lightning strike - part 2

Well, I am hauling tomorrow and replacing seacocks (at least). I hammered the hell out of
them with no results. The radar is dead. The VHF radio works, defying logic. The VHF
antenna vaporized…otherwise, alternator, regulator, GPS, etc all work fine, go figure.

The boat has that special copper plate under water, “sintered” or something like that.
There is a grounding wire to the mast, but it was not connected at the time. I’m pretty
confused by the whole thing.

Thanks for all the postings with info. I’ll let you know what I find when I haul…

Julian

Dear Julian,
Sadly I have a great deal of experience with lightning
strikes. My Valiant 50 was hit and the strike caused
almost $150,000 of damage.
Because of the extent of the damage to the Valiant I
was very cautious about the lightning protection on
Cyrano my BCC.

What happens is that in addition to the massive amount
of voltage which traverses the boat there is an EMP or
electromagnetic pulse which also occurs. That is what
damages the 12 volt stuff in bizarre ways.
When your boat is hauled, carefully inspect the hull
for tiny pinholes or other evidence that the
tremendous heat generated by the strike boiled the
laminate or separated the layers of the laminate. Use
a flashlight to inspect the laminate for any evidence
of such holes or spider like cracks. Generally they
will appear near thru-hull fittings.
Also expect other electrical anomalies to begin to
appear with wiring and the like. Assuming you have
made an insurance claim insist on a survey by a
surveyor familiar with damage from lightning.
Good luck !
Jim

— pelenur <pelenur@yahoo.com > wrote:

Well, I am hauling tomorrow and replacing seacocks
(at least). I hammered the hell out of
them with no results. The radar is dead. The VHF
radio works, defying logic. The VHF
antenna vaporized…otherwise, alternator,
regulator, GPS, etc all work fine, go figure.

The boat has that special copper plate under water,
“sintered” or something like that.
There is a grounding wire to the mast, but it was
not connected at the time. I’m pretty
confused by the whole thing.

Thanks for all the postings with info. I’ll let you
know what I find when I haul…

Julian

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