Today's Message Index:
----------------------
1. 04:52 AM - Re: Request review of Electrical Load Analysis - using Z13/8 a (plevyakh)
2. 06:59 AM - model airplane servo (user9253)
3. 07:32 AM - Re: model airplane servo (Mike Welch)
4. 08:24 AM - Re: model airplane servo (Bob McCallum)
5. 08:47 AM - Re: model airplane servo (Bill Schertz)
6. 09:02 AM - Re: model airplane servo (Robert L. Nuckolls, III)
7. 09:25 AM - Re: model airplane servo (Richard Tasker)
8. 09:27 AM - Re: Request review of Electrical Load Analysis - using Z13/8 a (Tundra10)
9. 10:06 AM - Re: model airplane servo (Vern Little)
10. 11:11 AM - Re: model airplane servo (Robert L. Nuckolls, III)
11. 03:25 PM - Re: model airplane servo (Charlie England)
12. 04:03 PM - Re: model airplane servo (Robert L. Nuckolls, III)
13. 05:32 PM - Re: model airplane servo (Charlie England)
14. 05:47 PM - Re: Request review of Electrical Load Analysis - using Z13/8 ar (Speedy11@aol.com)
15. 08:44 PM - Transponder antenna signal (Speedy11@aol.com)
16. 09:42 PM - Re: Transponder antenna signal (Don)
17. 11:14 PM - Doug Garner & Autopilots (The Kuffels)
18. 11:24 PM - Re: Transponder antenna signal (The Kuffels)
Message 1
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Subject: | Re: Request review of Electrical Load Analysis - using |
Z13/8 a
> "nuckolls.bob(at)aeroelect"]At 06:48 AM 1/13/2011, you wrote:
> Really that high? ...... The last detail load analysis I did on a small airplane
some years ago showed a max CONTINUOUS demand of 27 amps for the worst case
flight condition (IFR, pitot heat ON)....
Bob,
You have me thinking my scenario estimates are wrong. In my sheet I estimate Pitot
heat (8amps), Strobe (7amps), and Navigation / Position lights (8amps) totaling
23amps just for that alone.
I've checked with a few other builders that have similar equipment and they all
told me they had to upgrade to a 60amp alternator....and that 40amp wouldn't
do it.
I did talk with Whelen engineering yesterday and I can get my Nav/Position lights
down to 1.0 amps by switching to an LED setup. But I'm stuck with high loads
for the pitot heat and strobes.
I need some help with a paradigm shift on how I'm estimating these loads.
I'm looking at your form and for IFR cruise I would still think I'd need to assume
Pitot heat, Strobe, and Nav/Position lights as continuous loads if I were
flying in the soup on a cold wet day. I'd appreciate a reality check from the
list on this assumption.
I'll try to rework my numbers using the flight condition approach and see how I
fit using the 25% reserve factor. Thx.
Howard
--------
Howard Plevyak
GlaStar
North Bend, Ohio
hplevyak@mac.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=326997#326997
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Subject: | model airplane servo |
I want to install electric aileron trim. I could buy a Ray Allen servo and control
its speed with PWM. I was wondering if there are any other options that
might be lighter weight or smaller. Has anyone had experience with linear actuators
or model airplane R/C servos? Do the RC model servos hold their position
when power is removed? The ideal 12vdc servo would be slow moving and would
be operated by a switch without electronic controls. It should also have built-in
limit switches and a position feedback pot. Maybe the Ray Allen is the
best.
Thanks, Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327009#327009
Message 3
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Subject: | model airplane servo |
>Has anyone had experience with linear actuators or model airplane R/C serv
os?
> Joe Gores
Hi Joe=2C
A couple of years ago=2C I considered doing the same thing you are referr
ing to=2C
using an RC model servo for a full sized airplane. I checked them out=2C t
here are a
LOT of them=2C and they are usually graded by how much "pull or push" they
can
generate. If my memory is correct=2C I think I can remember something lik
e "32 grams" as
the biggest version=2C or at least a 'near' biggest version.. I did some m
ore looking
around=2C but I don't remember if I ever found out what the RC Allen servo'
s rating was.=2C
....but after I weighed the option of trying experiment (yet again!!)=2C I
decided to go with the
RAC servo=2C and frankly=2C I'm glad I did!
