Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 25-07-2016, 17:29   #46
Registered User

Join Date: Sep 2015
Location: Out of Norfolk Va
Boat: Tartan 37
Posts: 417
Re: Lightning strike! Now what?

Lightning will travel 5 miles through the air, it can jump a few inches in a boat with no problem.
__________________

__________________
puffcard is offline   Reply With Quote
Old 25-07-2016, 17:39   #47
Registered User
 
Nicholson58's Avatar

Join Date: Jan 2011
Location: Grand Rapids, Michigan
Boat: Camper & Nicholson58 Ketch - ROXY Traverse City, Michigan No.668283
Posts: 3,452
Images: 83
Re: Lightning strike! Now what?

Took two years to sort out what was lost on our last hit. I recommend you consider adding two pole toggle (air gap) switches to all electronics. The software switches on electronics leaves the device connected to the + and - even hen off. Use the two pole switches to break both pos and neg connections. This may have spared my Simrad and it radar and depth scanner while all othe devices were smoked.
__________________

__________________
Nicholson58 is offline   Reply With Quote
Old 26-07-2016, 16:26   #48
Registered User
 
Davidhoy's Avatar

Join Date: Jul 2016
Location: Fort Lauderdale
Boat: Morgan 462
Posts: 553
Re: Lightning strike! Now what?

UPDATE: Met with the insurance surveyor today, and we went through every system connected to the AC an DC electrical busses. Mostly as expected, but a few extra things are non-functional like the water maker and bow thruster. Could just be the control boards, so relatively easy to repair. The goal is to repair rather than replace things, wherever possible, as that way it will be fully covered by the insurance (less the deductible of course), as then I dint have to worry about depreciation.

Also met with a guy at a local full-service boat yard who can take on the project of getting everything back to normal. He's going to handle the electrics and such, and subcontract the electronics. I like the guy, and the yard is reputable. Hauling out on Aug 8th, probably for about three weeks. I wish I could tackle this myself, but I don't have the time or expertise, and insurance will cover getting it done professionally. He's agreed to let me participate as I can so that I can learn.
__________________
Davidhoy is offline   Reply With Quote
Old 26-07-2016, 17:57   #49
Registered User
 
deblen's Avatar

Join Date: Oct 2014
Location: Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 1,330
Images: 1
Re: Lightning strike! Now what?

Quote:
Originally Posted by Davidhoy View Post
UPDATE: Met with the insurance surveyor today, and we went through every system connected to the AC an DC electrical busses. Mostly as expected, but a few extra things are non-functional like the water maker and bow thruster. Could just be the control boards, so relatively easy to repair. The goal is to repair rather than replace things, wherever possible, as that way it will be fully covered by the insurance (less the deductible of course), as then I dint have to worry about depreciation.

Also met with a guy at a local full-service boat yard who can take on the project of getting everything back to normal. He's going to handle the electrics and such, and subcontract the electronics. I like the guy, and the yard is reputable. Hauling out on Aug 8th, probably for about three weeks. I wish I could tackle this myself, but I don't have the time or expertise, and insurance will cover getting it done professionally. He's agreed to let me participate as I can so that I can learn.
This is where it gets tricky. Repair or replace?

Replace means you have 1+ yr factory warranty on new eqpt.-a definite plus.

Repair means you MAY have warranty on the parts replaced but probably not have warranty on non-replaced parts.

Labor warranty???

As a dealer/tech,I used to hate it when an adjuster wanted to mess around with "repair" . It seemed to be a no win situation,except for the ins.co. They get you to sign off at completion of repair & they're home free. You & the dealer/tech are left with the possible future problems.
Some items can be repaired because the damage is visible-hardware,chain plates,etc. Electronic boards are a different story.
I hope your dealer/tech is insistent on replacing as much as possible.
Don't be afraid to push the adjuster hard on this.He works for the ins.co. & his job is to save them money.Just the way it works.

Best of luck/ Len
__________________
My personal experience & humble opinions-feel free to ignore both
deblen is offline   Reply With Quote
Old 26-07-2016, 18:00   #50
Registered User
 
deblen's Avatar

Join Date: Oct 2014
Location: Grand Manan,N.B.,Canada N44.40 W66.50
Boat: Mascot 28 pilothouse motorsailer 28ft
Posts: 1,330
Images: 1
Re: Lightning strike! Now what?

