Forespar Lightning Master™(Static Dissipater) Who's been hit with one? - Page 2 - SailNet Community

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View Poll Results: Has your boat ever been hit by lightning with a Forespar Lightning Master™ installed?
Yes 1 16.67%
No 5 83.33%
Voters: 6. You may not vote on this poll

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  #11  
Old 11-03-2010
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I can't believe no one said "Its better to have a static dissipator and not need one than to need one and not have it"

OK - chill out, just pulling your chain.



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  #12  
Old 11-03-2010
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I don't believe a faraday cage needs to be grounded to work. They just need to be complete—surrounding whatever they're protecting completely. A pressure cooker, which puts a solid layer of stainless steel around the contents is a good faraday cage.
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  #13  
Old 11-03-2010
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I got hit twice last year. I do not have the bottle brush on top of my mast. I got the side flash from both lightning strikes. The two boats that took the major strike both had the bottle washers on top of the mast. Both sustained major damage including haul out. Both lost all electronics on the boat. 5 boats around these two boats (myself included) lost some electronics.
The first time I got hit I was onboard the boat. Scared the C*@p out of me. I did put all my electronics in the mircowave and oven. My only lost was two brand new cabin fans, just installed 2 hours prior to strike. Second time I lost my battery charger.
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  #14  
Old 11-03-2010
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I have been told that the boat does have to be grounded for the Faraday cage to work or for the bottle brush to work, but I would need to brush up on my physics to answer that for sure.

Tin foil is not the right material to protect electronics. I was told that lead foil is. I have been told that many of the older manufacturers of sensitive equipment put their boards in lead foil.

THis is all hear say.

I am surprised this conversation has not turned into a 'ground or don't ground your boat' debate.

Brian
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  #15  
Old 11-03-2010
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CD—

A faraday cage is essentially a hollow conductor. It does not have to be grounded for the cage to protect whatever is inside it from the induced voltage of a lightning strike. When lightning induces a voltage drop across a Faraday cage, the charge levels in the conductor the cage is made out of end up neutralizing the effects within the cage itself, as seen in this image from the wikipedia page on Faraday cages:



Also, consider that if the Faraday cage itself were struck by lightning, the electrons, wanting to repel each other, would only travel along the exterior surface of the Faraday cage, leaving the interior untouched. Now, if the Faraday cage is not grounded, it would hold the charge until something that is grounded comes into close enough proximity for it to discharge the static surface charge.

Whether the cage is grounded or not has little affect on its ability to protect its contents. Of greater import is what the cage is made of. A solid conductive cage, like a stainless steel pressure cooker is far more protective than the mesh of a microwave oven or a marine stove's oven, which often has a large glass window. Either of these would leave gaps in coverage.

The static dissipator would need to be grounded, since it is trying to equalize the static electricity with the surrounding area and reduce the chances of a lightning strike. Forespar says this very clearly in their brochure:

Quote:
Static dissipators may be mounted on any of these points, as long as they are provided with a direct electrical path to ground. If you have already bonded and grounded your mastheads, masts and standing rigging as described above, a dissipator may be added directly to your mastheads.
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Originally Posted by Cruisingdad View Post
I have been told that the boat does have to be grounded for the Faraday cage to work or for the bottle brush to work, but I would need to brush up on my physics to answer that for sure.

Tin foil is not the right material to protect electronics. I was told that lead foil is. I have been told that many of the older manufacturers of sensitive equipment put their boards in lead foil.

THis is all hear say.

I am surprised this conversation has not turned into a 'ground or don't ground your boat' debate.

Brian
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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  #16  
Old 11-03-2010
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Spot on Professor Dog
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  #17  
Old 11-03-2010
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Quote:
Originally Posted by cruisingdream View Post
Spot on Professor Dog
Try this? Um, never mind.
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  #18  
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Quote:
Originally Posted by MC1 View Post
Try this? Um, never mind.
Don't believe that's animal safe...
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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  #19  
Old 11-03-2010
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Get a slip next to a boat with a taller mast

When building my house I was asked if I wanted lightning rods by the builder. I said no, but I'm willing to pay to put them on my next door neighbor's house .
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  #20  
Old 11-03-2010
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Quote:
Originally Posted by capecodda View Post
When building my house I was asked if I wanted lightning rods by the builder. I said no, but I'm willing to pay to put them on my next door neighbor's house .
Having a boat nearby with a taller mast is not a solution. Ask Maine Sail. Basically, LIGHTNING DOES WHAT IT WANTS... anything you do to try and change its behavior is mainly wishful thinking and will make you feel better, but really not help at all.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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