Today's Message Index:
----------------------
1. 06:27 AM - Re: Re: Z14 with SDS EM5 ENG BUS (Robert L. Nuckolls, III)
2. 06:57 AM - Re: Dissimiliar metals (Robert L. Nuckolls, III)
3. 08:30 AM - Re: ROTAX LANE LIGHTS PROBLEM SOLVED (Eric Page)
4. 08:30 AM - Re: Re: Z14 with SDS EM5 ENG BUS (David Carter)
5. 08:38 AM - Re: Dissimiliar metals (Bernie)
6. 08:38 AM - The next generation . . . (Robert L. Nuckolls, III)
7. 09:02 AM - Re: The next generation . . . (Ernest Christley)
8. 09:10 AM - Re: ROTAX LANE LIGHTS PROBLEM SOLVED (user9253)
9. 05:21 PM - Re: Broken power terminal (Ron Burnett)
Message 1
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| Subject: | Re: Z14 with SDS EM5 ENG BUS |
>
>
>If I follow this advice, is there a way to turn off both battery
>contactors in flight for a smoke in the cockpit scenario? It seems
>the engine would need additional electical protection.
>
Yeah . . . that's why Z101 came into being. Fewer components,
robust, dual fed busses. For smoke in cockpit, close
battery feed to engine bus . . . shut down all other
switches.
Bob . . .
Message 2
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| Subject: | Re: Dissimiliar metals |
At 10:23 PM 11/5/2020, you wrote:
>
>Garmin provides stainless hardware for grounding studs for some of
>its electronics. Would stainless be a problem for attaching the
>grounding forest (brass/copper) to an aluminum airframe?
>
>Bernie Willis
Generally no problem.
Dissimilar metals have three fundamental characteristics
that manifest in not-so-obvious thermoelectric qualities.
See: https://tinyurl.com/pmare2c
For the purposes of this discussion, we're interested
in the potential for extra ordinary corrosion in the
interface of the two materials . . . corrosion that
degrades electrical conduction and perhaps promotes
structural destruction.
This risk moves forward only if there is water (or
other ionic fluid) present. The cited Seebeck effect
manifests as a tiny battery created by molecular
differences in two metals. Not a problem in a dry
condition but when conductive moisture is present,
electrons will flow through the liquid between
the two battery poles. Those electrons MUST come
from the more negative of the two poles. I.e.
that battery electrode 'rusts' due to the flow
of current external to the electrodes.
This gives rise to the sacred concept of gas-tight
connections. If the void between the potentially
antagonistic metals is reduce to zero, then
moisture and oxygen necessary to promote
atmospheric rust -AND- electrolytic rust cannot
enter and the joint is secure. The outside
surfaces might show signs of corrosion but
the parts that matter are secure in their
assembly.
Examples of these phenomenon are
illustrated by the accelerated destruction
of metals in a marine environment. I have
visited this example of extreme corrosion
on Flamenco Beach, Culebra Island, PR
https://tinyurl.com/y33t3a62
Massive volumes of metal have be completely
dissolved away into the surf.
The short answer is: Stainless hardware does
not offer risk if (1) it's not routinely
wet and (2) the conducting surface interfaces
are adequately compressed to achieve gas-tight
joints.
Bob . . .
Message 3
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| Subject: | Re: ROTAX LANE LIGHTS PROBLEM SOLVED |
user9253 wrote:
> The Rotax 912iS lane LED lights did not work in my friend's Kitfox. [SNIP]
Joe, I hope you don't mind; I re-posted your discovery to the TeamKitfox forum.
I wanted to make other Kitfox builders aware, in case the Kitfox factory sent
incorrect resistors with more than one 912is installation kit. Thanks for passing
along the information.
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499275#499275
Message 4
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| Subject: | Re: Z14 with SDS EM5 ENG BUS |
Bob - I'm implementing Z101 now as a retrofit in my RV-7A. Your response
reminded me of a question I had. Is there a reason not to operate with the
engine bus alt feed always on? And the same question for the aux alternator
field? I'm using the B&C standby regulator rather than the Ford regulator
since I had one laying around if that makes any difference.
Thanks!
David
---
David Carter
david@carter.net
On Fri, Nov 6, 2020 at 9:29 AM Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
>
>
> If I follow this advice, is there a way to turn off both battery
> contactors in flight for a smoke in the cockpit scenario? It seems the
> engine would need additional electical protection.
>
>
> Yeah . . . that's why Z101 came into being. Fewer components,
> robust, dual fed busses. For smoke in cockpit, close
> battery feed to engine bus . . . shut down all other
> switches.
>
> Bob . . .
>
Message 5
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| Subject: | Re: Dissimiliar metals |
Bob
Thank you! I=99ll leave the stainless hardware in place. But in the fu
ture is the stainless preferred over cadmium plated steel or brass?