It was made precisely for my intended use=2C so no experimentation necess
ary=2C and they
even come with little clevis forks=2C and matching pins=2C and the kind of
stuff you'd
expect to find on such a devise.
I suppose if a guy looked long enough=2C he may be able to find a servo t
hat rates
higher than 32 gms=2C but even still=2C I'd think he'd still be better off
with the RAC servo.
That's not to say it can't be done=2C but I think you may be installing som
ething that MAY
not be up to the task.
Mike Welch
Message 4
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Subject: | model airplane servo |
Joe;
It does have all of those features and that is specifically its purpose, so
it would be a logical choice. Any of the other options you mention would
likely require adaptation and you would have to do the experimentation and
reliability research already done for you by Ray Allen. In my humble opinion
I would suggest you've reached the correct conclusion when you said "Maybe
the Ray Allen is the best".
Bob McC
---Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of user9253
> Sent: Friday, January 14, 2011 9:57 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: model airplane servo
>
<fran4sew@banyanol.com>
>
> I want to install electric aileron trim. I could buy a Ray Allen servo
and control its
> speed with PWM. I was wondering if there are any other options that might
be lighter
> weight or smaller. Has anyone had experience with linear actuators or
model airplane
> R/C servos? Do the RC model servos hold their position when power is
removed? The
> ideal 12vdc servo would be slow moving and would be operated by a switch
without
> electronic controls. It should also have built-in limit switches and a
position feedback
> pot. Maybe the Ray Allen is the best.
> Thanks, Joe
>
> --------
> Joe Gores
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=327009#327009
>
>
>
>
>
>
>
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
>
>
Message 5
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Subject: | Re: model airplane servo |
Check out http://www.periheliondesign.com/moreproducts.htm for a controller
for Futaba, etc servos. Also has trim wheels, etc.
Bill Schertz
KIS Cruiser #4045
N343BS
-----Original Message-----
From: Bob McCallum
Sent: Friday, January 14, 2011 10:19 AM
Subject: RE: AeroElectric-List: model airplane servo
<robert.mccallum2@sympatico.ca>
Joe;
It does have all of those features and that is specifically its purpose, so
it would be a logical choice. Any of the other options you mention would
likely require adaptation and you would have to do the experimentation and
reliability research already done for you by Ray Allen. In my humble opinion
I would suggest you've reached the correct conclusion when you said "Maybe
the Ray Allen is the best".
Bob McC
---Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of user9253
> Sent: Friday, January 14, 2011 9:57 AM
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: model airplane servo
>
<fran4sew@banyanol.com>
>
> I want to install electric aileron trim. I could buy a Ray Allen servo
and control its
> speed with PWM. I was wondering if there are any other options that might
be lighter
> weight or smaller. Has anyone had experience with linear actuators or
model airplane
> R/C servos? Do the RC model servos hold their position when power is
removed? The
> ideal 12vdc servo would be slow moving and would be operated by a switch
without
> electronic controls. It should also have built-in limit switches and a
position feedback
> pot. Maybe the Ray Allen is the best.
> Thanks, Joe
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=327009#327009
>
>
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
> _-
> ====================================================
> ======
>
>
Message 6
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Subject: | Re: model airplane servo |
At 09:56 AM 1/14/2011, you wrote:
>
>I want to install electric aileron trim. I could buy a Ray Allen
>servo and control its speed with PWM. I was wondering if there are
>any other options that might be lighter weight or smaller. Has
>anyone had experience with linear actuators or model airplane R/C
>servos? Do the RC model servos hold their position when power is
>removed? The ideal 12vdc servo would be slow moving and would be
>operated by a switch without electronic controls. It should also
>have built-in limit switches and a position feedback pot. Maybe the
>Ray Allen is the best.
I have a skunk-werks bin with about a dozen
RC actuators that were used in various remote
control situations over the years.
These are short throw (short rotation) devices
with output shafts designed to move control
surfaces with a bellcrank. I have some about the
size of a postage stamp that cost about $10 up
to puppies like this:
http://www.gpdealera.com/cgi-bin/wgainf100p.pgm?I=FUTM0216
for about $100.
They're spur-geared and do not LOCK position
when turned off. Linear actuators like the
RC Allen will not back-drive when powered down.
