> ...
> Conductors from one wingtip to the other could be
> avoided by adding surpressor coils i suppose? Anybody
> with some specialisation in that direction?
No specialization by me for sure, but there's research as to how a
wing or fuselage must present a preferential path to wiring and
control mechanisms...down to a measure of milliohms in aluminum skin,
or that of copper mesh embedded in fiberglass.
> supressing ferrites, like you often see on
> computer connection wires.
Them's just turn EMI into heat, for like the few volts P-P from a
switching power supply cube or VGA output to monitor. Lightning along
the path of a wire...lightning I think wins. :-)
> Also preventing coils like loops in wires helps. I once
> saw a very nice panel, where every wire going to and
> coming from was left extra long nicely coiled in a perfect
> erm pickup arrangement. Looks great but any lightning
> miles away....
But a single loop of wire, 6" diam, is a small fraction of a
microhenry, which is a significant reactance only in the many
megaHertz region. In fact, a single coil of wire is Narco's
recommended oscilloscope pickup for UHF (glideslope). For lightning,
whose spike patterns are well documented -- how StrikeFinders work,
more audio freq vs. toward gigaHertz, it should be invisible. One ADF
maker says you don't shorten the antenna cable; you wind excess into a
coil and stow it.
Point is, I believe there's nothing we can do short of correct
conductive mesh. If you don't get that right, then the "action
integral" math might say just a little too much mesh resistance can
turn the wing and/or fuselage into a no-longer-structural black char?
Better to let the average bolt punch through plastic skin and travel
along wiring and/or control mechanisms. Remove headphones in the
vicinity of CBs!
Reg,
Fred F.
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