Quote:
Originally Posted by Nicholson58 View Post
Took two years to sort out what was lost on our last hit. I recommend you consider adding two pole toggle (air gap) switches to all electronics. The software switches on electronics leaves the device connected to the + and - even hen off. Use the two pole switches to break both pos and neg connections. This may have spared my Simrad and it radar and depth scanner while all othe devices were smoked.
Good practice-2 pole breakers/switches.
__________________
My personal experience & humble opinions-feel free to ignore both
deblen is offline   Reply With Quote
Old 26-07-2016, 18:11   #51
Registered User
 
Davidhoy's Avatar

Join Date: Jul 2016
Location: Fort Lauderdale
Boat: Morgan 462
Posts: 553
Re: Lightning strike! Now what?

Quote:
Originally Posted by deblen View Post
Good practice-2 pole breakers/switches.
Definitely going to look into doing this with all significant systems. Also looking at fuses on both positive and negative leads. Thanks!
__________________
Davidhoy is offline   Reply With Quote
Old 26-07-2016, 18:40   #52
Registered User

Join Date: Apr 2014
Boat: Leopard 47PC 47 feet
Posts: 73
Re: Lightning strike! Now what?

We were hit twice within 80 days whilst moored in Florida. On each occasion, the cable steering became magnetized. When we turned the wheel while tied up at the dock, the compass would swing. We had to have the cabling removed twice! - and degaussed.
__________________
edmundsteele is offline   Reply With Quote
Old 02-08-2016, 05:59   #53
Registered User

Join Date: Feb 2010
Location: Western Basin Lake Erie
Boat: Catalina MK1 36
Posts: 13
Re: Lightning strike! Now what?

I would call my insurance company first. They will probably tell you to have the boat hauled to inspect the hull for pinholes (they don't want the boat sinking) and then go from there.
__________________
anchorman is offline   Reply With Quote
Old 02-08-2016, 08:24   #54
Senior Cruiser

Cruisers Forum Supporter

Join Date: Feb 2012
Location: Carrabelle, Florida
Boat: Self-built 44' steel trawler
Posts: 861
Re: Lightning strike! Now what?

The toilet brush can dissipate only a tiny amount of charge. The tricky thing to understand about lightning hits is that the static charge before the strike and the strike itself act very differently. Static builds on the tallest, sharpest point in the vicinity, making your mast and golfer's heads good targets. Static charges are not dependent on conduction, which is why you can build a charge in a hairbrush. The strike itself, however, is a massive voltage and amperage, with a large surrounding field. It's going to follow the easiest (best conducting) paths available to ground. Having a well-grounded mast concentrates the conduction on a safe route, but isn't likely to cleanly go mast to grounding plate to boiling a bit of the ocean without a few side routes through your electronics, which often have antennas and grounding. The field may wipe out delicate electronics like computers even if they are isolated. So, the sharp lightning rod above all antennas on your mast might increase the chance of a hit marginally, but an isolated mast is still a prime charge accumulator. Then the game becomes supplying really good routes to ground, which is why chain plates get melted. Without a good route, the chances of blowing holes in the hull go up.
__________________
tkeithlu is offline   Reply With Quote
Old 02-08-2016, 08:38   #55
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Lightning strike! Now what?

Photo of lightining actually hitting a sailing boat.

And you think a toilet brush lightning arrestor is gunna do diddly-squat???
Attached Thumbnails
Click image for larger version

Name:	image.jpeg
Views:	109
Size:	37.1 KB
ID:	128892  
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 02-08-2016, 09:09   #56
Registered User
 
Cadence's Avatar

Join Date: Dec 2008
Location: SC
Boat: None,build the one shown of glass, had many from 6' to 48'.
Posts: 5,889
Re: Lightning strike! Now what?

I bought a boat and it took me awhile to figure out what the wire was attached to the anchor. Apparently the former owner would lower the anchor into the water with it wired to the forestay if lightning was impending. a unique if not a cheap approach.
__________________
Cadence is offline   Reply With Quote
Old 02-08-2016, 10:13   #57
Registered User
 
jeremiason's Avatar

Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Sea Ray 270
Posts: 1,427
Images: 2
Send a message via ICQ to jeremiason Send a message via Yahoo to jeremiason Send a message via Skype™ to jeremiason
Re: Lightning strike! Now what?

