Today's Message Index:
----------------------
1. 04:56 AM - Re: Secrets Techniques (Glen Matejcek)
2. 04:59 AM - Re: Twisted pair tefzel (Glen Matejcek)
3. 06:38 AM - Re: Re: Secrets Techniques (Robert L. Nuckolls, III)
4. 10:42 AM - Re: Secrets Techniques (John Loram)
5. 04:50 PM - Re: Re: Aluminum bronze - conductivity (Henador Titzoff)
6. 05:33 PM - Re: Aluminum bronze - conductivity (Eric M. Jones)
Message 1
INDEX | Back to Main INDEX |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Secrets Techniques |
Hi Bob-
WRT techniques for dealing with tefzel, Basler up in OSH comes to mind. When they
do a turbine conversion, every wire, tube, hose, and threaded fastener comes
out. It's quite process, and they build up their own harnesses right there
in their electrical loft.
Glen Matejcek
Message 2
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Twisted pair tefzel |
Will do-
>
>Time: 11:38:48 AM PST US
>From: "John Loram" <johnl@loram.org>
>Subject: RE: AeroElectric-List: Twisted pair tefzel
>
>
>Thank you Glen. What I'm hoping to find is a twisted pair of Tefzel 22 AWG
>wires inside a out sheath of Tefzel.
>
>Would you let me know, when you can, if that's what you have? thanks,
>-john-
Glen Matejcek
Message 3
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Secrets Techniques |
At 06:54 AM 5/6/2012, you wrote:
><aerobubba@earthlink.net>
>
>Hi Bob-
>
>WRT techniques for dealing with tefzel, Basler up in OSH comes to
>mind. When they do a turbine conversion, every wire, tube, hose,
>and threaded fastener comes out. It's quite process, and they build
>up their own harnesses right there in their electrical loft.
Sure. Tefzel has been the insulation of choice
in GA aircraft (and most military) since the
early 80's.
I had the electrical-avionics group on the
Gates-Piaggio GP180 program at Lear. We
were considering Tefzel for that program
and discovered it required an State
Department technology export license if
we were going to use it in airplanes
sold outside the country.
A good friend of mine was a tech-rep for
Raychem who was offering an alternative
to Tefzel in their "Spec 55" wire. I brought
in some samples and the folks on the wire
balcony were playing with it when it was
announced that Lear had acquire the necessary
export license. The changeover to Tefzel was
pretty much a foregone conclusion in all
the TC aircraft.
Tefzel (or ETFE) is a cousin to Teflon
(PTFE) and is widely used in many technologies
besides wire. See:
http://tinyurl.com/24stb9e
http://tinyurl.com/yb462g6
It's not a really big deal for stripping
except when working with thin overlays
that (1) buckle in column load when
you try to push it off (2) a braided
structure with a very strong grip
on the insulation.
Bob . . .
Message 4
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Secrets Techniques |
Yeah, I know. Just being anal.... I'll use it, thanks, -john-
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Saturday, May 05, 2012 3:42 PM
Subject: RE: AeroElectric-List: Secrets Techniques
At 01:26 PM 5/5/2012, you wrote:
I'm just looking for 15 ft of UNshielded twisted pair for the RS-422 data
lines in a Dynon D10A installation. If I can't find it, I'll just twist some
22 AWG, but would prefer to have the Tefzel casing for a little added
physical protection.
Shielded I got already. but thank you, -john-
then use it. it will be fine . . .
Bob . . .
