Today's Message Index:
----------------------
1. 05:34 AM - Weight savings (Gary Casey)
2. 05:59 AM - Re: Alarm System (Steve Thomas)
3. 07:32 AM - Re: Weight savings (echristley@nc.rr.com)
4. 07:36 AM - Re: Alarm System (Ron Koyich)
5. 07:38 AM - Re: Alarm System (echristley@nc.rr.com)
6. 08:29 AM - Re: Weight savings (Matt Prather)
7. 08:29 AM - Re: Instrument light dimming (Eric M. Jones)
8. 09:39 AM - Re: Re: Instrument light dimming (Richard Tasker)
9. 09:49 AM - GTX-327 Wiring Diagram (F1Rocket@comcast.net)
10. 11:04 AM - Re: Instrument light dimming (James Foerster)
11. 11:13 AM - Re: GTX-327 Wiring Diagram (Mark Steitle)
12. 11:17 AM - Re: Alarm System (Traveling Man)
13. 12:02 PM - Re: GTX-327 Wiring Diagram (Mark Steitle)
14. 12:04 PM - Re: Re: Alarm System (Mark Steitle)
15. 01:34 PM - Re: Re: Alarm System (echristley@nc.rr.com)
16. 01:39 PM - Re: Re: Instrument light dimming (John Schroeder)
17. 01:47 PM - Re: Weight savings (echristley@nc.rr.com)
18. 02:18 PM - Fw: Z-12 Main Alternator Control (Richard Sipp)
19. 03:40 PM - Re: Weight savings (BobsV35B@aol.com)
20. 06:01 PM - Re: Alarm System (jerb)
21. 08:26 PM - Re: Alarm System (Troy Scott)
22. 08:37 PM - Re: Re: Weight of RG142 (Robert L. Nuckolls, III)
23. 09:02 PM - Re: Alarm System (Richard E. Tasker)
24. 09:26 PM - Re: Alarm System (BTomm)
25. 10:57 PM - Re: Re: Instrument light dimming (Brian Lloyd)
Message 1
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--> AeroElectric-List message posted by: "Gary Casey" <glcasey@adelphia.net>
I'll add my bit to the discussion. The other comments were very
appropriate, but here is how I calculated it: My current airplane is worth
about $60,000 and carries about 600 pounds. $100 per pound. I don't carry
all 600 pounds very often, but when I do an extra pound would be valuable.
The important thing is that once you set a value use the discipline to stick
to it. I've set it at $100 and so far have paid for things that cost
$50/pound, like throwing away all the nylon locknuts that came with the kit
and buying all-metal locking nuts - average of $48/pound.
One of our customers related that for a military aircraft project they were
giving an incentive of $1,000/pound. For cars I've heard of $1/pound. I
think anything from $50 on up would make sense. Just don't do what some of
the OEM's do and worry about the airframe for hours, but when the time comes
to add the last 10% of the stuff they seem to figure "oh, well, what's an
extra pound?" Just from the few things they buy from us they could save
maybe a pound for very little effort, but they don't seem to be interested.
Gary Casey
Message 2
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: Steve Thomas <lists@stevet.net>
Hello Rob,
Monday, May 17, 2004, 5:43:13 PM, you wrote:
RH> Put the noise INSIDE the cockpit, preferably a system capable of putting out
RH> at least 80dB - more is better - of continuous sound
And then, what happens when it goes off while doing an instrument
approach to minimums?
--
Best regards,
Steve
Message 3
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| Subject: | Re: Weight savings |
--> AeroElectric-List message posted by: echristley@nc.rr.com
----- Original Message -----
From: Gary Casey <glcasey@adelphia.net>
Subject: AeroElectric-List: Weight savings
> --> AeroElectric-List message posted by: "Gary Casey"
> <glcasey@adelphia.net>
> I'll add my bit to the discussion. The other
comments were very
> appropriate, but here is how I calculated it: My
current airplane
> is worth
> about $60,000 and carries about 600 pounds. $100
per pound. I
> don't carry
> all 600 pounds very often, but when I do an extra
pound would be
> valuable.
I like the way you look at it, but I don't like the
number that it gives me. My best guesstimate is
that my project will end up around $20K, and I'm
aiming for $15. The useful load is around 1100lb.
That comes out to only $18/lb. I just KNOW that I'm
willing to pay more than that. A certified ship
bought new with the same capacity would sell for
somewhere around $350K. That come out to around
$320/lb.
