Today's Message Index:
----------------------
1. 01:20 PM - Wing-to-Fuselage electrical connections (tomcostanza)
2. 03:51 PM - Re: Wing-to-Fuselage electrical connections (ceengland@bellsouth.net)
3. 03:53 PM - Re: Wing-to-Fuselage electrical connections (Carlos Trigo)
4. 05:37 PM - Re: Wing-to-Fuselage electrical connections (Ron Quillin)
5. 05:57 PM - Routing wires point-to-point (Sam Hoskins)
6. 06:04 PM - Re: Wing-to-Fuselage electrical connections (Robert L. Nuckolls, III)
7. 06:53 PM - Re: Routing wires point-to-point (Robert L. Nuckolls, III)
8. 07:22 PM - Re: Routing wires point-to-point (Dale Rogers)
Message 1
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| Subject: | Wing-to-Fuselage electrical connections |
Gentlemen,
I'm at a point where I need to decide how to connect wires in the wing, to the
corresponding wires in the fuselage. For DC stuff, I had planned to use the wiring
connectors one often sees connecting a trailer to a truck (and as seen on
aeroelectric.com). I'm now thinking that since I will need to splice these
connectors into the wiring anyway (2 splices for each wire), I might as well just
splice the WIRES together and eliminate the connector (1 splice per wire).
But I'm using wingtip nav antennas, and I'm wondering whether to use BNC connectors
or splice the coax. I don't know which will create more of an impedance
mismatch or RF loss, but I'm thinking for a receiver, it doesn't make a whole
lot of difference. What do you think?
--------
Clear Skies,
Tom Costanza
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 9384#209384
Message 2
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| Subject: | Re: Wing-to-Fuselage electrical connections |
Message 3
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| Subject: | Wing-to-Fuselage electrical connections |
Tom
This is not an answer to your question, because I don't know it. I will be
another one to profit from the responses you will get, because I didn't make
those connections either.
By the way, you are talking about "wingtip nav antennas", how many did you
install, and which type are they?
Carlos
> -----Original Message-----
> From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-
> server@matronics.com] On Behalf Of tomcostanza
> Sent: domingo, 19 de Outubro de 2008 21:19
> To: aeroelectric-list@matronics.com
> Subject: AeroElectric-List: Wing-to-Fuselage electrical connections
>
> <Tom@CostanzaAndAssociates.com>
>
> Gentlemen,
>
> I'm at a point where I need to decide how to connect wires in the wing, to
the
> corresponding wires in the fuselage. For DC stuff, I had planned to use
the wiring
> connectors one often sees connecting a trailer to a truck (and as seen on
> aeroelectric.com). I'm now thinking that since I will need to splice
these connectors
> into the wiring anyway (2 splices for each wire), I might as well just
splice the
> WIRES together and eliminate the connector (1 splice per wire). But I'm
using
> wingtip nav antennas, and I'm wondering whether to use BNC connectors or
splice
> the coax. I don't know which will create more of an impedance mismatch or
RF
> loss, but I'm thinking for a receiver, it doesn't make a whole lot of
difference. What
> do you think?
>
> --------
> Clear Skies,
> Tom Costanza
Message 4
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| Subject: | Wing-to-Fuselage electrical connections |
At 15:52 10/19/2008, you wrote:
>But I'm using
> wingtip nav antennas, and I'm wondering whether to use BNC
> connectors or splice
> the coax. I don't know which will create more of an impedance
> mismatch or RF
> loss, but I'm thinking for a receiver, it doesn't make a whole lot
> of difference. What
> do you think?
Only one mans' opinion Tom, but given the choice of "splicing" coax
or using a pair of connectors; for me it's an absolute
brainer. Connectors, by all means. Minimum signal loss due to
impedance mismatch and contiguous shield to prevent unwanted signal
ingress. And given proper connectors much simpler and faster to
reliably terminate.
Ron Q.