Further, they're a bit user unfriendly as stock
actuators. They run on 4.5 to 7.0 volts. The
position command signal is a variable duty
cycle pulse. Easy to control out of a microprocessor
(or r/c receiver) not to easy from the pilot's
seat.
I've used these as rudimentary motor-gearbox
assemblies. You can remove the stops, pot
and electronics. The rudimentary assembly
can then drive a lead-screw to provide a LOT
of force over long distances.
I guess the short answer to your question is
no. But they DO offer some interesting opportunities
for a variety of remote control tasks if
you've got the interest and energy to stroke 'em.
Bob . . .
Message 7
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Subject: | Re: model airplane servo |
While the RC servos do hold their position with power off, it is not
quite locked. You can move them with some force. Whether the ailerons
would apply enough force to do so is a question unanswered.
I would suggest you stick with the proven solution even though it is
somewhat pricey compared to an RC servo. You can change the speed with
PWM or if you want a true servo based on the Ray Allen design, see the
same page listed below for an add-on..
Dick Tasker
Bill Schertz wrote:
> <wschertz@comcast.net>
>
> Check out http://www.periheliondesign.com/moreproducts.htm for a
> controller for Futaba, etc servos. Also has trim wheels, etc.
>
>
> Bill Schertz
> KIS Cruiser #4045
> N343BS
>
> -----Original Message----- From: Bob McCallum
> Sent: Friday, January 14, 2011 10:19 AM
> To: aeroelectric-list@matronics.com
> Subject: RE: AeroElectric-List: model airplane servo
>
> <robert.mccallum2@sympatico.ca>
>
> Joe;
>
> It does have all of those features and that is specifically its
> purpose, so
> it would be a logical choice. Any of the other options you mention would
> likely require adaptation and you would have to do the experimentation
> and
> reliability research already done for you by Ray Allen. In my humble
> opinion
> I would suggest you've reached the correct conclusion when you said
> "Maybe
> the Ray Allen is the best".
>
> Bob McC
>
>
> ---Original Message-----
>> From: owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-
>> server@matronics.com] On Behalf Of user9253
>> Sent: Friday, January 14, 2011 9:57 AM
>> To: aeroelectric-list@matronics.com
>> Subject: AeroElectric-List: model airplane servo
>>
> <fran4sew@banyanol.com>
>>
>> I want to install electric aileron trim. I could buy a Ray Allen servo
> and control its
>> speed with PWM. I was wondering if there are any other options that
>> might
> be lighter
>> weight or smaller. Has anyone had experience with linear actuators or
> model airplane
>> R/C servos? Do the RC model servos hold their position when power is
> removed? The
>> ideal 12vdc servo would be slow moving and would be operated by a switch
> without
>> electronic controls. It should also have built-in limit switches and a
> position feedback
>> pot. Maybe the Ray Allen is the best.
>> Thanks, Joe
>>
>> --------
>> Joe Gores
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=327009#327009
>>
>>
>>
>>
>>
>>
>>
>> _-
>> ====================================================
>> ======
>> _-
>> ====================================================
>> ======
>> _-
>> ====================================================
>> ======
>> _-
>> ====================================================
>> ======
>>
>>
>
>
Message 8
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Subject: | Re: Request review of Electrical Load Analysis - using |
Z13/8 a
With glass panels, IFR and HID wig-wag headlamps (I fly with them on all the time
to increase visibility and perhaps reduce bird strikes), even with LED position
and collision lights, I still add up to 34A continuous in cruise.
Jeff Page
Dream Aircraft Tundra #10
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=327025#327025
Attachments:
http://forums.matronics.com//files/load_analysis_onebus_a_591.pdf
Message 9
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Subject: | Re: model airplane servo |
I think these servos should be considered:
http://store.firgelli.com
I haven't used them myself, but they seem appropriate to the application.
They are located a few miles from me, so one day I should go visit and give
a PIREP.