Message 4
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--> AeroElectric-List message posted by: "Ron Koyich" <Ron@Koyich.com>
>>And then, what happens when it goes off while doing an instrument
approach to minimums?<<
Focus, Man!
Message 5
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: echristley@nc.rr.com
> RH> Put the noise INSIDE the cockpit, preferably a
system capable
> of putting out
> RH> at least 80dB - more is better - of
continuous sound
>
>
> And then, what happens when it goes off while
doing an instrument
> approach to minimums?
>
> --
Full power to gain some altitude, then pull the damn
fuse out and put it back in your pocket where it
belongs!! 8*)
How about a cut-off switch in the gear legs?
Message 6
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| Subject: | Re: Weight savings |
--> AeroElectric-List message posted by: "Matt Prather" <mprather@spro.net>
Does $20K include paying yourself for your labor? If you buy a
certified ship, labor is included...
Regards,
Matt-
N34RD
> --> AeroElectric-List message posted by: echristley@nc.rr.com
>
snip
>> valuable.
>
> I like the way you look at it, but I don't like the
> number that it gives me. My best guesstimate is
> that my project will end up around $20K, and I'm
> aiming for $15. The useful load is around 1100lb.
> That comes out to only $18/lb. I just KNOW that I'm
> willing to pay more than that. A certified ship
> bought new with the same capacity would sell for
> somewhere around $350K. That come out to around
> $320/lb.
>
Message 7
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| Subject: | Re: Instrument light dimming |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
> From: James Redmon (james@berkut13.com)
>Date: Mon May 17 - 12:39 PM
> --> AeroElectric-List message posted by: "James Redmon"
<james@berkut13.com>
>the backup 2 1/4" AS and ALT instruments are
> powered by the "add-on" glow strip rings that are powered by a DC-AC
>inverter. The inverter is hooked up to the same panel dimmer and it
does
>dim...but not nearly enough. They are still way-to-bright for night
ops,
>while some radio lights are at about zero illumination.
>The question is, how can I achieve additional dimming on those
instruments
>without sacrificing too much full-bright range? I can stand a little
>degradation, but not too much as the blue/green light makes them
stand-out
>from under the long canopy cover.
Electroluminescent lights are driven by a little inverter ( a circuit that
inputs DC and outputs AC). The light strip itself tests electrically to be a
capacitor. The frequency of this AC can be changed for dimming but it is
tricky. Some displays are pulse width modulated--also tricky. The inverter
output voltage can be changed, but might be tricky unless the inverted is
made for it.
The easy way is probably to put a resistor in series with one of the leads
and see what happens. This should lead to a solution. A capacitor in series
would work too but is harder to make variable.
Regards,
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge MA 01550-2705
Phone (508) 764-2072
Email: emjones@charter.net
Message 8
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| Subject: | Re: Instrument light dimming |
--> AeroElectric-List message posted by: Richard Tasker <retasker@optonline.net>
The EL strips with inverter I have dim just fine with reductions in
voltage. I suspect the problem is that incandescent lights dim rather
nonlinearly and go to essentially invisibility well above zero volts,
while the EL strips are more linear - leaving them with a significant
light output when the incandescents have dimmed to nothing.
I don't have a really good simple solution other than using two dimmers
- one for the incandescents and one for the EL strips.
If I had the problem I would probably design something that reduced the
EL supply voltage faster than the incandescent supply voltage - but
then, I am an electrical design engineer and the circuit would probably
be too complicated :-) .
Dick Tasker
Eric M. Jones wrote:
>--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
>
>
> > From: James Redmon (james@berkut13.com)
> >Date: Mon May 17 - 12:39 PM
>
> > --> AeroElectric-List message posted by: "James Redmon"
><james@berkut13.com>
>
> >the backup 2 1/4" AS and ALT instruments are
> > powered by the "add-on" glow strip rings that are powered by a DC-AC
> >inverter. The inverter is hooked up to the same panel dimmer and it
>does
> >dim...but not nearly enough. They are still way-to-bright for night
>ops,
> >while some radio lights are at about zero illumination.
>
> >The question is, how can I achieve additional dimming on those
>instruments
> >without sacrificing too much full-bright range? I can stand a little
> >degradation, but not too much as the blue/green light makes them
>stand-out
> >from under the long canopy cover.
>
> Electroluminescent lights are driven by a little inverter ( a circuit that
>inputs DC and outputs AC). The light strip itself tests electrically to be a
>capacitor. The frequency of this AC can be changed for dimming but it is
>tricky. Some displays are pulse width modulated--also tricky. The inverter
>output voltage can be changed, but might be tricky unless the inverted is
>made for it.
