
> > I fly an open cockpit experimental (Pietenpol). My radio is a
> Vertex
> > Standard VXA-150 (handheld), powered by an external 8AH/12v
> battery.
> > I have an antenna mounted on a ground plane on the belly, in
> front of
> > the gear. I have no problems communicating air to air with other
> > planes, I have actually maintained contact air-air with friends at
> > distances over 125NM. My calls were reported as loud and clear. I
> > was based at a class D airport (KFTW) for about one year, and never
> > had trouble with the tower there.
> >
> > Two years ago, I moved to a new area, near a class D airport that I
> > occasionally go to (KOUN in Norman, OK). I often have trouble being
> > understood by the tower, even though all pilots indicate that my
> > transmissions are loud and clear. Last weekend I tried to enter the
> > class D, but both times I called, the tower responded saying
> that my
> > transmissions were "scratchy and unintelligable". I was about 6NM
> > away and could actually see the tower. I immediately switched to
> > another frequency, and heard traffic on the CTAF at KGYI, about
> 95NM
> > away. I called them and asked for a radio check. That pilot replied
> > that I was loud and clear. Not wanting to bother the tower or cause
> > trouble in their airspace, I turned away before entering.
> >
> > I am baffled by this. What would cause me to be unintelligable
> to the
> > KOUN tower repeatedly, when no one else has trouble
> understanding me,
> > even at long distances? I was on a heading for the tower, and I
> know
> > my transmission strength in that direction (forward) is good.
> AND it
> > was only six miles away.
> >
> > My only theory is that the tower doesn't like the wind noise in my
> > mic...but I have a noise cancelling mic, with a leather
> wind-blocking
> > mic cover, AND other pilots report my transmissions as clear.
> >
> > Any thoughts on what might cause this would be appreciated. It is
> > difficult to trouble shoot because I have to bother the tower to
> > replicate the problem.
> >
> > Steve Ruse
>
>
> "I have sworn upon the altar of God, eternal hostility against every
> form of tyranny over the mind of man."
> -- /Thomas Jefferson/
>
> *
>
>
> *
Message 4
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| Subject: | Motor sizing study |
The motor sizing document is up to revision -C- at:
http://tinyurl.com/yp4kx9
Bob . . .
|-----------------------------------------------------|
| "There is a great difference between knowing and |
| understanding: you can know a lot about something |
| and not really understand it" |
| -Charles F Kettering |
|-----------------------------------------------------|
Message 5
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| Subject: | Re: Boeing 767 speeds (was External antennas) |
>Re: Re: Boeing 767 speeds (was External antennas)
Matt and Mike, you are both right, thanks for keeping
me honest.
Where I'm are coming from is the KISS principle, antenna
drag is small even on a fast homebuilt, relevant to the
effort and the performance, especially on a metal plane.
Also there's nothing like a good external 1/4 wave dipole.
Fiberglass plane? Have at it. Personally when I "Race", I
take the Com antenna off and connect it to a temp internal
antenna in the cockpit. When I had a VOR antenna, I
took that off as well. So I can be picky about a few drag
clicks, but for daily flying, not so much. 1/4th of a mph
is not going to make much of a difference. Also running
extra coax around, cost weight, money and radio perf.
Cheers, thanks guys, fly safe.
---------------------------------
Never miss a thing. Make Yahoo your homepage.
Message 6
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| Subject: | Re: Tefzel dielectric strength |
rampil wrote:
>
> OK Bob,
>
> Just remember that the human optical receiver system uses a log-sensitive
> scale, so even a doubling of intensity (double the number of photons)
> would be imperceptible. It would probably be easier to just measure the voltage
spike on scope with the appropriate probe (admittedly not as much
> fun)
>
> --------
> Ira N224XS
And if you can't see the difference, why not go 'lighter'?
It would be advisable for builders to remember the same thing when they
get all over stimulated by the thought of going from a 50W halogen to a
75W halogen for their landing lights, etc etc etc.