Vern Little
-----Original Message-----
From: Robert L. Nuckolls, III
Sent: Friday, January 14, 2011 7:59 AM
Subject: Re: AeroElectric-List: model airplane servo
<nuckolls.bob@aeroelectric.com>
At 09:56 AM 1/14/2011, you wrote:
>
>I want to install electric aileron trim. I could buy a Ray Allen
>servo and control its speed with PWM. I was wondering if there are
>any other options that might be lighter weight or smaller. Has
>anyone had experience with linear actuators or model airplane R/C
>servos? Do the RC model servos hold their position when power is
>removed? The ideal 12vdc servo would be slow moving and would be
>operated by a switch without electronic controls. It should also
>have built-in limit switches and a position feedback pot. Maybe the
>Ray Allen is the best.
I have a skunk-werks bin with about a dozen
RC actuators that were used in various remote
control situations over the years.
These are short throw (short rotation) devices
with output shafts designed to move control
surfaces with a bellcrank. I have some about the
size of a postage stamp that cost about $10 up
to puppies like this:
http://www.gpdealera.com/cgi-bin/wgainf100p.pgm?I=FUTM0216
for about $100.
They're spur-geared and do not LOCK position
when turned off. Linear actuators like the
RC Allen will not back-drive when powered down.
Further, they're a bit user unfriendly as stock
actuators. They run on 4.5 to 7.0 volts. The
position command signal is a variable duty
cycle pulse. Easy to control out of a microprocessor
(or r/c receiver) not to easy from the pilot's
seat.
I've used these as rudimentary motor-gearbox
assemblies. You can remove the stops, pot
and electronics. The rudimentary assembly
can then drive a lead-screw to provide a LOT
of force over long distances.
I guess the short answer to your question is
no. But they DO offer some interesting opportunities
for a variety of remote control tasks if
you've got the interest and energy to stroke 'em.
Bob . . .
Checked by AVG - www.avg.com
19:34:00
Message 10
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Subject: | Re: model airplane servo |
At 01:03 PM 1/14/2011, you wrote:
><sprocket@vx-aviation.com>
>
>I think these servos should be considered:
>
>http://store.firgelli.com
>
>I haven't used them myself, but they seem appropriate to the
>application. They are located a few miles from me, so one day I
>should go visit and give a PIREP.
These look interesting . . . especially since
they're offered with built in servo electronics
to integrate into a variety of voltages and
control protocols (including R/C variable
pulse width). They DO report a back-driving
force value but it's probably very high
compared to working loads. It would be
interesting to know what lead-screw
configuration they are using.
Bob . . .
Message 11
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Subject: | Re: model airplane servo |
On 1/14/2011 8:56 AM, user9253 wrote:
> --> AeroElectric-List message posted by: "user9253"<fran4sew@banyanol.com>
>
> I want to install electric aileron trim. I could buy a Ray Allen servo and control
its speed with PWM. I was wondering if there are any other options that
might be lighter weight or smaller. Has anyone had experience with linear actuators
or model airplane R/C servos? Do the RC model servos hold their position
when power is removed? The ideal 12vdc servo would be slow moving and would
be operated by a switch without electronic controls. It should also have
built-in limit switches and a position feedback pot. Maybe the Ray Allen is the
best.
> Thanks, Joe
>
> --------
> Joe Gores
Hi Joe,
My 1st homebuilt was a (purchased) Thorp T-18 that had a homebuilt
autopilot (wing leveler) and aileron trim system using a trim tab on one
aileron. It used a standard model a/c servo, just like what you're
probably thinking about. The autopilot used an ingenious
pneumatic/thermal rate sensor as its heart. A stream of air moving
between two thermal sensors made up the rate sensor. The system had roll
trim that used a generic potentiometer to drive the servo controller.
The autopilot section wasn't functional when I bought the plane (it had
been stored for about 5 years before I bought it), but the trim feature
worked just fine for the short time I owned the plane. Failure modes
were never explored by me, because it just worked.
If you're handy with electronics and the application of tools to small
projects, I can't see why you can't add a worm drive to the servo if it
would make you feel more comfortable. Or, you could just do flutter
testing on a trim tab type system with power removed from the servo
(which you'll need to do anyway, if you add any kind of trim tab to the
aileron). It's not likely that you would have any luck mounting the trim
tab on the wing tip itself (it's been tried by others; there just isn't
enough aerodynamic authority unless the tab is almost as big as the
aileron).
BTW, a neighbor has a homebuilt that has the same autopilot design as my
Thorp, but with the addition of a homebuilt magnetic heading source that
allowed the autopilot to actually follow a magnetic heading.
