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In rush limiters

 
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dean.psiropoulos(at)veriz
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PostPosted: Fri Mar 10, 2006 11:43 pm    Post subject: In rush limiters Reply with quote

I'm looking at the in-rush limiters that you recommend installing in the
landing light circuit Bob. These look like the old mica capacitors you used
to see in tube televisions. I have a bit of trepidation about how to mount
these securely and make a secure connection to the landing light wiring.
Any suggestions here? Solder and heat shrink in line with the wire seems a
bit flimsy and floppy to me, what would you recommend?

Anyone else on the list using in-rush limiters? How did you mount them and
what are your experiences so far?

Also I have an aluminum aircraft (RV-6A) and plan to ground the landing,
taxi and position lights locally on the spar at the wingtip. From your
comments and your book it doesn't sound like this will be a problem if I
make good solid gas-tight connections. Any additional words of wisdom here?
Thanks.

Dean Psiropoulos
RV-6A N197DM
Autocad tweaks & load analysis.


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nuckollsr(at)cox.net
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PostPosted: Sat Mar 11, 2006 9:27 am    Post subject: In rush limiters Reply with quote

At 02:29 AM 3/11/2006 -0500, you wrote:

Quote:

<dean.psiropoulos(at)verizon.net>

I'm looking at the in-rush limiters that you recommend installing in the
landing light circuit Bob. These look like the old mica capacitors you used
to see in tube televisions. I have a bit of trepidation about how to mount
these securely and make a secure connection to the landing light wiring.
Any suggestions here? Solder and heat shrink in line with the wire seems a
bit flimsy and floppy to me, what would you recommend?

Anyone else on the list using in-rush limiters? How did you mount them and
what are your experiences so far?

Also I have an aluminum aircraft (RV-6A) and plan to ground the landing,
taxi and position lights locally on the spar at the wingtip. From your
comments and your book it doesn't sound like this will be a problem if I
make good solid gas-tight connections. Any additional words of wisdom here?
Thanks.

On Digikey catalog page:

http://dkc3.digikey.com/PDF/T061/1327.pdf

we find this data:

http://www.aeroelectric.com/Mfgr_Data/Fuses_and_Current_Limiters/GE_Sensors/GE_Inrush_Limiters.jpg

These used to be the Keystone Carbon Co. products and have been
around for a long time. I used them on the GP-180 taxi and recognition
lights. The first time experimental techs turned on the taxi light
with a KC003 limiter in series, the thing 'blew up'. Seems he mounted
the limiter to the inside surface of the taxi light fixture on the landing
gear. It was held down with a very robust clamp worthy of installation on
the nose gear of an aircraft. The mounting sinked out so much heat that
the device wasn't allowed to warm up to its very low resistance, low
wattage 'hot' mode so it self-destructed.

I bought some Fiberglas sleeving (actually door gasket material
for wood burning stoves) and we fabricated a mechanically robust
but thermally isolated mounting for the KC003. Worked just fine after
that. Inrush on the lamp dropped from 60+ down to about 10A.

Pick a limiter with a max steady state current equal to or as much
as 1/3 higher than your operating current. Wrap it up in some
thermally appropriate materials to clamp it for support. You're correct,
the solid copper lead wires are not looked upon with favor in
aircraft fabrication techniques. I'd cut them of to about 1/4", then make
little loops for soldering 22759 leadwires.
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 >


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