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Old 25-09-2014, 15:50   #31
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pirate Re: How to prepare for lightening strike???

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Old 25-09-2014, 15:53   #32
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Re: How to prepare for lightening strike???

Here-read this.Most comprehensive you'll find:
Lightning Attenuation Onboard

MarkJ- THANKS FOR CHUCKLE !
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Old 25-09-2014, 19:59   #33
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Re: How to prepare for lightening strike???

When I took on my current cat, aluminium hull with 100 ft mast ,I became neurotic about ' lightning strikes'. Did a fair bit of research but could not find a definitive solution to the risk.

This is what I sourced.

Patent devices need to be installed at new build stage but lack warranties on effectiveness. Cats are no more susceptible than monos or houses.A strike or near strike , on a boat . will fritz the electrics but will seriously harm the crew if in a vulnerable position i.e. become a conductor.

Best advice , from an Electronics Engineer, 1) keep well insured 2)Use two wooden spoons to hold wheel.

The theory is simple and at the end of the day , there are no guarantees. Try to avoid storms. I'm also open minded and follow this blog with interest
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Old 25-09-2014, 20:35   #34
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Re: How to prepare for lightening strike???

Quote:
Originally Posted by Arthur Garfield View Post
Here-read this.Most comprehensive you'll find:
Lightning Attenuation Onboard

MarkJ- THANKS FOR CHUCKLE !
Pretty good description of our vessel. Heavy 3-inch wide copper strip throughout the boat as "equalizer" and all rigging & internal metal stuff bonded to it. All connected to several ground plates in the hull. We have a mast fuzzie on the main mast and antenna, electronic & windex arrays on both masts. The ballast is encapsulated.

The fuzzy protected itself July 5 when we received a massive hit by accounts of other boaters.

A few bits of melted SS unknown stuff on the deck.
Windex on the Main mast was vaporized.
All mast top LED lights on both masts destroyed.
3 of 6 LED spreader lights blown
VHS radio blown
AIS Watchmate blown
Stereo system blown
All wiring in the bow fused
3 LED cabin lights blown
AWL GRIP on the transom overhang crazed
Raymarine speed transponder not working.
Raymarine wind speed & direction not reliable - but that's normal.
1.5 KW alternator on the generator - all diodes blown
Autopilot computer is dodgy
14 BUSS glass tube fuses blown.
2.5 KW Xantrex charger-inverter was off-line but a total re-boot brought it back
The main 60 amp shore power breaker had one leg blown.
I think there is something amiss in the main shore power/gen/off switch.

Odly, the SIMRAD in the nav station, Radar & underwater fish scanner were not damaged. These were separately switched with dry open contacts, so not connected to the boat power system.
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Old 25-09-2014, 22:37   #35
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Re: How to prepare for lightening strike???

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Originally Posted by boatman61 View Post
Git yer finga outta teh triger gard, duckhead.

Did I spell that right?
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Old 26-09-2014, 04:22   #36
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Re: How to prepare for lightening strike???

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Originally Posted by Cheechako View Post
.......
Airplanes are struck all the time, I wonder why they don't usually have damage? No path to ground?
They often have damage, usually slight but not always; sometimes the damage is very minor, other times somewhat serious. Most carriers have an inspection routine to follow after a lighting strike. I have carried quite a few such inspections.

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Data is definitely kept, by several agencies I'd bet, aircraft have no lightning rods, dissipators or whatever, they have static wicks that discharge static of course and often lightning will exit from these or wingtips, it seems to find a sharp corner for some reason.
One interesting thing is that lightning can / will exit from several locations.
One AH-64 that I watched get struck in Hanau Germany that was chained to the ground by six steel chains to grounded tie downs, the lightning exited from the pitot tubes as well. We knew this as the pitot tube covers had holes burned through the ends of them. The AH-64 is a flying computer, dozens of them and packed with electronics, but even though it was a direct hit, everything worked, and there are no provisions to protect the avionics from a lightening hit.

I feel sure that the only thing you can count on with lightning is that it does not follow any rules, there are no absolutes
Actually the are many aspects of avionics design and installation practices that limit their exposure to damage of lighting strikes but it is all behind the scene stuff so as to speak.

My take on lighting is that it does follow all the rules of electrical theory, electromagnetic radiation etc; it's more that most of us don't understand the theory of large fields plus the medium that the event occurs in (ie the atmosphere) is a very complex and dynamic medium so it very hard (impossible?) to predict all the possible outcomes of any strike.
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Old 26-09-2014, 06:22   #37
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pirate Re: How to prepare for lightening strike???

Wot e sed....
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Old 26-09-2014, 06:25   #38
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pirate Re: How to prepare for lightening strike???

Quote:
Originally Posted by StuM View Post
Git yer finga outta teh triger gard, duckhead.

Did I spell that right?
But... But... He's American... and an 'Association Member'... he's an expert....
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Old 26-09-2014, 06:55   #39
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Re: How to prepare for lightening strike???

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But... But... He's American... and an 'Association Member'... he's an expert....
I'd say he's a "Country Member"

(And the crowd yelled out "Yes, we remember!")
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Old 26-09-2014, 06:59   #40
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Re: How to prepare for lightening strike???

Sheesh. Bunch of comedians. Everyone knows you lighten ship in the doldrums by throwing the horses overboard, hence the 'horse latitudes'.
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Old 26-09-2014, 07:42   #41
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Re: How to prepare for lightening strike???

Would a keel-stepped mast provide a direct path to ground/water?
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Old 26-09-2014, 14:37   #42
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Re: How to prepare for lightening strike???

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Would a keel-stepped mast provide a direct path to ground/water?
No, not usually; it would be rare (I think) to find any decent (low loss) electrical connection between the foot of the mast and the actual lead of the keel.
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Old 26-09-2014, 21:32   #43
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Re: How to prepare for lightening strike???

I hang a cable off my stays into the water, easy to do. but im sure my boat has a copper plate in the keel grounding the mast.
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Old 30-09-2014, 18:38   #44
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Re: How to prepare for lightening strike???

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No, not usually; it would be rare (I think) to find any decent (low loss) electrical connection between the foot of the mast and the actual lead of the keel.
I disagree. The Heritage One-Ton I raced for many years had a steel armature as part of the hull structure. The metal mast step was bolted to it and the mast rested directly on it. Keel bolts were secured to the armature. Keel was solid lead. Paint was electrical conducting. The result is a large surface area to ground. If you are worried about this path, add bonding wires internally; mast fo step to keel, and a ground plate to the keel itself. I suggest the bottom of the keel would be least disruptive to water flow.
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Old 01-10-2014, 13:32   #45
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Re: How to prepare for lightening strike???

My 2 cents worth -
I "prepare" by putting everything electronic that I can in the oven, which I hope will act as a Faraday Cage.
IMHO (as a former E. E.) Lightning rods ATTRACT lightning, which is exactly what I want to avoid.
If you can't get out of the way - hunker down and pray!
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