BoatUS wrote two great articles on Lightening Strikes in 2010 and 2015 (See links below).

Both articles address lightening strikes, statistically (based on insurance claims), what to do if you are hit and what to look for.

A couple of things that were interesting in the articles were:

Multi Hull Sailboats have almost twice the chance of being hit by lightening as a Mono Hull Sailboat.

Boats over 40 feet are three times more likely (6 out of 1000 chances) to be hit by lightening than smaller boats (2 or less chances per 1000)

Static Dissipaters (Brushes on top of the mast) don't work.


Here are the links:
Your Boat's Been Hit By Lightning - Now What? - Seaworthy - BoatUS

Striking Lightning Facts - Seaworthy Magazine - BoatUS
__________________
Tom Jeremiason
Punta Gorda, Florida

jeremiason is offline   Reply With Quote
Old 02-08-2016, 10:19   #58
Registered User
 
jeremiason's Avatar

Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Sea Ray 270
Posts: 1,427
Images: 2
Send a message via ICQ to jeremiason Send a message via Yahoo to jeremiason Send a message via Skype™ to jeremiason
Re: Lightning strike! Now what?

Quote:
Originally Posted by Cadence View Post
Apparently the former owner would lower the anchor into the water with it wired to the forestay if lightning was impending. a unique if not a cheap approach.
I would wonder if the wire he used as a bridge would be able to take the heat of 1 Million Volts or more...

A friend's 42' Sailboat was struck by lightening in Mexico back in 2011.... He was at anchor at the time.

The lightening followed the anchor chain into the water.

He still lost all his electronics and electrical devices on board.

Unfortunately, the lightening also fried the chain causing it to break and the boat to end up on the beach!
__________________
Tom Jeremiason
Punta Gorda, Florida

jeremiason is offline   Reply With Quote
Old 02-08-2016, 11:27   #59
Registered User

Join Date: Feb 2011
Posts: 2,105
Re: Lightning strike! Now what?

Quote:
Originally Posted by Davidhoy View Post
Definitely going to look into doing this with all significant systems. Also looking at fuses on both positive and negative leads. Thanks!
Fuses, GFI, breakers, etc will do diddly squat if you get a direct hit from lightening. The massive charge will overwhelm just about anything you have aboard. They are good for other reasons, but not for avoiding lightening. And do not count on lightening taking the shortest path nor an all metal path. Its path is dictated by what is coming up from the earth, not your boat. You just happen to be in the wrong spot at the wrong time.
We sailed through the Indian Ocean in really violent thunder storms with lightening all over the place. Never got hit, at least not there.

Anchored in Jacksonville, FL and wham, out of a clear blue sky a scrawny bolt blew out virtually all our electronics, including epirb. All we saw was a flash of light, a whimpy bang, and the smell of fried insulation. So go figure.
__________________
reed1v is offline   Reply With Quote
Old 02-08-2016, 11:38   #60
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,214
Re: Lightning strike! Now what?

Quote:
Originally Posted by ramblinrod View Post
Based on several unsafe processes you described, and suggested someone else follow, you should pay the $100/ hr to keep you, your crew, and your boat safe from electrical fire until you learn how to troubleshoot and repair electrical systems properly.

Certified Raymarine Installer

I fixed a Raymarine radar on another boat in 20 minutes (for a beer) after the 'Certified Raymarine Installer' racked up an $800 bill and held up the boat in Honolulu for 3 weeks without finding the problem. The $100/hr guy didn't know that most sailboats have a terminal strip connection in the radar cable near the mast step so they can pull the mast. He unmounted and shipped all the radar modules back to the mainland for testing (they were fine). I cleaned the contacts on the terminal strip.
__________________

__________________
donradcliffe is online now   Reply With Quote
Reply

Tags
lightning

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lightning Strike and Wind Generator canucksailor Electrical: Batteries, Generators & Solar 1 27-09-2009 09:26
Lightning Strike - Sorta Therapy General Sailing Forum 1 26-09-2009 08:40
Lightning Strike Ti' Punch General Sailing Forum 17 19-09-2009 10:43
Lightning strike and VHF antenna and cable StanleyCup Marine Electronics 8 07-07-2008 08:37
lightning strike prevention/protection against? rexposeidon Health, Safety & Related Gear 32 04-06-2008 22:53



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:31.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.