Today's Message Index:
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1. 02:21 AM - Re: If you really want a avionics switch - do it this way (JOHN TIPTON)
2. 04:09 AM - Re: Re: If you really want a avionics switch - do it this way (Sebastien)
3. 08:33 AM - Re: Re: If you really want a avionics switch - do it this way (Robert L. Nuckolls, III)
4. 12:03 PM - Can anyone explain this antennae to me? (Jacob Balmer)
5. 12:16 PM - Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (gfb)
6. 12:26 PM - Re: Can anyone explain this antennae to me? (Rene)
7. 12:26 PM - Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (gfb)
8. 12:59 PM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Kent or Jackie Ashton)
9. 01:25 PM - Re: Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (Kent or Jackie Ashton)
10. 03:11 PM - Re: Review request for RV-9 Electrical System (G3X, GTN, etc) (user9253)
Message 1
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| Subject: | Re: If you really want a avionics switch - do it this |
way
Hi Bob
I know what you are saying about single point of failure, but a two pole swtich,
with both sides failing, I fly a forty plus year old C172 (keeps me current
while I build the RV) has switches which are very 'wobbly' and I presume they
are original, but still doing their job - A good MS (Hamilton) switch should have
some longevity built in I hope
Regards: John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457111#457111
Message 2
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| Subject: | Re: If you really want a avionics switch - do it |
this way
Hi John
I have seen many of these good switches fail mechanically in commercial aircraft.
Don't forget that any of the switches in that 172 that had manufacturing defects
and died early were replaced after they failed.
Sebastien
> On Jun 14, 2016, at 05:19, JOHN TIPTON <jmtipton@btopenworld.com> wrote:
>
>
> Hi Bob
>
> I know what you are saying about single point of failure, but a two pole swtich,
with both sides failing, I fly a forty plus year old C172 (keeps me current
while I build the RV) has switches which are very 'wobbly' and I presume they
are original, but still doing their job - A good MS (Hamilton) switch should
have some longevity built in I hope
>
> Regards: John
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457111#457111
>
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: If you really want a avionics switch - do |
it this way
At 04:19 AM 6/14/2016, you wrote:
><jmtipton@btopenworld.com>
>
>Hi Bob
>
>I know what you are saying about single point of failure, but a two
>pole swtich, with both sides failing, I fly a forty plus year old
>C172 (keeps me current while I build the RV) has switches which are
>very 'wobbly' and I presume they are original, but still doing their
>job - A good MS (Hamilton) switch should have some longevity built in I hope
'hope' is the operative word. my FMEA teachers schooled
their practitioners, insofar as possible, to
convert hope into a certainty. The FAA's FARS tended
to agree.
Bob . . .
Message 4
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| Subject: | Can anyone explain this antennae to me? |
What have I got here, can anyone tell me?
Found inside a Rans S7.
Continuity between BNC jacket and antennae wand, and
Continuity between coax center wire and brass nut.
--
J. George Balmer 867-334-3555 www.YukonFlying.com
Message 5
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| Subject: | Re: Review request for RV-9 Electrical System (G3X, |
GTN, etc)
OK, I think I see your point on not needing breakers and going with fuses but I'm
not 100% there yet. For my personal sense of comfort I'd like to have items
on the endurance bus on breakers. Does this seem like a reasonable compromise?
It allows me to load-shed even further by pulling breakers if needed and uses
much fewer breakers and panel space. Thoughts?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457134#457134
Message 6
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| Subject: | Can anyone explain this antennae to me? |
I know nothing...
But I would guess a comm. Antenna.
Do not archive.....
Rene'
801-721-6080
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Jacob Balmer
Sent: Tuesday, June 14, 2016 1:02 PM
Subject: AeroElectric-List: Can anyone explain this antennae to me?
What have I got here, can anyone tell me?
Found inside a Rans S7.
Continuity between BNC jacket and antennae wand, and Continuity between coax center
wire and brass nut.