>
>The easy way is probably to put a resistor in series with one of the leads
>and see what happens. This should lead to a solution. A capacitor in series
>would work too but is harder to make variable.
>
> Regards,
>Eric M. Jones
>www.PerihelionDesign.com
>113 Brentwood Drive
>Southbridge MA 01550-2705
>Phone (508) 764-2072
>Email: emjones@charter.net
>
>
Message 9
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| Subject: | GTX-327 Wiring Diagram |
3.6 ALT_MED Misspelled medication name
--> AeroElectric-List message posted by: F1Rocket@comcast.net
Anyone have a wiring diagram for the Garmin GTX-327 transponder? I hate the way
Garmin protects these things like their top secret or something.
Thanks.
Randy
F1 Rocket
http://f1rocket.home.comcast.net
Message 10
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| Subject: | Re: Instrument light dimming |
--> AeroElectric-List message posted by: "James Foerster" <jmfpublic@comcast.net>
James and Eric,
I had planned on using electroluminescent (EL) strips for lighting, and bought
parts from All Electronics which included a 12 inch by 1 inch EL strip($6) and
an inverter ($3 or $4) I did try the resistor in series with the inverter, and
it worked to some extent. I used fixed resistors to experiment. You could
do the same, find the biggest resistor that still lets your inverter start and
drive the two EL lights, and then find a 2 or 5 watt rheostat of the same value
as your biggest fixed resistor. Measure current so that you can calculate
needed wattage. Your particular inverter will determine the load and dimming
range of this setup.
To have a one knob solution, you could use a light controlled resistor in series
with the inverter. For example, the CAT# PRE-19 from All Electronics, is a
1" by 0.85" photocell which is 20 ohms with full illumination going to 5000 ohms
in the dark. This would need to dissipate some power, so bonding to a small
heat sink or to the metal mounting for your switch panel might work. You would
enclose this with a light bulb powered by your dimmer, and as the light from
the bulb fell, the photocell would increase its resistance. The amount of
experimenting to get this to track the incandescent bulbs might not be worth
it for a one-off project, though.
Changing frequency from the inverter is an elegant solution, but the color of the
light will change as well as the intensity. Since the eye does not see color
in low light, this is not a problem for instrument lighting. Using an NE555
as the waveform source would be easy, but again it would take more building
and experimentation than a one-off project warrants.
Ultimately, I decided not to use the EL strips, but rather use LEDs. The LEDs
are more reliable in that they do not need an inverter, just a series resistor.
If you already have the EL ring lights, you will need to live with that solution.
Jim Foerster, J400 80% done, waiting for me to wire.
Message 11
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| Subject: | Re: GTX-327 Wiring Diagram |
--> AeroElectric-List message posted by: Mark Steitle <msteitle@mail.utexas.edu>
Randy,
I contacted Garmin Tech Support, explained that I was building an
experimental, and asked them to send me the install guide for the
GTX-327. They replied with the following document.
Mark S.
At 04:46 PM 5/18/2004 +0000, you wrote:
>--> AeroElectric-List message posted by: F1Rocket@comcast.net
>
>Anyone have a wiring diagram for the Garmin GTX-327 transponder? I hate
>the way Garmin protects these things like their top secret or something.
>
>Thanks.
>
>Randy
>F1 Rocket
>http://f1rocket.home.comcast.net
>
>
Message 12
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: "Traveling Man" <travliman58@hotmail.com>
The battery running dead is a problem motorcyclists who have alarms on their
rides have to deal with. (Small batteries, longish times of not being
used/recharged. I would suggest looking into a system for a motorcycle. If
it is going to be a long time between recharges, and since any system will
maintain a small current draw, look into a solar powered recharging system.
I personally like the idea of a VERY loud alarm inside the cockpit, but you
should have some failsafe way of turning it off.
Below is a link to one site that offers alarms for motorcycles, good luck.
http://shop.vendio.com/evan2002/category/6069/
Bob Lindley
Learn to simplify your finances and your life in Streamline Your Life from
Message 13
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| Subject: | Re: GTX-327 Wiring Diagram |
--> AeroElectric-List message posted by: Mark Steitle <msteitle@mail.utexas.edu>
Randy,
Referenced doc was stripped in my reply. So, I sent it directly to you.
Mark S.