Compared to the 'oldtimers', we young 50-60 year-old 'experimenters' are
just delivery guys for Ikea. :-)
Charlie
Message 12
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Subject: | Re: model airplane servo |
>ust isn't enough aerodynamic authority unless the tab is almost as
>big as the aileron).
>
>BTW, a neighbor has a homebuilt that has the same autopilot design
>as my Thorp, but with the addition of a homebuilt magnetic heading
>source that allowed the autopilot to actually follow a magnetic heading.
>
>Compared to the 'oldtimers', we young 50-60 year-old 'experimenters'
>are just delivery guys for Ikea. :-)
Charlie,
The system you've described sounds like a DIY system designed
conceived by a NASA engineer named Doug Garner. I think it was
written up in several issues of Sport Aviation circa 1980.
Doug developed a home brew rate sensor based on a small speaker
huffing on a venturi to produce a steady stream of air between
two de-bulbed lamps used as hot-wire anemometers. He also crafted
a flux gate compass for magnetic heading hold. Very clever stuff.
I met him briefly at OSH about 1986 or so. The autopilot brains
was an 8-bit micro-controller.
Today we have solid state rate sensors, silicon magnetometers
and GPS serial data to effect VERY precise course hold. Of
course, the R/C servos have become still more robust and many
feature all metal gear trains. I think I've got copies of
his articles buried somewhere. I ought to scan them and
put them up on the website as historical data.
Bob . . .
Message 13
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Subject: | Re: model airplane servo |
On 1/14/2011 4:59 PM, Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
>
>> ust isn't enough aerodynamic authority unless the tab is almost as
>> big as the aileron).
>>
>> BTW, a neighbor has a homebuilt that has the same autopilot design as
>> my Thorp, but with the addition of a homebuilt magnetic heading
>> source that allowed the autopilot to actually follow a magnetic heading.
>>
>> Compared to the 'oldtimers', we young 50-60 year-old 'experimenters'
>> are just delivery guys for Ikea. :-)
>
> Charlie,
>
> The system you've described sounds like a DIY system designed
> conceived by a NASA engineer named Doug Garner. I think it was
> written up in several issues of Sport Aviation circa 1980.
> Doug developed a home brew rate sensor based on a small speaker
> huffing on a venturi to produce a steady stream of air between
> two de-bulbed lamps used as hot-wire anemometers. He also crafted
> a flux gate compass for magnetic heading hold. Very clever stuff.
> I met him briefly at OSH about 1986 or so. The autopilot brains
> was an 8-bit micro-controller.
>
> Today we have solid state rate sensors, silicon magnetometers
> and GPS serial data to effect VERY precise course hold. Of
> course, the R/C servos have become still more robust and many
> feature all metal gear trains. I think I've got copies of
> his articles buried somewhere. I ought to scan them and
> put them up on the website as historical data.
>
>
> Bob . . .
I think you're right about the source; I have read the articles. I have
the schematics & wiring diagrams somewhere; if I stumble upon them I'll
scan & forward. I even have the 'heart' of the hardware somewhere; I'll
try to send some pics of that, too. IIRC, the rate sensor was built into
a coffee can. :-) I'm certainly not advocating a return that
technology; I was just trying to point out how little real experimenting
we really do these days.
Charlie
Message 14
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Subject: | Re: Request review of Electrical Load Analysis - using |
Z13/8 ar
Howard,
I'm surprised your anticipated load is going to be so high. My IFR RV-8A
only uses about 32A with everything on. I use the 60A Plane Power Alt and
it is loafing.
If you are recommending LEDs to be used for landing lights, I'd suggest
builders consider HID instead. I have both on my airplane and, as much as I
like them, the LEDs are not yet up to the task of landing light. They are
great for radiance, but do not illuminate well. The power and optics are
just not quite sufficient. I use the LEDs for taxi and recognition lights.
They wig wag much better than HIDs and light up using a square wave which
makes them visible and discernable at long distance.
The HIDs, although expensive, are excellent for landing illumination.
Regards,
Stan Sutterfield
_www.rv-8a.net_ (http://www.rv-8a.net)
Thanks I'll add those items. I'm going to go without the cooling fan
initially
and see how the avionics fare. I might have to add later.