Message 5
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| Subject: | Routing wires point-to-point |
I am getting to route wires, aft of the firewall, and was wondering what
kind of methods guys used. The first time I did this, 20+ years ago, the
result was a spaghetti bowl.
I am thinking of hanging some loops of wire ties in various spots, then
running wires along those paths. When all the wires are in, I would secure
with the cromagnum** wire ties, rather than the more elegant lacing. It's
all hard to access and the ties are decidedly easier.
One recent post referred to wire loom. Is that easy to work with? What
about making short conduits?
Lets hear you.
Sam Hoskins
Murphysboro, IL
www.samhoskins.blogspot.com
Message 6
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| Subject: | Re: Wing-to-Fuselage electrical connections |
At 01:19 PM 10/19/2008 -0700, you wrote:
><Tom@CostanzaAndAssociates.com>
>
>Gentlemen,
>
>I'm at a point where I need to decide how to connect wires in the wing, to
>the corresponding wires in the fuselage. For DC stuff, I had planned to
>use the wiring connectors one often sees connecting a trailer to a truck
>(and as seen on aeroelectric.com). I'm now thinking that since I will
>need to splice these connectors into the wiring anyway (2 splices for each
>wire), I might as well just splice the WIRES together and eliminate the
>connector (1 splice per wire). But I'm using wingtip nav antennas, and
>I'm wondering whether to use BNC connectors or splice the coax. I don't
>know which will create more of an impedance mismatch or RF loss, but I'm
>thinking for a receiver, it doesn't make a whole lot of difference. What
>do you think?
The airplanes I fly are on average, 15+ years old.
I'll bet not a one of them has ever had the wings off.
If I were building an airplane, wings would be wired as
they are built and 10' or so pigtails left at the fuselage
end coiled up for later routing into the fuselage and
attachment to their respective destinations . . .but
with a "service loop" about 4-6" in diameter (12-18"
of slack wire) under the wing root fairing.
Should it become necessary to EVER remove the wings,
then cut wires and/or coaxes in the middle of their
service loops. When replacing the wings, permanent
splices (and mated coax cable connectors)
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Female_1.jpg
or
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Bulkhead_Female.jpg
and
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Male.jpg
are in order for re-attaching the wings and associated
wiring.
For permanent splices, these critters are certainly
an option . . .
http://aeroelectric.com/Pictures/Terminals/PIDG-Splices.jpg
these are also favored by the grey beards for
closing cut lines but leaving a service connection
behind . . .
http://aeroelectric.com/Pictures/Terminals/ksplc2.jpg
If you wanted to use one one of these style
connectors
http://aeroelectric.com/articles/wingwire/wingwire.html
you could also consider this technique for making
high-quality, permanent splices of ship's wiring
to the connector's pigtails . . .
http://aeroelectric.com/articles/Solder_Lap_Splicing/Solder_Lap_Splices.html
Inclusion of a "service loop" of excess wire at
time of original fabrication allows for a dozen or
more cut-out-and-replace operations on individual
wires over the lifetime of the airplane.
Finally, I had a chance to fiddle with these
connectors while wiring Ol' Blue (My hand-me-down
'87 Jimmy) to tow a trailer. This was the first
time I'd put my hands on this combination of
connectors:
http://www.aeroelectric.com/Pictures/Connectors/Power/Trailer_Lights_Plug.jpg
http://www.aeroelectric.com/Pictures/Connectors/Power/Trailer_Lights_Jack.jpg
This mated pair of connectors offers some interesting
design features. The male pins in the jack are solid
bifurcated brass that plug into seamless tube sockets
in the plug housing. The spring loaded lid has a retaining
dog that holds the plug engaged the jack. These are only
slightly heavier than their mil-spec counterparts and
they're a whole lot cheaper. The only disappointment was
the wire attach methodology that runs a screw thread down
against the wire strands.