At 01:08 PM 5/18/2004 -0500, you wrote:
>--> AeroElectric-List message posted by: Mark Steitle
><msteitle@mail.utexas.edu>
>
>Randy,
>I contacted Garmin Tech Support, explained that I was building an
>experimental, and asked them to send me the install guide for the
>GTX-327. They replied with the following document.
>
>Mark S.
>
>
>At 04:46 PM 5/18/2004 +0000, you wrote:
> >--> AeroElectric-List message posted by: F1Rocket@comcast.net
> >
> >Anyone have a wiring diagram for the Garmin GTX-327 transponder? I hate
> >the way Garmin protects these things like their top secret or something.
> >
> >Thanks.
> >
> >Randy
> >F1 Rocket
> >http://f1rocket.home.comcast.net
> >
> >
>
>
Message 14
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: Mark Steitle <msteitle@mail.utexas.edu>
>
>I personally like the idea of a VERY loud alarm inside the cockpit,
How about tying the alarm system to the Wig-Wag landing lights. One thing
a thief doesn't want is attention.
Mark S.
Message 15
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: echristley@nc.rr.com
----- Original Message -----
From: Mark Steitle <msteitle@mail.utexas.edu>
Subject: Re: AeroElectric-List: Re: Alarm System
> --> AeroElectric-List message posted by: Mark Steitle
> <msteitle@mail.utexas.edu>
>
> >
> >I personally like the idea of a VERY loud alarm
inside the cockpit,
>
Just thought of something that might be a gotcha.
Crook in court tells the judge that his hearing got
ruined while trying to steal your radios. In a just
world, the judge would award the crook $1 for his
pain and suffering. In this world it might cost us
our plane and our house.
Message 16
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| Subject: | Re: Instrument light dimming |
--> AeroElectric-List message posted by: John Schroeder <jschroeder@perigee.net>
Eric -
You recommend a resistor inserted in one of the leads. Since you did nor
specify which one I assume that it is in either lead from the inverter to
the lamp. If this is not the case, it would go in the power (+) lead from
the dimmer to the inverter. Am I correct, or demonstrating some ignorance
about the effect of resistance in an AC circuit?
Thanks,
John
> The easy way is probably to put a resistor in series with one of the
> leads and see what happens. This should lead to a solution. A capacitor
> in series would work too but is harder to make variable.
>
> Regards,
> Eric M. Jones
Message 17
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| Subject: | Re: Weight savings |
--> AeroElectric-List message posted by: echristley@nc.rr.com
----- Original Message -----
From: Matt Prather <mprather@spro.net>
Subject: Re: AeroElectric-List: Weight savings
> --> AeroElectric-List message posted by: "Matt
Prather"
> <mprather@spro.net>
> Does $20K include paying yourself for your labor?
If you buy a
> certified ship, labor is included...
>
> Regards,
>
> Matt-
> N34RD
>
> > --> AeroElectric-List message posted by:
echristley@nc.rr.com
> >
>
> snip
>
> >> valuable.
> >
> > I like the way you look at it, but I don't like the
> > number that it gives me. My best guesstimate is
> > that my project will end up around $20K, and I'm
> > aiming for $15. The useful load is around 1100lb.
> > That comes out to only $18/lb. I just KNOW that I'm
> > willing to pay more than that. A certified ship
> > bought new with the same capacity would sell for
> > somewhere around $350K. That come out to around
> > $320/lb.
> >
Good point, Matt.
Congress' justification of experimental aircraft is
supposed to be education (funny how the feds can
strip our rights and then hand them back when THEY
find a justification, ain't it). I figure I'm doing
as much work and learning just as much as someone
pursuing a doctorate degree. Donating 4 years of
labor to a local university will cost more in
tuition and books than what I'll have in materials.
I won't get presented with a fancy certificate full
of nice swirly letters, or wear a long dress twice a
year without my brothers laughing at me, but I will
have an airplane (which I'd much rather have anyway).
So, by this reckoning, my plane is free!!
If I was already an expert builder who knew
everything he needed to know, and this wasn't my
plane...you know, the typical A&P, and I got paid
workman's wages, say $30k/yr, then I guess labor
would be about $60, all told.
That reckoning puts the total cost at around $75k,
and about $70/lb of useful load.
Message 18
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| Subject: | Fw: Z-12 Main Alternator Control |
--> AeroElectric-List message posted by: "Richard Sipp" <rsipp@earthlink.net>
Bob:
With respect to Z-12 (Single Battery, Dual Alternator) the main alternator appears
to be controlled by the main battery master switch while the aux alternator
has a separate on/off switch.
