Empathy List Archives

B

brooksd2@hotmail.com

Wed, Jul 11, 2001 1:42 AM

Searched the archives and read all the responses, but it made me wonder has
anybody put together a system.
More importantly one that has worked. Since selling the sailboat that I had
grounded the mast, I feel the trawler lack protection being located in the
lightning capitol of the U.S.
I have trim tabs on my trawler and thought they might make a good ground
plane along with the bronze rudder and prop. Highest metal is the bimini
tops, so connecting them would make my system. Any comments would be
appreciated.
Dave
Silver Belle
Crystal River, FL

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Searched the archives and read all the responses, but it made me wonder has anybody put together a system. More importantly one that has worked. Since selling the sailboat that I had grounded the mast, I feel the trawler lack protection being located in the lightning capitol of the U.S. I have trim tabs on my trawler and thought they might make a good ground plane along with the bronze rudder and prop. Highest metal is the bimini tops, so connecting them would make my system. Any comments would be appreciated. Dave Silver Belle Crystal River, FL _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

A

adagio@our.net.au

Tue, Jul 17, 2001 7:58 AM

on 7/11/01 11:42, David Brooks at brooksd2@hotmail.com wrote:

Searched the archives and read all the responses, but it made me wonder has
anybody put together a system.

David,

You look on the Adagio website http://www.adagiomarine.com under Techno
tab you'll find several references on lightning grounding design, and link
to Ewen Thomson's definitive website on Lightning and Boats.

More importantly one that has worked.

All we can do is follow best-practice, which has been demonstrated to be
effective in most cases (Ewen has the statistics). If one of the rare 100kA
direct strikes finds you, then you'll have an opportunity to assess how
effective your particular system is :-) Nobody does full-scale boat in
saltwater tests at these energies.

Cheers,

Steve

on 7/11/01 11:42, David Brooks at brooksd2@hotmail.com wrote: > Searched the archives and read all the responses, but it made me wonder has > anybody put together a system. David, You look on the Adagio website <http://www.adagiomarine.com> under Techno tab you'll find several references on lightning grounding design, and link to Ewen Thomson's definitive website on Lightning and Boats. > More importantly one that has worked. All we can do is follow best-practice, which has been demonstrated to be effective in most cases (Ewen has the statistics). If one of the rare 100kA direct strikes finds you, then you'll have an opportunity to assess how effective your particular system is :-) Nobody does full-scale boat in saltwater tests at these energies. Cheers, Steve

R

rcrogers6@home.com

Tue, Jul 17, 2001 4:46 PM

I suspect that the US Navy might do this either in actual experiments with
small vessels or models of large vessels - a guess. It is a fact that the
effects of nuclear Electromagnetic Pulse (EMP) are simulated by computer. It
used to be a massive and expensive chore, but like all computer related
things, it is probably less expensive now. Therefore, one could probably
simulate a lightning strike on a computer. This would, not account for
uncertainty and the different types of strikes a vessel could be subject to.
However, it could certainly replicate a worst case strike.

On my sailboat, I gave up on protecting electronics and just focused on
creating a cone of protection for the crew - they are harder to fix.

Ron Rogers
Annapolis, MD

----- Original Message -----
From: "Steve Darden" adagio@our.net.au

All we can do is follow best-practice, which has been demonstrated to be
effective in most cases (Ewen has the statistics). If one of the rare

100kA

direct strikes finds you, then you'll have an opportunity to assess how
effective your particular system is :-) Nobody does full-scale boat in
saltwater tests at these energies.

I suspect that the US Navy might do this either in actual experiments with small vessels or models of large vessels - a guess. It is a fact that the effects of nuclear Electromagnetic Pulse (EMP) are simulated by computer. It used to be a massive and expensive chore, but like all computer related things, it is probably less expensive now. Therefore, one could probably simulate a lightning strike on a computer. This would, not account for uncertainty and the different types of strikes a vessel could be subject to. However, it could certainly replicate a worst case strike. On my sailboat, I gave up on protecting electronics and just focused on creating a cone of protection for the crew - they are harder to fix. Ron Rogers Annapolis, MD ----- Original Message ----- From: "Steve Darden" <adagio@our.net.au> > > All we can do is follow best-practice, which has been demonstrated to be > effective in most cases (Ewen has the statistics). If one of the rare 100kA > direct strikes finds you, then you'll have an opportunity to assess how > effective your particular system is :-) Nobody does full-scale boat in > saltwater tests at these energies.

trawlers@lists.trawlering.com

TWL: Lightning protection revisited