Message 5
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Aluminum bronze - conductivity |
Eric,=0A=0AThank you for correcting me about copper plating vs. copper clad
and also for the additional information after that. I continuously run int
o people, even engineers, who think gold is the metal with best conductance
. -As you point out, gold has almost zero reactivity with the atmosphere,
which makes it ideal for connector plating (or cladding!). -It is also i
deal inside ICs for thin plating and very thin wires, because it is so duct
ile.=0A=0AI'd like to point out something, though. -Below you say that si
lver is the best conductor, followed by copper then aluminum. Gold actually
follows copper and then aluminum. What's really surprising is that calcium
follows aluminum. The reasons calcium is not widely used as a conductor ar
e reactance to the atmosphere, easy dissolution in water, and insufficient
mechanical strength.=0A-=0AHenador Titzoff=0A=0A=0A______________________
__________=0A From: Eric M. Jones <emjones@charter.net>=0ATo: aeroelectric-
list@matronics.com =0ASent: Thursday, May 3, 2012 11:17 AM=0ASubject: AeroE
lectric-List: Re: Aluminum bronze - conductivity=0A =0A--> AeroElectric-Lis
t message posted by: "Eric M. Jones" <emjones@charter.net>=0A=0A=0A> Why no
t send that puppy off to Eric at Perihelion Design to get it copper plated?
...Henador=0A=0A=0AThe copper clad aluminum I sell is not plated. This woul
dn't be good, plating always has pinholes and wears off. The Super-CCA I se
ll is "clad" which is a process where copper and aluminum are fused togethe
r. 10% of the diameter of the crossection is actually copper.- Copperweld
Inc., historically made lots of different stuff clad with copper by this p
rocess. It is important to know that there is a long history of aluminum wi
ring problems, but essentially NO HISTORY of CCA problems. The wire behaves
very much like copper=0A=0ASome notes of metals:=0A=0A1) In many applicati
ons the conductivity of the metal is less important than the surface reacti
vity with atmospheric oxygen (or in the case of- titanium only, with nitr
ogen). Impure aluminum oxide is the same as sapphire or corundum and is qui
te insulating. Copper oxide looks bad but still conducts electricity well.
Same for silver. It can turn black and conduct well. Stainless steel, nicke
l, chrome and aluminum looks great initially but turns into an insulator. T
his usually happens slowly. Battery contacts made of stainless steel were o
nce the bane of cheap electronics.=0A=0A2) See: http://aerospacedefense.tho
masnet.com/Asset/MIL-F-14072.pdf- Finishes for Ground Based Electronic Eq
uipment. There is probably an aircraft-version of this but it is all the sa
me chemistry.=0A=0A3) Gold has zero reactivity with the atmosphere. Gold is
only a fairly- good conductor but is great for low voltage electrical cont
acts. Silver is the best conductor followed by copper, then aluminum. =0A
=0A4) Aluminum has over TWICE the conductivity per unit mass of any other m
etal. So learning how to use it can save weight. The electrical power indus
try uses far more aluminum than copper outside the home. Aluminum wiring in
houses (that used electrical plugs and switches designed for copper) were
retrofitted by adding a short pigtail of copper with special grease in a wi
renut or crimp connector. =0A=0A5) Galvanic corrosion depends on the Electr
ode potential in the electro-chemical series AND presence of an electrolyte
--saltwater perhaps but water will do. If you put dissimilar metals togethe
r, but keep them air-tight and dry, there is no problem.=0A=0A--------=0AEr
ic M. Jones=0Awww.PerihelionDesign.com=0A113 Brentwood Drive=0ASouthbridge,
MA 01550=0A(508) 764-2072=0Aemjones(at)charter.net=0A=0A=0A=0A=0ARead this
topic online here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=3723
37#372337=0A=0A=0A=0A=0AAttachments: =0A=0Ahttp://forums.matronics.com//fil
===========
Message 6
INDEX | Back to Main INDEX |
PREVIOUS | Skip to PREVIOUS Message |
NEXT | Skip to NEXT Message |
LIST | Reply to LIST Regarding this Message |
SENDER | Reply to SENDER Regarding this Message |
|
Subject: | Re: Aluminum bronze - conductivity |
Henador,
Thanks. Right you are.
For elements that can be drawn into wires--Bulk Conductivity: Silver, Copper, Gold,
Aluminium. And Mass Conductivity: Aluminum, Copper, Silver, Zinc, Gold.
Eric
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=372522#372522
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|