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kjburns(at)btinternet.com
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 Posted: Tue Feb 21, 2012 1:38 pm Post subject: Re : Lightning Strike-possible protection ? Faraday cage eff |
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All,
Metal aircraft benefit from the Faraday cage effect , as the strike tracks across the surface of the airframe and exits through a point on opposite surface.
Why can we not have a layer of conductive paint to create a Faraday cage ?
The top most layer would be easiest for electrical conductivity, but base coats would do a similar job in protecting the airframe below.
Seems others have used this technique before -http://www.aztechnology.com/PDFs/materials-catalog.pdf
I got to thinking what protected the wooden gliders soaring Cu-nims in early days of soaring ?
Could it have been the aluminium powder in the dope ( used in base coats to protect the cotton fabric and wood from UV damage) therefore creating a Faraday cage ?
Constructive thoughts please..
Kevin Burns
From: K BURNS <kjburns(at)btinternet.com>
To: "europa-list(at)matronics.com" <europa-list(at)matronics.com>
Sent: Tuesday, 21 February 2012, 0:19
Subject: Re: Re : Lightning Strike
Meet the guys that had to bail out of the K 21 Glider :-
http://www.youtube.com/watch?v=HeLl_Clxf1g
From: John Wigney <johnwigney(at)windstream.net>
To: martflynut(at)aol.com; Europa-List <europa-list(at)matronics.com>
Sent: Tuesday, 14 February 2012, 15:52
Subject: Europa-List: Re : Lightning Strike
Hi Martin,
You may have heard this before but for small planes, the conventional wisdom in the US is to stay a minimum of 20 miles from a thunderstorm. This might seem a long way but I am pretty sure it was developed at the school of hard knocks.
In poor weather a few years ago in Arkansas, I inadvertently strayed much closer and was startled with a large lightning bolt much too close for comfort. Once is enough; I try not to repeat that.
Cheers, John
N262WF, mono XS, 912S
Mooresville, North Carolina
[quote]Subject: Lightning Strike
From: "Martin Olliver" <martflynut(at)aol.com> (martflynut(at)aol.com)
Hi All. Has anyone experienced a lightning strike in a Europa? If not what is the
perceived result of such a strike? A few years ago in the south of England
a plastic glider was struck and broke up in flight both occupants survived as
parachutes were deployed. A luxury I am unable to have due to size issues (not
saying I am fat just well built!) My concern with the Europa is the lack of bonding
between components and conductors to ensure components don't explode apart,
as happened with the glider.
If as I suspect we all take a risk with this issue has any one considered any
possible remedial action to improve the situation?
Martin.
http://www======================
http://www.mat="http://forums.matronics.com" rel="nofollow" target="_blank">http://l="nofollow" target="_blank">http://www.matronics.com/contribution============
[b]
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nigel_graham(at)m-tecque.
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| Posted: Tue Feb 21, 2012 3:12 pm Post subject: Re : Lightning Strike-possible protection ? Faraday cage eff |
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An interesting thought process Kevin and coincidentally, the same path that the designers of the “Hindenburg” followed, reasoning that it would give the envelope protection from lightening and UV damage. What they failed to appreciate was that that the aluminium oxide based paint they chose to use was also highly inflammable. It is now widely believed that it was a lightning strike that ignited the painted fabric as the Hindenburg docked at Lakehurst. Admittedly, your Europa might not be filled with hydrogen, but resulting pyrotechnics would be something to behold!<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
Nigel
On 21/02/2012 21:36, K BURNS wrote: | Quote: | All,
Metal aircraft benefit from the Faraday cage effect , as the strike tracks across the surface of the airframe and exits through a point on opposite surface.
Why can we not have a layer of conductive paint to create a Faraday cage ?
The top most layer would be easiest for electrical conductivity, but base coats would do a similar job in protecting the airframe below.
Seems others have used this technique before -http://www.aztechnology.com/PDFs/materials-catalog.pdf
I got to thinking what protected the wooden gliders soaring Cu-nims in early days of soaring ?
Could it have been the aluminium powder in the dope ( used in base coats to protect the cotton fabric and wood from UV damage) therefore creating a Faraday cage ?
Constructive thoughts please..
Kevin Burns
From: K BURNS <kjburns(at)btinternet.com>
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gregoryf.flyboy(at)comcas
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| Posted: Wed Feb 22, 2012 6:30 am Post subject: Re : Lightning Strike-possible protection ? Faraday cage eff |
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Kevin,
I was thinking along the same lines as Frans comments. It would probably take a wire mesh over the body of the aircraft at a minimum, to protect the airframe.
OR....Possibly a 'lightening rod' that can handle large amounts of current, and that is more conductive than the linkages in the aircraft could span between the wingtips, and another one that spans fore and aft. The lightening always likes to find the path of least resistance, and so it would grab the rods instead of the aircraft, and pass harmlessly from one side to the other. Just a thought.
Possibly, one might think that it might attract lightening to the craft....but there have been some experiments taken that might prove otherwise. Most likely, the lightening would have been striking very close to the plane anyway by coincidence, before it would grab the plane.
Greg
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