Is there a reason for not having a separate main alternator switch as well? I
plan on this system for the RV-10 I have under construction.
The aircraft is designed with a battery location aft of the passenger compartment.
With an aluminum airframe is the 4AWG ground cable to the instrument panel
ground bus still the preferred grounding method?
Many thanks.
Dick Sipp
RV10 #65
Message 19
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| Subject: | Re: Weight savings |
--> AeroElectric-List message posted by: BobsV35B@aol.com
In a message dated 5/18/04 3:49:53 PM Central Daylight Time,
echristley@nc.rr.com writes:
That reckoning puts the total cost at around $75k,
and about $70/lb of useful load
Good Evening echristle,
There is reasonable justification for using payload in
lieu of useful load. How would the numbers look if
you did that?
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Airpark LL22
Downers Grove, IL 60516
630 985-8502
Message 20
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: jerb <ulflyer@verizon.net>
Actually an auto alarm might offer more than you realize. Any insurance
company would rather pay up for a $2000 repair than $10K-15K for
replacement of the avionics plus the hack repair. It could be set up to
power the strobes and landing light for drawing attention along with the
normal audio. (Note, most alarms will shut off after a period of time to
prevent running down the battery - some periodically repeat the warning
alert. Could even be on its own battery system with a relay to activate
the strobe and landing lights with a wigwag flasher.) Could even have the
higher tech microwave proximity alarm to discourage them to move on to
another target before they forcefully enter. Alarm cost $, avionics $$$$
and the insurance company might grant a premium reduction for the
alarm. At many isolated fields, there is often someone around its just
nothing attracts their attention for you to know it.
jerb
At 04:09 PM 5/17/04 -0500, you wrote:
>--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
><bob.nuckolls@cox.net>
>
>At 02:04 PM 5/17/2004 -0400, you wrote:
> >--> AeroElectric-List message posted by: "Jim Stone" <jrstone@insightbb.com>
> >
> >Hey Chuck,
> >What avionics did you install, and what is your exact address?
> >JHSF,
> >Jim
> >----- Original Message -----
> >From: "Chuck Jensen" <cjensen@dts9000.com>
> >To: <aeroelectric-list@matronics.com>
> >Subject: AeroElectric-List: Alarm System
> >
> >
> > > --> AeroElectric-List message posted by: Chuck Jensen
> ><cjensen@dts9000.com>
> > >
> > > Is there an alarm system available for exp. aircraft that has been used.
> >I
> > > have a keyed door but, having just installed avionics that has the
> > > equivalent value of the GNP of a developing nation, I'd like to give
> > > potential thieves a better run for their money than some winky door lock.
> > > An audible alarm and potentially activation of strobe and canard flashers
> > > would seem to be a minimu. I assume some "good" solutions have been
> >worked
> > > out but didn't find it in the archives. Ideas?
>
>
> How is your airplane to be stored? We had a tie-down tenant
> on our airport relate his own experience with stolen radios:
>
> Seems his C-182 was parked on a relatively unsecured field
> (like ours at 1K1) and someone decided to take advantage of
> the situation and removed all the radios from his airplane.
> To get at the radios, he put a crowbar into the gap between
> trailing edge of door and doorpost to pry it open. In addition
> to getting the radios, damage to the aircraft was about $2,000.
>
> Some years later, his airplane was entered while parked on
> an away field. A flight bag with hand-helds and other pilot's
> tools were stolen. The insurance company initially balked at
> the claim, "You didn't lock the airplane." The guy sent
> a copy of the repair bill for the door on the earlier
> event and suggested that locking the door would not have
> prevented anyone from getting into the airplane . . . and
> would only increase the size of the claim. They paid the
> claim with no further protest.
>
> Bottom line is, what do you REALLY expect any barrier between
> thief and valuables to accomplish? Locks only keep honest people
> honest . . . if someone wants the stuff in your airplane,
> fragile barriers are only an inconvenience.
>
> You might be better off locking a hangar door (the most
> robust barrier) and leaving the airplane unlocked. Once
> the thief is inside the hangar, the question is not whether
> or not he walks away with your stuff, it's a question of
> total cost to put things right. New canopy? Lots of chop-n-hack
> on your sheet metal with doublers inside at the joints where
> buggered sheet metal was cut out?
>
> Many folks who parked airplanes on 1K1 didn't lock doors . . .
> for exactly the reason cited above. Given the number of
> car alarms that annoy the populace-at-large, I'm not
> sure I'd put much faith in the value of making some ADDITIONAL
> noise when a thief hammers a hole in your windshield.
