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
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| 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
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| 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
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| Subject: | Re: Static Wicks - Bonding of Flight Controls |
At 10:21 PM 2/27/2019, you wrote:
><john.friday_adis@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
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| Subject: | Re: Static Wicks - Bonding of Flight Controls |
Sounds like wisdom to me Bob. Thanks for the response!
John
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http://forums.matronics.com/viewtopic.php?p=487869#487869
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