Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 22-09-2014, 09:12   #46
Registered User
tomfl's Avatar

Join Date: Apr 2012
Location: Florida
Boat: Seawind 1000xl
Posts: 1,982
Images: 10
Re: Lightning Strikes and Cats

Originally Posted by DotDun View Post
The problem with lightning is the range of voltage, hence damage, can be from 10v to 10,000,000v (or higher).

Yes, lightning arrestors help on the lower voltages strikes (or side flashes), but a direct strike with millions of volts of potential will burn anything in it's path. There is no failsafe protection from lightning, it's simply too variable. Statistically, using arrestors and mechanisms to help get the bulk of the current off the boat in a direct path has helped, but it's very hard to measure the level of 'help' with the variability between the power of each lightning strike.

A common belief is to provide a direct and short path from the mast to the water. The goal is to get as much of the current off the boat quickly. It's generally accepted that you'll lose the electronics, but the goal is to save the fiberglass. Lightning will follow the fiberglass if that's the only way to ground, when it does this, it can burn open cracks of 2" or more. Not good when that happens below the waterline.
Best post of the thread.

At some point no system will be able to deal with big lighting strikes. Doing a cost/benefit analysis is almost impossible because the size of the lighting is so variable.

Not saying some precautions are not a good idea, just saying expectations need to be realistic.

tomfl is offline   Reply With Quote
Old 22-09-2014, 09:23   #47
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,736
Re: Lightning Strikes and Cats

Originally Posted by colemj View Post
That is a common misbelief that has caused many to keep their boats ungrounded. However, there is no statistical evidence to support it, and all standards bodies recommend grounding for lightning safety.


It is a shame this fallacy stops people grounding their boats.

The consensus is that a ground boat is slightly less likely to get hit. This is because the grounding also dissipates the build up of static charge at the masthead. The effect is slight and the real benefit of grounding is to reduce the damage if you do get hit.

noelex 77 is offline   Reply With Quote


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 strikes/ avoiding them? s/vAngel Construction, Maintenance & Refit 81 04-08-2015 18:48
Lightning strikes, sail drives and insurance sak54757 Multihull Sailboats 0 15-08-2013 09:27
Junk Rig and Lightning Strikes Rhoel_Asia Health, Safety & Related Gear 2 10-11-2009 06:35

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:42.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.