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johnr470(at)aol.com
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 Posted: Fri Mar 01, 2019 1:04 am Post subject: Grounding to tube structures |
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Unfortunately it is already covered and in the rear of the fuselage where access is somewhat difficult.
Thanks
| Quote: | On Feb 28, 2019, at 11:30 PM, AeroElectric-List Digest Server <aeroelectric-list(at)matronics.com> wrote:
*
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AeroElectric-List Digest Archive
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Total Messages Posted Thu 02/28/19: 4
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Today's Message Index:
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1. 06:29 AM - Grounding to tube frame structures (John Hulls)
2. 07:18 AM - Re: Grounding to tube frame structures (Robert L. Nuckolls, III)
3. 08:46 AM - Re: Static Wicks - Bonding of Flight Controls (Robert L. Nuckolls, III)
4. 04:34 PM - Re: Static Wicks - Bonding of Flight Controls (jsajpf)
________________________________ Message 1 _____________________________________
Time: 06:29:38 AM PST US
From: John Hulls <johnr470(at)aol.com>
Subject: Grounding to tube frame structures
What is the best method to ground a battery located behind the baggage compartment
to a frame tube in a fabric covered aircraft?
________________________________ Message 2 _____________________________________
Time: 07:18:39 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
Subject: Re: Grounding to tube frame structures
At 08:28 AM 2/28/2019, you wrote:
>
> What is the best method to ground a battery located behind the
> baggage compartment to a frame tube in a fabric covered aircraft?
You would like to have a gas-tight connection
to structure . . . ideally a welded bolt-
tab to accept the battery(-) lead.
Is the airplane already covered?
If not, adding the tab should be
a relatively simple task.
Bob . . .
________________________________ Message 3 _____________________________________
Time: 08:46:36 AM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
Subject: Re: Static Wicks - Bonding of Flight Controls
At 10:21 PM 2/27/2019, you wrote:
> <john.friday_adis(at)sbcglobal.net>
>
> Bob (et al),
> Looking for insight into legacy Type Certificated airplane design
> rationale for installing static wicks and bonding jumpers between
> fixed structure and movable flight control surfaces.
Selecting style, number and placement of
static wicks on a TC aircraft is an arduous
task made possible by a survey of the ship's
natural streamer locations . . . which
may or may NOT be in the same locations
for similar aircraft. We used to bolt
static wicks to some models at Cessna . . .
as I recall it was a kit that a customer
could order. But I'm 99% sure there were
no electro-static survey tools used to
optimize the location of wicks much
less confirm their efficacy.
> Several E/AB designs do not specify installation of static wicks nor
> bonding jumpers for flight control surfaces. The particular design
> I plan to build is among this group and reports from those with
> years flying the design are (albeit a limited number of
> respondents): no issues with P-static and the like.
Then I wouldn't worry about it. P-static
issues are rare in the OBAM aircraft world.
We just don't spend much time cruising at
300 knots through rain, snow or ice
crystals.
> I cannot attest to the types of operations, nor how frequent the
> exposure to conditions conducive to P-Static interference, for the
> respondents to my query.
>
> Looking for input from TC house folks (Bob) regarding rules of
> thumb, design standards, etc. regarding incorporation of static
> wicks and bonding??
>
> My experience with the subject matter is as a maintainer,
> troubleshooting reports of symptoms of P-Static while in visible
> moisture, required inspections after a lightning strike, routine
> verification (inspections) of electrode-to-surface bonding values,
> etc. Correction of broken or degraded control surface bonding cured
> the majority of reported faults. Some degraded antenna bonds are
> among the mix as well. Design standards applicable to mitigating
> P-Static trouble are not clear to me and my understanding of design
> criteria/recommendations is admittedly academic (at best).
>
> What say ye, the sage?!
I wouldn't bolt any hardware to the
airplane until experience suggests
it might fix a demonstrated difficulty.
Bob . . .
________________________________ Message 4 _____________________________________
Time: 04:34:39 PM PST US
Subject: Re: Static Wicks - Bonding of Flight Controls
From: "jsajpf" <john.friday_adis(at)sbcglobal.net>
Sounds like wisdom to me Bob. Thanks for the response!
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487869#487869
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JohnCiolino(at)carolina.r
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| Posted: Fri Mar 01, 2019 8:01 am Post subject: Grounding to tube structures |
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One route to go is to use a non-insolated Adel clamp (e.g. AN742-10 in
steel) on an interior tube. You would have to sand all the paint off the
tube to make good contact.
John Ciolino
Bearhawk Patrol
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user9253
Joined: 28 Mar 2008
Posts: 1935
Location: Riley TWP Michigan
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| Posted: Fri Mar 01, 2019 10:06 am Post subject: Re: Grounding to tube structures |
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The airframe does not necessarily have to be grounded does it?
Just run a separate cable from battery negative to the engine block or firewall.
If the airframe must be grounded, is there a convenient place forward of the battery?
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nuckolls.bob(at)aeroelect
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| Posted: Fri Mar 01, 2019 1:31 pm Post subject: Grounding to tube structures |
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At 03:02 AM 3/1/2019, you wrote:
| Quote: | --> AeroElectric-List message posted by: John Hulls <johnr470(at)aol.com>
Unfortunately it is already covered and in the rear of the fuselage where access is somewhat difficult. |
consider running a battery(-) wire all the way
up to the firewall ground stud. What size
engine and battery are we talking about?
How much wire to get from battery to firewall?
Bob . . .
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