--
J. George Balmer 867-334-3555 www.YukonFlying.com
Message 7
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| Subject: | Re: Review request for RV-9 Electrical System (G3X, |
GTN, etc)
Does the rest of the circuit seem reasonable?
Could you elaborate on the e-bus switch vs relay? Up to what amperage is it ok
for it to be a regular switch? I was planning on using the S700 Carling switches
sold by b&c and they claim 15A VAC but a quick search for them seems to bring
up more failure posts than details on the switches. Is there a better option?
For the fuse blocks I'm looking at the ones sold by b&c and they come in different
sizes. Does it make sense to have 2 or 3 to split up the load a bit? Where
should they feed from? i.e. should I have one large wire for the firewall passthrough
and then split that up somewhere between the fuse blocks?
Thanks!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457135#457135
Message 8
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| Subject: | Re: Review request for RV-9 Electrical System (G3X, |
GTN, etc)
A breaker pops from too much amperage being drawn. Is it just a transient phenomena?
Likely not. If wires are shorting, it will happen again. Why risk resetting?
It will do no good. I have 700 hours on my experimental with fuses.
They have never popped unless I was fiddling with circuits and shorted something.
I do have electronic ignitions on breakers but I have never needed the
breakers.
Use what is cheap and simple. :-)
An essential bus ought to be a load-shedded bus anyway so you shouldnt have to
pull additional breakers to shed load.
-Kent
> On Jun 14, 2016, at 3:14 PM, gfb <fly@bappos.com> wrote:
>
>
> OK, I think I see your point on not needing breakers and going with fuses but
I'm not 100% there yet. For my personal sense of comfort I'd like to have items
on the endurance bus on breakers. Does this seem like a reasonable compromise?
It allows me to load-shed even further by pulling breakers if needed and uses
much fewer breakers and panel space. Thoughts?
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457134#457134
>
>
>
>
>
>
>
>
>
>
Message 9
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| Subject: | Re: Review request for RV-9 Electrical System (G3X, |
GTN, etc)
> On Jun 14, 2016, at 3:24 PM, gfb <fly@bappos.com> wrote:
>
>
> Does the rest of the circuit seem reasonable?
>
> Could you elaborate on the e-bus switch vs relay? Up to what amperage is it ok
for it to be a regular switch? I was planning on using the S700 Carling switches
sold by b&c and they claim 15A VAC but a quick search for them seems to bring
up more failure posts than details on the switches. Is there a better option?
>
If your e-bus is only a radio and other low-amp stuff, a toggle switch will do.
> For the fuse blocks I'm looking at the ones sold by b&c and they come in different
sizes. Does it make sense to have 2 or 3 to split up the load a bit? Where
should they feed from? i.e. should I have one large wire for the firewall passthrough
and then split that up somewhere between the fuse blocks?
I have made a main bus-and-essential bus setup two ways. (1) By using a 12+ fuse
Bussman fuse block with a diode feeding a 6-fuse Bussman block (the 6 position
becomes the essential bus and can be independently powered via a toggle switch
off the battery), or (2) cutting the central conductor in a large Bussman
fuse block, soldering a tab onto the opposite end, then using a diode to from
the main side to power the essential side. Again, the essential side can receive
power from the battery via a toggle switch under emergency conditions.
Thanks to Bob for these ideas. :-)
-Kent
>
> Thanks!
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=457135#457135
>
>
>
>
>
>
>
>
>
>
Message 10
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| Subject: | Re: Review request for RV-9 Electrical System (G3X, |
GTN, etc)
One advantage of relays is remote control. The relay can be located close to the
battery. In the event of smoke in the cockpit or an imminent forced landing,
power can be shut off at the source without having hot wires entering the cockpit.
Switch the negative side of the relay like the battery contactor.
I can not remember the brand, but their switches used rivets to conduct electrons
from inside of the housing to the outside. The problem was that the plastic
case was part of the sandwich that the rivet held together. The plastic flowed
over time which allowed the rivets to loosen. That led to resistance and
heat and failure.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457144#457144
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