A lot of people were turned off Tefzel insulated mil-spec wire because
they had only seen it with white insulation. Single conductor is
available at Spruce and elsewhere in many colours/stripes and AWG sizes.
Shielded wire in various conductor numbers and sizes is only available
with white outer insulation.
Aircraft wiring should use crimp connections, as that's supposed to be
more reliable. But (this may have caused the initial post) a friend's
new motorglider was found to have a bad crimp as delivered from the
factory.
Either a solder or crimp joint can be done badly, and by the time
solder melts you already have problems.
Jim
------ Original Message ------
From: "Ian Mc Phee" <[email protected]>
To: "Discussion of issues relating to Soaring in Australia."
<[email protected]>
Sent: 3/6/2017 2:44:13 AM
Subject: [Aus-soaring] Fwd: Re: Voltage drop
I meant to say since the crash on TWA flight 800 off New York and
Swissair flight 111 off Canada think 1996 both caused by wiring issues
all passenger aircraft in world were rewired with quality Aviation wire
with different voltage wires bundled separately and all non flammable
insulation. A huge leap forward in airline safety.
Simple - use the same in your glider.
Ian McPhee
0428847642
Box 657 Byron Bay NSW 2481
PS thanks Gary and Bernard for comments.
---------- Forwarded message ----------
From: "Future Aviation Pty. Ltd." <[email protected]>
Date: 6 Mar 2017 7:20 am
Subject: Re: [Aus-soaring] Voltage drop
To: "Discussion of issues relating to Soaring in Australia."
<[email protected]>
Cc:
Thanks, Ian - a very useful contribution!
Kind regards
Bernard
On 5 Mar 2017, at 10:58 pm, Ian Mc Phee <[email protected]> wrote:
I like 18gauge aviation wire for single seaters and prefer 16gauge
for 2 seaters so guess rear fin battery may need 14gauge.. Fuse
quality can also cause voltage drop and in rare occasions switches.
With 3 batteries I like a C&K 7211 switch which you can call ON ON ON
a 3 position switch.
Personally I would look for 0.2 volts maybe 0.3 volts drop when
transmit between volts at battery and volts at instrument panel. A
few years ago there was a German factory wired glider had 1volt drop
between battery and panel and it had its battery at the base of the
panel so very short wire run. The owner was shocked
Re aerial wire I like RG400 rather than the more usual RG58 but it is
expensive. Regretfully when a glider gets a broken back on several
occasions the coax is stretched considerably. . The coax is repaired
but the SWR is not checked
Ian McPhee
0428847642 <tel:0428%20847%20642>
Box 657 Byron Bay NSW 2481
On 5 Mar 2017 1:13 pm, "Mike Borgelt"
<[email protected]
<mailto:[email protected]>> wrote:
Well you can size the wiring properly by referring to the tables in
AC43.
Nobody here seems to know what reference the German glider
manufacturers use, if any. Bernard could presumably just ask
Schleichers.
In any case, just measure at the battery terminals and at the
instrument with the same load. As Bob Dircks says, there can be
drop in switches, connectors and fuses.
In any case what matters operationally is what voltage appears at
the instrument because that is what will stop it working when it
gets too low. So I'd just set the offset to zero.
I've seen too many dodgy wiring installations. If you have to wiggle
the connector to get it to work it is no good and probably won't
work for long.
In one memorable instance about 20 years ago a club had some vario
problems. After investigating they found 12 volts at the battery and
8 volts at the instrument.
After re-wiring they let me know that everything now worked fine,
including the radio which hadn't been working properly SINCE THE
FIRE DOWN THE BACK 18 MONTHS BEFORE.
Mike
At 11:38 AM 3/5/2017, you wrote:
naturally the germans involved would...ask a silly question, even a
rhetoric one.
On 5 Mar 2017, at 11:58 AM, Mike Borgelt <
[email protected]
<mailto:[email protected]>> wrote:
Refer to AC43 but measure anyway.
Who knows what the German glider manufacturers do with wiring.
Mike
At 10:52 AM 3/5/2017, you wrote:
Hi Bob
Many thanks for your quick reply.
I realise that the size of the wiring comes into it but I was
working on the assumption that
the electronic specialists amongst us would know what wiring the
manufacturers usually
use for this applications.
BTW, I’m not blaming the wiring, I just need to arrive at a
realistic figure for the offset in
my LX 9000.
Kind regards
Bernard
On 5 Mar 2017, at 11:11 am, Bob Dircks <[email protected]>
wrote:
In order to calculate the voltage drop, we would need to know
the exact conductor size of the wiring.
Of course the circuit is actually going to be 22m in length.
You can (fairly) easily measure the voltage drop with a
voltmeter, to measure the voltage at both locations while the
load is applied.
Normally one would not expect a significant drop at 0.9 A over
11m of a wire chosen carefully for the job.
However, all joints in the wiring, including switches and
breakers need to be considered, before blaming the wiring.
Bob Dircks
On Sun, Mar 5, 2017 at 11:32 AM, Future Aviation Pty. Ltd.
<[email protected] > wrote: Good morning all
Today I have a question for the electronic specialists on this
forum.
My new ASH 30 Mi has approx. 11m of electrical cable between the
avionics battery in the top of the fin and the front instrument
panel. What voltage drop can be expected at the panel if the
combined avionics draw approx. 900 mA?
This information would be helpful to properly adjust the voltage
offset in the LX 9000.
Many thanks in advance for your help and assistance.
Bernard
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