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just a question....

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(@Anonymous 6797)
Posts: 31
Topic starter
 
[#16112]

today i was catch on the sea from an heavy rain...
what's happens if a lighting hit the mast of my hobie during a sail ?


 
Posted : August 28, 2005 1:15 pm
(@wineboy)
Posts: 263
Mate Registered
 

You may never need Viagra.


 
Posted : August 28, 2005 7:18 pm
(@Anonymous 14944)
Posts: 989
 

You can do away with navigation lights at night for two reasons 1. You will probably "glow in the dark" and 2. You may not be around to worry about it.
On a more serious note, lighting strikes on cats are not a common occurrence (although it does happen) and of the two times over 45 years of continuous sailing that I have been witness to such an event, both sailors came away "shaken" but relatively unharmed otherwise. Their masts on the other hand were "history".
The mast to the water "seems" to create a good "conduit" for the lightening to travel without causing an enormous amount of peripheral damage.
The two times that I witnessed actual strikes on cats, at both times the skippers had their aluminium tiller extensions trailing in the water which could have created an “earth” for the lightning. There is a lot of conjecture that when a cat is NOT “grounded” the mast acts as a repellent to any strike as the charge emanating from the top of the mast is the same as that of the lightning and repels it (or visa versa). I tend to agree with the hypothesis, as I have witnessed many, many, times cats sailing when there have been many strikes on the water around them but with no direct “hits” to the cats.
Carbon fibre boats and mast are a little disconcerting to me now though as carbon is such a very, very, good conductor of electricity.


 
Posted : August 28, 2005 8:04 pm
Nick
 Nick
(@hobienick10)
Posts: 306
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Carbon may be a very good conductor, but the resin that binds the carbon fiber togeather is not.


 
Posted : August 29, 2005 7:01 am
(@kbcatman)
Posts: 1444
Master Chief Registered
 

From a University of Florida study - no statistically significant difference between grounded and ungrounded boats regarding the likelyhood of getting struck. Huge difference in the damage done once struck, with ungrounded boats taking the brunt.


 
Posted : August 29, 2005 8:28 am
Jake Kohl
(@jake)
Posts: 11744
Three Star Admiral Registered
 

Hey...now there's something.

I guess I need to reconnect the grounding wire to my keel on my monoslug.


 
Posted : August 29, 2005 8:37 am
(@kbcatman)
Posts: 1444
Master Chief Registered
 

Here's the paper. A little old, but interesting nonetheless.

http://www.thomson.ece.ufl.edu/lightning/

Lightning Study


 
Posted : August 29, 2005 8:42 am
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