For those planning IFR w/ similar equipment....it looks like the LC-60 amp
alternator
is a must due to the high current consumption of the pitot heat,
navigation,
strobe, and landing lights.
For anyone who has not yet purchased equipment you'll want to buy LED
style, and
maybe the Gretz Aero pitot heat system to keep the amps down.
I'm going to switch to the B&C LC-60 amp alternator and plan for a max
continuous
electrical load of 80-85% or 48 to 51 amps.
Howard
--------
Howard Plevyak
GlaStar
Message 15
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Subject: | Transponder antenna signal |
Bob - or other antenna gurus,
I want to streamline my transponder antenna. I have the short (3 inch)
stub antenna with the ball on the tip. To streamline it I'm going to make an
epoxy resin fiberglass covering that will look like a blade antenna.
Please confirm for me that streamlining with a fiberglass covering will not
affect signal performance.
Thanks,
Stan Sutterfield
Message 16
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Subject: | Transponder antenna signal |
Stan,
Can't answer your question but check out this site for a streamlined
antenna. www.deltapopaviation.com
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Speedy11@aol.com
Sent: Friday, January 14, 2011 8:41 PM
Subject: AeroElectric-List: Transponder antenna signal
Bob - or other antenna gurus,
I want to streamline my transponder antenna. I have the short (3 inch) stub
antenna with the ball on the tip. To streamline it I'm going to make an
epoxy resin fiberglass covering that will look like a blade antenna.
Please confirm for me that streamlining with a fiberglass covering will not
affect signal performance.
Thanks,
Stan Sutterfield
Message 17
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Subject: | Doug Garner & Autopilots |
Off Topic, Do Not Archive
Bob,
Had the distinct honor of collaborating with Dr. Garner (Humble Tinkerer) on
a few very minor parts of his electro-fluidic autopilots. He was taken
aback when he got a phone call (no email in 1974) from this guy in Alaska
asking about some construction details from his original technical paper
(NASA TN D-7460). Even weirder, we had a common interest in the fluidics
work done at the US Army Harry Diamond Laboratory. He provided the special
material and lots of encouragement needed to get my first example working.
I had a devil of a time trying to get the prototype of my improved version
of the toroidal core magnetometer working until I realized it was sitting on
my workbench surface... just above a drawer full of steel tools. Duh.
A few remarks:
<< system designed conceived by a NASA engineer named Doug Garner. I think
it was written up in several issues of Sport Aviation circa 1980. >>
Try Sport Aviation for Mar 74, June 78, Aug 80, Nov 81 & Dec 81. Only the
last 3 have construction details. His forum notes were much more detailed,
including printed circuit layouts.
<< Doug developed a home brew rate sensor .. a steady stream of air
between
two de-bulbed lamps used as hot-wire anemometers.>>
Most of his examples used thermistors which at $3@ were more expensive but a
lot easier to deal with than trying to remove the glass from a bulb.
<< He also crafted a flux gate compass for magnetic heading hold. Very
clever stuff. >>
Very clever indeed. He was the first to use for this application digital
division of a high frequency square wave to easily come up with the special
phase separated primary driving signals needed by this magnetometer. It was
a major simplification. Believe he/NASA got a patent on the idea.
<< The autopilot brains was an 8-bit micro-controller. >>
Actually, he never published plans for an autopilot using a
micro-controller. He did describe a digital compass (Sport Aviation Nov 86)
without details. He may have provided more information on building the
compass at one of his Oshkosh forums but nothing on a micro-controller
autopilot..
Doug is now fully retired from NASA but still lives with his wife Harlene in
Newport News, Va. If anyone wants to send him a card please tell me
off-list and I'll give you his mailing address. Sorry for the diversion
down memory lane but Doug deserves remembering. Don't get me started on
other Garner stories about fighting NASA management, steam cars, developing
rockets or his early flying (can you spell Pietenpol).
Tom Kuffel
Message 18
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Subject: | Re: Transponder antenna signal |
Stan,
<< streamline my transponder antenna... streamlining with a fiberglass
covering will not affect signal performance. >>
As long as you don't use any paint/ingredients containing metal or
carbon there shouldn't be any observable difference.
Tom Kuffel
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