"w_tom" wrote in message
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Transmitted an incomplete post. Sorry for the mistake.
Now for that airplane. Notice earth ground is the tail
section:
http://bm6aak.myweb.hinet.net/file/456.gif

OH, cool but of course it simply proves my points.

Of course this airplane ground is completely beyond the
scope of the current discussion.

You mean beyond you.

Airplanes are more difficult
to ground.

No, airplanes are impossible to proactively ground while in flight(save a
high energy beam) and much more importantly the is no need to ground an
airplane in flight. There is just a need to have a good continuous Faraday
Cage. Damn, how did anyone ever survive when planes were made of wood or
paper(or are they non-conductors)?

A Pan Am 707 was destroyed by lightning over
Elkland MD because internal grounding was not sufficient.

Oh, you mean the Faraday Cage was discontinuous or flawed or maybe it was a
super bolt of the kind that has punched holes in heavy gauge steel petroleum
tanks.
In any case I'll bet that the cockpit radio was undamaged at least until
impact.

An
airplane must be grounded so that any part can become an earth
ground; making airplane design more challenging.

HUH?

We, on the
other hand, are having enough trouble discussing simple
structural earthing - a well proven 1930 technology. Why then
complicate it with airplanes and other irerelevant questions?

Because device/PC protection design has little to do with earth grounding.

w_tom wrote:
...
Now for the completely irrelevant topic of ground in an
airplane:

Ron Reaugh wrote:
"w_tom" wrote in message
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Computer internal protection assumes the building
has implemented a 'whole house' protector on AC mains
connected less than 10 feet to central earth ground.

That's simply wrong/false. There is nothing magic about 10
feet except that an electrical pulse travels about that far
in 10 nanoseconds. What do you suppose the risetime of a
lightening bolt is and how does that relate to that 10
feet? Define "central earth ground" and what it's
important characteristics are. Where is the "central earth
ground" on an airplane, car, ISS or on the Antartic pole
US base(over a mile thick cold pure ice)? Are all PCs and
electronics gadgets there doomed? Ever heard on the concept
of a Farady cage?
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