Copper sheet on the hull?

[moseriw]

nowadays w use copper-sponges for ssb grounding 5 inches by 2,5 inches gives us 2,5 m² ssb grounding!

[alansmith]

If the cooper plate is anywhere adjacent to sleeping berths.... it is solely against Marlin strikes late at night.

[Kita]

Originally Posted by alansmith

If the cooper plate is anywhere adjacent to sleeping berths.... it is solely against Marlin strikes late at night.

,now why didn't I think of that!

[Sailorbob8599]

Originally Posted by alansmith

If the cooper plate is anywhere adjacent to sleeping berths.... it is solely against Marlin strikes late at night.

Now this sounds interesting, but I confess my ignorance as having no knowledge of Marlin's or their history of attacks on boats. Are you suggesting a Marlin can determine there is a 'body' inside the vessel that might provide a meal? Could a Marlin sword penetrate a sturdy FRP hull? Would someone care to educate me and explain in more detail, I'm really interested to learn more on this subject.
ps: Has any forum member experienced a Marlin attack on their vessel? If so, how/why did it happen and what did you do to prevent it from doing harm to boat or crew?

[buzzstar]

Originally Posted by Sailorbob8599

Has any forum member experienced a Marlin attack on their vessel?

No, probably because of the copper plate on the hull exterior near the berth where I usually sleep. Originally, I had thought it part of a lightening protection system because it was in a precast (or at least intentionally formed) hull indentation. Then I thought it was a ground for the radio, but now I am pleased to learn its real purpose and effectiveness.

[Sailorbob8599]

Originally Posted by buzzstar

No, probably because of the copper plate on the hull exterior near the berth where I usually sleep. Originally, I had thought it part of a lightening protection system because it was in a precast (or at least intentionally formed) hull indentation. Then I thought it was a ground for the radio, but now I am pleased to learn its real purpose and effectiveness.

Brian, your response is meaningless. You've not explained the relevance of copper plate to the probability/possibility of being or, not being attacked.

[thruska]

Originally Posted by Kita

I have done considerable research on lighting & boats, it's possible for a strike to hit mast & travel through boat to ground or in the case of a boat,water... some fiberglass boats have metal through hull fittings that have been blown off in a strike,end result is a hole & down she goes! In my research I found that navy boats are all metal and they are struck often with no damage.. a fiberglass boat makes like a big resistor with a very small metal ground and all that voltage will blow that small metal piece right off the boat. But in the Navy's case they get no damage from a direct hit And the reason for that is that the whole ship makes for a wonderful ground. The lightning goes right through the ship and into the water and dissipate. Now a fiberglass boat doesn't even have to be hit to be a problem, the emp from a nearby strike can fry Electronics. The point to all of this is like one of the other fellows mentioned it's possible that somebody had the idea to dissipate a lightning strike through that plate. It's just a theory. But one that I find fascinating because the great big metal ship gets struck and has no damage. But a small fiberglass boat will take a lot of damage in a lightning strike. Lightning is funny stuff. It is always been a concern of mine because I live in one of the lightning hotspots in the world. If you find that it is something else please let us know I would be very interested. Thank you!

I think the thin thin thin copper will disintegrate instantaneously if direct hit and any thrubolt will likely also. The thrubolt gone allows water in....Back to the drawing board I think.

[Cadence]

Originally Posted by thruska

I think the thin thin thin copper will disintegrate instantaneously if direct hit and any thrubolt will likely also. The thrubolt gone allows water in....Back to the drawing board I think.

I don't know about it disintegrating? It would provide a large surface area for dissipation of a strike. If it did go proof, who would care, it did its job.

[LLizzard]

My vote is for a ground plate for a radio or electronics, similar to the copper bars that used to be installed on some boats.
Re the deck, probably a cheap fix for leaking decks. I've seen burlap put down and covered with some sort of white mastic as a cheap way to fix leaking decks.

[buzzstar]

Originally Posted by Sailorbob8599

Brian, your response is meaningless. You've not explained the relevance of copper plate to the probability/possibility of being or, not being attacked.

You need to reread you own ps. You asked for an explanation of if so.

[thruska]

Originally Posted by Cadence

I don't know about it disintegrating? It would provide a large surface area for dissipation of a strike. If it did go proof, who would care, it did its job.

Yeah I don't know either, but I think the DIRECT hit might blow out the thruhullbolt attached to the thin plate and as previously mentioned sink the boat , no purpose served then.
With that in mind, (my heavy ground cable from mast to keel bolt, keel bolt embedded in lead keel ) would a direct hit blow molten lead out of the keel?

The question is not tthread related perhaps. But the electrical calculations are not in my manual.

[Kita]

I read somewhere about a keel getting blown off of a smaller sailboat but I have no idea if that is really plausible but I could definitely see a thru Hull fitting getting blown off & if you weren't there that could sink it....I did see where they actually caught this on security camera in the marina where there was a strike in between two boats and there was quite a bit of damage to electronics in both. .parts of the top of the mast were melted into the deck on one ! That was NOT a direct strike, but they said the EMP is what damaged the Electronics. Those were both fiberglass boats

[buzzstar]

Originally Posted by Sailorbob8599

Now this sounds interesting, but I confess my ignorance as having no knowledge of Marlin's or their history of attacks on boats. Are you suggesting a Marlin can determine there is a 'body' inside the vessel that might provide a meal? Could a Marlin sword penetrate a sturdy FRP hull? Would someone care to educate me and explain in more detail, I'm really interested to learn more on this subject.
ps: Has any forum member experienced a Marlin attack on their vessel? If so, how/why did it happen and what did you do to prevent it from doing harm to boat or crew?

I have conducted a complete poll (although I have reason to believe one may have been a Pole) of the marlins and marlin fishing types that I know, including on guy who had caught a sawfish on a tattered piece of polyester line, and they were in complete agreement. Slightly corroded copper is best. as it does not do its job so well when new or freshly shined.

[IslandHopper]

If a Marlin want's to get you it will find a way, an iddy biddy piece of copper won't stop it, it will just find another way in, there is no where to hide and no one is safe!

https://www.youtube.com/watch?v=WWaJNXnH1_g

[Cadence]

Originally Posted by IslandHopper

If a Marlin want's to get you it will find a way, an iddy biddy piece of copper won't stop it, it will just find another way in, there is no where to hide and no one is safe!

That's one hooked. A little different.