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Copper plate found on hull...

2135 Views 15 Replies 7 Participants Last post by  aa3jy
Hello All! Took boat out in the river, put on scuba gear and dove to scrub hull and put new shaft zinc on. Found a thick copper plate on stbd side. 3/4 inches thich, 14 inches long, 4 inches wide, pointed on forward end, flat on the aft end. So, I reckon it's a grounding plate for SSB or to ground against lightning?? Can anyone tell me how it is connected? I'm thinking to the lead in the keel and then via the stainless keel bolts? Very interesting... Have never seen any copper strap or braid anywhere in bilge, but wasn't really looking. Thanks for any help/advice. You guys are the most knowledgable! Kevin
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Solid copper? Or perhaps sintered bronze?

Solid copper could be a DIY grounding plate, but the Dynaplate is sintered (foamed metal, lots of air in it) bronze. A dynaplate is a radio ground, and can actually be dangerous if you use it as a lightning ground. If a zillion volts goes through it, all the water in all the spaces in the sintered metal superheats and turns to steam, with explosive results that can blow the plate and a big hole in your hull.

So take a look inside the boat. A Dynaplate is a good thing for radios, but if the PO was foolish enough to use it for the lightning ground as well, you'd want to relocate that connection ASAP. If you have an external metal keel, usually the lightning ground would be factory connected to that, directly.
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