Join Date: Oct 2006
Location: Callao, VA
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Re: lightning advice
you may want to do some further research, there is a lot here and other sites. Some is rubbish (ie wrapping a chain around the mast and dropping the other end overboard) and some has merit, although lightning AKA mother nature will show you those shortcomings. Some of the radio communication and tower manufacturer sites will provide some more realistic mitigation thoughts.
Unless you are having the builder take the absolute shortest path from the mast and plates, via at least a 1/0 copper cable, to the keel with NO mechanical connections....lightning will find the shortest path, or jump to ground.
The idea of "attaching" (anything mechanical) the stuff to a cable and dropping the end in the water is absurd if you think lightning will follow the path YOU deem. Not going to happen. Even cadwelds and welded connections will blow apart when a strike occurs.
Your best bet is to avoid the strike, good insurance and luck. You are creating a boat that will have zinc/bonding/ground issues. Stick with ABYC.
As to electolysis, even a poorly designed ground plate or improperly installed and grounded can cause issues tough to find. Read up on ground loops, potential to ground, measuring leakage, etc.