Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 29-08-2016, 19:51   #1
Registered User
 
Delancey's Avatar

Join Date: Oct 2011
Location: nondum cognita
Boat: sailboat
Posts: 3,077
Lichtenberg Figures

Years ago I was delivering a sailboat and took a lighting strike that did a fair amount of damage.

We had the boat hauled for a survey and I remember that as the bottom paint dried, it revealed the surface of the hull had a patterning of what I called "little lightning bolts" etched into the surface.

Although the entire hull had the little lighting bolts all over it, they seemed to be more heavily concentrated in areas where there was metal near the hull, such at the three points of a danforth anchor lying under a quarter berth or where the engine mounts were located.

Today, after many years of not knowing they had a name, I found out they are called Lichtenberg Figures. Now you know too!

https://en.m.wikipedia.org/wiki/Lichtenberg_figure#
Attached Thumbnails
Click image for larger version

Name:	image.jpeg
Views:	115
Size:	80.0 KB
ID:	130280  
__________________

__________________
Delancey is online now   Reply With Quote
Old 29-08-2016, 20:09   #2
cruiser

Join Date: May 2010
Location: SF Bay Area; Former Annapolis and MA Liveaboard.
Boat: Looking and saving for my next...mid-atlantic coast
Posts: 6,198
Re: Lichtenberg Figures

Delancey

Thank you for sharing this. I was wondering what this was recently.
__________________

__________________
SaltyMonkey is offline   Reply With Quote
Old 29-08-2016, 20:29   #3
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in the Caribbean
Boat: Beneteau 393 "Sea Life"
Posts: 12,411
Images: 25
Re: Lichtenberg Figures

That is just the weirdest thing i have even seen!
I just dud a google image search on Lichtenberg figure and its just crazy what it does to people and animals!

Must be painful.

Wonder how long it takes to heal?
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 29-08-2016, 21:14   #4
Registered User
 
Delancey's Avatar

Join Date: Oct 2011
Location: nondum cognita
Boat: sailboat
Posts: 3,077
Re: Lichtenberg Figures

Found a picture of a boat bottom that looks similar except we had thousands of them all over and they were smaller and had little divots taken out of the gel coat in the center. Boat was a racer that had a balsa core below the waterline that was wet which may have been a factor.
Attached Thumbnails
Click image for larger version

Name:	image.jpeg
Views:	81
Size:	21.3 KB
ID:	130281  
__________________
Delancey is online now   Reply With Quote
Old 29-08-2016, 21:19   #5
Registered User
 
Delancey's Avatar

Join Date: Oct 2011
Location: nondum cognita
Boat: sailboat
Posts: 3,077
Re: Lichtenberg Figures

The whole night was cloud to cloud strikes that would light up the entire sky. We didn't get zapped until the next morning when things had mellowed out. I was on deck driving the boat under power in the drizzling rain. Felt like the boat was lifted verticaly out of the water. Was very strange.
Attached Thumbnails
Click image for larger version

Name:	image.png
Views:	69
Size:	246.3 KB
ID:	130283  
__________________
Delancey is online now   Reply With Quote
Old 30-08-2016, 09:20   #6
Registered User

Join Date: Feb 2014
Posts: 759
Re: Lichtenberg Figures

Thanks for sharing - I read that they are tempoary and disipate over months.

I wonder if lightning damage to boats are also temporary....NOT!!!



Sent from my SM-G360V using Cruisers Sailing Forum mobile app
__________________
tuffr2 is offline   Reply With Quote
Old 30-08-2016, 09:36   #7
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 15,577
Re: Lichtenberg Figures

Amazing. Very interesting. New to me.

THX for sharing,
b.
__________________
barnakiel is offline   Reply With Quote
Old 14-09-2016, 09:24   #8
Registered User

Join Date: May 2012
Posts: 459
Re: Lichtenberg Figures

I was witness to a lightning strike to a boat that was only a few years old so you would not think there was moisture absorption and all the hull damage was from waterline to about 2 feet above waterline .The gelcoat looked like old cracked paint and had fiber glass fiber sticking out of every crack
Also saw a car that was struck while driving, the initial strike hit the windshield which melted a glob of glass and left the safety layer looking like he images posted earlier and killed every component that had an IC chip
NO rules for lightning!
__________________
sartorst is offline   Reply With Quote
Old 14-09-2016, 15:34   #9
Registered User

Join Date: Jan 2011
Location: Sydney
Boat: Compass 28
Posts: 164
Re: Lichtenberg Figures

Quote:
Originally Posted by sartorst View Post
I was witness to a lightning strike to a boat that was only a few years old so you would not think there was moisture absorption and all the hull damage was from waterline to about 2 feet above waterline .The gelcoat looked like old cracked paint and had fiber glass fiber sticking out of every crack
Also saw a car that was struck while driving, the initial strike hit the windshield which melted a glob of glass and left the safety layer looking like he images posted earlier and killed every component that had an IC chip
NO rules for lightning!
One rule to understand lightning - It is fundamentally Lazy!. It has had a hard life getting somewhere and it wants an easy life from there on.
Seriously, it is a good way to think. If a conductor has a bend in it, life could be easier to jump the corner. If the conductor is directly connected to an HF radio grounding plate, with large cable and no sharp bends then it will be unlikely to cause much heat damage. Make it work by squeezing through a tight space, round sharp corners, or simply ending the conductive path short of the ground and - Lo and Behold, the energy vents its anger, it takes its toll.
__________________
Djarraluda is offline   Reply With Quote
Old 15-09-2016, 05:04   #10
Registered User
 
double u's Avatar

Join Date: Feb 2016
Posts: 341
Re: Lichtenberg Figures

Quote:
Originally Posted by sartorst View Post
I was witness to a lightning strike to a boat that was only a few years old so you would not think there was moisture absorption and all the hull damage was from waterline to about 2 feet above waterline .The gelcoat looked like old cracked paint and had fiber glass fiber sticking out of every crack
Also saw a car that was struck while driving, the initial strike hit the windshield which melted a glob of glass and left the safety layer looking like he images posted earlier and killed every component that had an IC chip
NO rules for lightning!
so much for "faradayan cage"...
__________________
double u is offline   Reply With Quote
Old 15-09-2016, 06:32   #11
Registered User

Join Date: Feb 2014
Posts: 759
Re: Lichtenberg Figures

Earlier I just wrote thanks for sharing...I meant to say Wow, thank you very much for sharing the name of this phenomenal event. I think everyone has had electronics of some kind fried by lightning. And some had lighning hit close. I pay attention more to articles about lighning. Like 300 raindeer killed by lightning about a month ago.

One of many things that I do not understand is houseboats and lighning. There are thousands of houseboats on lake and I never heard of them getting hit by lighning.

Always heard get off the water during a storm. I saw a few dozen houseboat trying to leave the dock before a storm started. So they were not worried about getting off the water.

Anyone get hit by lighning on a houseboat?



Sent from my SM-G360V using Cruisers Sailing Forum mobile app
__________________

__________________
tuffr2 is offline   Reply With Quote
Reply

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
Load Diagrams / Figures Toothless General Sailing Forum 0 06-02-2013 09:45
Linear Actuator Load Figures for Autopilot aboutgone Auxiliary Equipment & Dinghy 4 30-04-2010 21:57


Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:24.


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.