Bernie
Sent from my iPhone
> On Nov 6, 2020, at 6:05 AM, Robert L. Nuckolls, III <nuckolls.bob@aeroelec
tric.com> wrote:
>
> =EF=BB At 10:23 PM 11/5/2020, you wrote:
.com>
>>
>> Garmin provides stainless hardware for grounding studs for some of its el
ectronics. Would stainless be a problem for attaching the grounding forest (
brass/copper) to an aluminum airframe?
>>
>> Bernie Willis
>
> Generally no problem.
>
> Dissimilar metals have three fundamental characteristics
> that manifest in not-so-obvious thermoelectric qualities.
> See: https://tinyurl.com/pmare2c
>
> For the purposes of this discussion, we're interested
> in the potential for extra ordinary corrosion in the
> interface of the two materials . . . corrosion that
> degrades electrical conduction and perhaps promotes
> structural destruction.
>
> This risk moves forward only if there is water (or
> other ionic fluid) present. The cited Seebeck effect
> manifests as a tiny battery created by molecular
> differences in two metals. Not a problem in a dry
> condition but when conductive moisture is present,
> electrons will flow through the liquid between
> the two battery poles. Those electrons MUST come
> from the more negative of the two poles. I.e.
> that battery electrode 'rusts' due to the flow
> of current external to the electrodes.
>
> This gives rise to the sacred concept of gas-tight
> connections. If the void between the potentially
> antagonistic metals is reduce to zero, then
> moisture and oxygen necessary to promote
> atmospheric rust -AND- electrolytic rust cannot
> enter and the joint is secure. The outside
> surfaces might show signs of corrosion but
> the parts that matter are secure in their
> assembly.
>
> Examples of these phenomenon are
> illustrated by the accelerated destruction
> of metals in a marine environment. I have
> visited this example of extreme corrosion
> on Flamenco Beach, Culebra Island, PR
>
> https://tinyurl.com/y33t3a62
>
> Massive volumes of metal have be completely
> dissolved away into the surf.
>
> The short answer is: Stainless hardware does
> not offer risk if (1) it's not routinely
> wet and (2) the conducting surface interfaces
> are adequately compressed to achieve gas-tight
> joints.
>
>
> Bob . . .
Message 6
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| Subject: | The next generation . . . |
Saw one of these on Banggood a few weeks ago
and had to get one to play with.
https://tinyurl.com/y3rlo8hk
At first blush, the thing seems quite capable
for making good solder joints of all sizes.
The cord is a bit 'stiff' which slightly hampers
control for tiny ECB parts. I may splice a
flexible cloth over rubber cord on it to enhance
that feature.
The Metcals are still the gold standard of soldering
irons but getting hard to find used/surplus . . . too
expensive new. My own Metcals are probably
40+ years old. When and if I need to replace one,
this new kid on the block may well fill the bill
for a whole lot less money!
In any case, these are exceedingly reasonable
for the performance offered . . . a cheap
experiment if you're interested in a
versatile soldering tool
Bob . . .
Message 7
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| Subject: | Re: The next generation . . . |
For those not familiar with Banggood:
https://www.amazon.com/Adjustable-Temperature-Controlled-Thermostatic-Elect
ronic/dp/B089SKWMPT/ref=sr_1_12?dchild=1&keywords=soldering+iron&sr
=8-12
On Friday, November 6, 2020, 11:39:39 AM EST, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
Saw one of these on Banggood a few weeks ago
and had to get one to play with.
https://tinyurl.com/y3rlo8hk
At first blush, the thing seems quite capable
for making good solder joints of all sizes.
The cord is a bit 'stiff' which slightly hampers
control for tiny ECB parts. I may splice a
flexible cloth over rubber cord on it to enhance
that feature.
The Metcals are still the gold standard of soldering
irons but getting hard to find used/surplus . . . too
expensive new. My own Metcals are probably
40+ years old. When and if I need to replace one,
this new kid on the block may well fill the bill
for a whole lot less money!
In any case, these are exceedingly reasonable
for the performance offered . . . a cheap
experiment if you're interested in a
versatile soldering tool
=C2- Bob . . .
Message 8
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| Subject: | Re: ROTAX LANE LIGHTS PROBLEM SOLVED |
Thanks Eric. My friend purchased the engine 5 years ago. Hopefully Kitfox found
and corrected the error by now.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499280#499280
Message 9
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| Subject: | Re: Broken power terminal |
Thanks. Sent in for repair.
Ron Burnett
May you have the Lord's blessings today!
Sent from my iPad
> On Nov 5, 2020, at 8:01 PM, Charlie England <ceengland7@gmail.com> wrote:
>
>
>> On 11/5/2020 7:23 PM, Ron Burnett wrote:
>>
>> I over torqued a #6 power terminal breaking most of it off on a dual unit fuel
pump. I did get the ring, lock washer and nut on anyway, but...
>>
>> Are there any fixes?
>>
>> Thanks,
>> Ron Burnett
> Bummer; I know that hurts.
>
> A bit more detail, like brand/model & maybe a pic or two, might help us help
you.
>
> Charlie
>
> --
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