I installed wires by cutting 2x long, folding the strands
back and soldering them such that they became a solid, solder
encased "plug". run the screw down against the plug nice and
tight and follow up with an encapsulation of E6000 not unlike
what we did here
http://aeroelectric.com/articles/macservo/macservo.html
to deal with those pesky little 26AWG wires on a RayAllen
actuator.
The wiring jack can probably be mounted to fuselage skin
under the wing root fairing.
Bob . . .
Message 7
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| Subject: | Re: Routing wires point-to-point |
At 07:56 PM 10/19/2008 -0500, you wrote:
>I am getting to route wires, aft of the firewall, and was wondering what
>kind of methods guys used. The first time I did this, 20+ years ago, the
>result was a spaghetti bowl.
>
>I am thinking of hanging some loops of wire ties in various spots, then
>running wires along those paths. When all the wires are in, I would
>secure with the cromagnum wire ties, rather than the more elegant
>lacing. It's all hard to access and the ties are decidedly easier.
>
>One recent post referred to wire loom. Is that easy to work with? What
>about making short conduits?
Lay out your wire routes for finished bundles. Run
some Nylaflow 1/4" tubing on little plastic wire
bundle clamps. You can get the tubing from hardware
stores and big boxes like Home Depot. It's used
to plumb up ice-makers in refrigerators . . . among
other things. The 1/4" clamps can be had from most
'real' hardware stores . . . or you can simply make up
a little band clamp out of tin-can metal. These are
temporary. Install the clamps at the same attach points
that you plan to use for finished bundle supports.
Use bond studs, nutplates, etc.
Lay your 'real' wire bundles up along side these
Nylaflow road markers. Get a wad of el-chesso tie
wraps from Harbor Freight to hold each new wire into
place cutting off ties underneath new wires as they
become surplus.
After your bundles are all finished. cut out segments
of Nylaflow and Replace throwaway ties with good tie
wraps or string ties. Replace your temporary bundle
support clamps with the real ones.
This technique allows you to set the wire-way for
bundles that are many strands from self-supporting.
This allows you to apply finishing restraints in an
orderly cutting the forms away as you go after the
bundles are completely finished.
You can also use heavy copper wire #10AWG solid
ground wire is generally stiff enough. You may find
other materials that will do as well.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 8
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| Subject: | Re: Routing wires point-to-point |
Robert L. Nuckolls, III wrote:
> <nuckolls.bob@cox.net>
>
> Lay out your wire routes for finished bundles. Run
> some Nylaflow 1/4" tubing on little plastic wire
> bundle clamps. You can get the tubing from hardware
> stores and big boxes like Home Depot. It's used
> to plumb up ice-makers in refrigerators . . . among
> other things. The 1/4" clamps can be had from most
> 'real' hardware stores . . . or you can simply make up
> a little band clamp out of tin-can metal. These are
> temporary. Install the clamps at the same attach points
> that you plan to use for finished bundle supports.
> Use bond studs, nutplates, etc.
>
> Lay your 'real' wire bundles up along side these
> Nylaflow road markers. Get a wad of el-chesso tie
> wraps from Harbor Freight to hold each new wire into
> place cutting off ties underneath new wires as they
> become surplus.
>
> After your bundles are all finished. cut out segments
> of Nylaflow and Replace throwaway ties with good tie
> wraps or string ties. Replace your temporary bundle
> support clamps with the real ones.
>
> This technique allows you to set the wire-way for
> bundles that are many strands from self-supporting.
> This allows you to apply finishing restraints in an
> orderly cutting the forms away as you go after the
> bundles are completely finished.
>
> You can also use heavy copper wire #10AWG solid
> ground wire is generally stiff enough. You may find
> other materials that will do as well.
>
It might be worth noting that the new self-sticking (double-
sided) velcro strips make excellent temporary, reusable
bundle ties. When done with the wiring, replace them with
one's preferred permanent ties, and reuse the temps on the
next bundle being assembled. And they are easily available
from your friendly local H.D. aviation supply store.
(Home Depot)
Dale R.
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