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

Of course this airplane ground is completely beyond the
scope of the current discussion. Airplanes are more difficult
to ground. A Pan Am 707 was destroyed by lightning over
Elkland MD because internal grounding was not sufficient. An
airplane must be grounded so that any part can become an earth
ground; making airplane design more challenging. 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?

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

Ron Reaugh wrote:
"w_tom" wrote in message
...
...
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?
...