>
> Bob . . .
>
>
Message 21
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: "Troy Scott" <tscott1217@bellsouth.net>
WRT alarms, I think it would be great to rig a nerve gas system that would
assure the thief would still be by the plane when the police arrive.
Regards,
Troy
Message 22
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| Subject: | Re: Weight of RG142 |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <bob.nuckolls@cox.net>
<snip>
> >A couple weeks ago there was a lister who thought my Super-2-CCA copper clad
> >aluminum FatWire (available in two weeks) was too expensive for the weight
> >saved. I honestly don't know how best to calculate such a thing. I once flew
> >from Van Nuys, Ca to Winslow, Az in a Cessna150 and landed with a pound of
> >usable fuel remaining. I would have paid plenty for that pound of fuel
> >instead of a extra pound of wire.
> >
> >Regards,
> >Eric M. Jones
>
>
> Excellent points. I can reinforce those ideas with the following
> anecdotes from my own experience. In 1964 when I was a tech writer
> for Cessna, a number commonly circulated around the
> engineering department suggested "For every pound of emptly weight
> added to our airplanes, it will cost the owner(s) of that airplane
> $100 to buy the pound of stuff, maintain it, and purchase fuel
> to carry it around over the lifetime of the airplane.
<snip>
Hmmmm . . . I wondered where this post went. When it didn't show
up on the list for several hours after I sent it, I repeated the
post. Now the errant message pops up several days later . . . ain't
electronics wundurful?
Bob . . .
Message 23
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| Subject: | Re: Alarm System |
--> AeroElectric-List message posted by: "Richard E. Tasker" <retasker@optonline.net>
I agree, but unfortunately with the current legal system you would be
the one going to jail - even if the thief was only temporarily
"inconvenienced".
Dick Tasker
Troy Scott wrote:
>--> AeroElectric-List message posted by: "Troy Scott" <tscott1217@bellsouth.net>
>
>WRT alarms, I think it would be great to rig a nerve gas system that would
>assure the thief would still be by the plane when the police arrive.
>
>Regards,
>Troy
>
>
>
>
Message 24
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--> AeroElectric-List message posted by: BTomm <fvalarm@rapidnet.net>
Someone makes a smoke system for use with alarm systems which produces very
dense theatrical smoke on demand to cloak the area. This has a number of
effects. It frightens the intruder who doesn't understand what's happening
(it will completely fill a 20 X 20 room in seconds (I don't remember for
sure but much less than 1 minute). Can you spell Claustrophobia...? It
blocks almost all light preventing theft because what you can't see you
can't steal. The intruder will have a difficult time finding the door if
he allows the smoke to envelop him. It's quite disorienting. It is tough
to disable because it works fast and by nature renders the intruder blind.
You get the picture. Again it needs to be positively disabled before
flight. It "should" be safe for radios and instruments because it's
intended for use in computer rooms.
Bevan
RV7A fuse
On Wednesday, May 19, 2004 8:20 PM, Troy Scott
[SMTP:tscott1217@bellsouth.net] wrote:
> --> AeroElectric-List message posted by: "Troy Scott"
<tscott1217@bellsouth.net>
>
> WRT alarms, I think it would be great to rig a nerve gas system that
would
> assure the thief would still be by the plane when the police arrive.
>
> Regards,
> Troy
>
>
>
>
>
>
>
>
>
Message 25
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| Subject: | Re: Instrument light dimming |
--> AeroElectric-List message posted by: Brian Lloyd <brianl@lloyd.com>
Richard Tasker wrote:
> The EL strips with inverter I have dim just fine with reductions in
> voltage. I suspect the problem is that incandescent lights dim rather
> nonlinearly and go to essentially invisibility well above zero volts,
> while the EL strips are more linear - leaving them with a significant
> light output when the incandescents have dimmed to nothing.
>
> I don't have a really good simple solution other than using two dimmers
> - one for the incandescents and one for the EL strips.
This sounds like a job for a cheap micrprocessor like a PIC with a couple of D:A
converters. You can program the D:A converters to drive a power op-amp that
drives the various lights. You can then tailor the transfer curve any way you
want.
--
Brian Lloyd 6501 Red Hook Plaza
brianl@lloyd.com Suite 201
http://www.lloyd.com St. Thomas, VI 00802
+1.340.998.9447 (voice) +1.360.838.9669 (fax)
There is a time to laud one's country and a time to protest.
A good citizen is prepared to do either as the need arises.
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