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We often see some discussions about lightning protection but here in
FL, it is really a major problem, especially for myself since I seem to have a peculiar affinity for it. I have seen it do the following: While sitting on the toilet, it jumped from the faucet to drain melting the fixture (literally scared the crap outa me) After a thunderstorm while riding my bicycle, it struck the road in front of me leaving a dry spot 30' in diameter. Struck my phone lines and melted my telephone. After a storm, ball lightning appeared about 30' up, slowly moved along the shore while I tried to figure what to do. It hit a nearby pine tree which exploded showering me with debris. In deep woods during a storm, I sat under a picnic shelter on top of a dry picnic table on top of dry concrete. It jumped out of a nearby conduit and to the DRY concrete floor in front of me. I sometimes think God is ****ed at me for some reason but can't figger out why. This has affected my career (graduate work was "Free Electron Charging of Fine Aerosol Particles) and made me VERY paranoid about sailing during thunderstorms. My normal lightning protection method is to try to get it to ground as quickly as possible. I have a 2'X2' copper sheet with a very large tinned copper braid soldered and crimped to it that I drop overboard. The otehr end of the braid has two welding clips that I attach to the upper and lower shrouds near the deck. I turn off and unplug all electronics and stay away from all metal fittings. I have even considered a retractable Faraday cage attached to the mast head consisting of small wires to protect the boat inside it. Am I too paranoid? However, I am curious about lightning protection for less afflicted ppl. I have seen these ground plates consisting of sintered bronze powder that are fairly small but have high surface area due to the many sintered particles (Dyna-Plate). I can believe these may work for low E fields and low current but I do not believe they work for high fields and high currents (like lightning). I think the small passages act like tiny Faraday cups allowing no field inside and the effective surface area is not much larger than the external area. What do others think? |
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