Charlie
:-)
Message 7
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| Subject: | Re: Motor sizing study (oops!) |
At 10:34 AM 2/16/2008 -0600, you wrote:
><nuckolls.beaver@cox.net>
>
>The motor sizing document is up to revision -C- at:
>
>http://tinyurl.com/yp4kx9
>
>
> Bob . . .
This was a posting intended for another list-server (I
juggling three different ones right now. The document
cited is for a client and not intended for general
public access. I've changed the link parameters on
the server to keep this thing from getting out into
the wild in great numbers. If anyone on the list has
downloaded it, I'd appreciate it if you destroy it
and wipe the .pdf file from your HD.
Not a big deal . . . in fact, if you want to read
it for a peek through the keyhole into a product
development task, be my guest. There is no real
risk to my client's interests if we published
everything . . . but their lawyers are paid to
worry about everything . . . and demand to
have control over what's proprietary and what's
public. Given that they don't have enough helpful
things to do, the best approach is to brand everything
proprietary. Last thing I want to do is get a
lawyer upset with me!
Thanks!
Bob . . .
Message 8
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| Subject: | Re: Lights . . . how big do they really need to be? |
At 11:01 AM 2/16/2008 -0600, you wrote:
><ceengland@bellsouth.net>
>
>rampil wrote:
>>
>>OK Bob,
>>
>>Just remember that the human optical receiver system uses a log-sensitive
>>scale, so even a doubling of intensity (double the number of photons)
>>would be imperceptible. It would probably be easier to just measure the
>>voltage spike on scope with the appropriate probe (admittedly not as much
>>fun)
>>
>>--------
>>Ira N224XS
>And if you can't see the difference, why not go 'lighter'?
>
>It would be advisable for builders to remember the same thing when they
>get all over stimulated by the thought of going from a 50W halogen to a
>75W halogen for their landing lights, etc etc etc.
Absolutely! I once took a guy for a ride after dark in
the 1K1 J-3 using only a hand-held fisherman's lantern
(6v, .5A 3 watts) as an aid to landing. I let him sit in
the front seat and operate the manually retracting landing
light. We stuck it out the open door and found that it
provided plenty of light to effect graceful arrival with
the earth.
We had an adjacent lighted runway just in case but
the lantern allowed us to use the grass with no
problems.
Years ago, we had a discussion on the 'net about
landing lights for a Rotax powered Kitfox. From the
time you throttle back for approach to landing to
the time you apply full throttle for the next takeoff,
your electrical system is essentially battery-only.
A builder who was wanting to operate occasionally
from a lighted field was considering a 100W landing/
taxi light installation. I was remembering my first
night dual where the instructor never let me turn
the landing light on. After a half dozen or so touch
and goes, I began to realize that my ability to sense
height above the ground was enhanced a great deal by
the perception of texture in the surface under the
airplane that I could see every time the strobes flashed.
This brought forth the idea of mounting small 12v
halogen store spots on each wing tip and pointed
mostly down but a bit forward and outboard. The
goal was to increase the accuracy of height perception
by illuminating the surface under the wing tips and
visible in peripheral vision during the flare.
See:
http://www.aeroelectric.com/Pictures/Lighting/20W_Halogen_Spot_2.JPG
The builder installed the lights and operated them
with a push-button on the stick grip. A second set
of lights in tips pointed forward for taxi assist.
By pushing the right button only when the light was
needed reduced his energy consumption to a tiny
fraction of that needed to power up more conventional
lighting products.
Here's the cowl installation of a 55w miniature reflector
spot in a Quickie. The owner reports very satisfactory
performance after more than 5 years of service and
frequent night flights.
http://www.aeroelectric.com/Pictures/Lighting/MVC-007W.JPG
Bottom line is that the quest for klieg-light
performance in our landing/taxi/warning systems
has a diminishing return on investment after a
certain useful threshold has been reached.
Bob . . .
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