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Old 18-06-2021, 13:06   #1
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Lighting strike likelyhood

Apparently multihulls not only capsize but they are struck by lightning as well - almost twice as frequently as monohulls.

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https://www.boatus.com/expert-advice...k-by-lightning
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Old 18-06-2021, 13:12   #2
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Re: Lighting strike likelyhood

Nowhere do I see mention of capsize with respect to multihulls anywhere in that article. Perhaps you are making up your "facts"?
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Old 18-06-2021, 14:10   #3
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Re: Lighting strike likelyhood

Monohulls are known to sink. Maybe the numbers are of because some monohulls sink due to lightning strikes?
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Old 18-06-2021, 15:33   #4
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Re: Lighting strike likelyhood

Ignoring the trolling comment about sinking, that is a useful link to one of the few articles that actually gives solid data on lightning risk. The best explanation I have heard for the difference quoted is if we assume lightning is essentially random as to where it strikes, then a catamaran with roughly twice the footprint of a monohull will be roughly twice as likely to be struck. Though I don't think it references it in that article, the data is from Florida where most insured boats are packed in marinas where that would be consistent. The data is also consistent with other findings that there is nothing reliable you can do to prevent a strike if you are in a lightning area, but that you can mitigate the damage if you do get struck by providing a "safe" path to earth, though it doesn't prove that either way.
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Old 18-06-2021, 15:43   #5
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Re: Lighting strike likelyhood

Quote:
Originally Posted by mark_morwood View Post
Ignoring the trolling comment about sinking, that is a useful link to one of the few articles that actually gives solid data on lightning risk. The best explanation I have heard for the difference quoted is if we assume lightning is essentially random as to where it strikes, then a catamaran with roughly twice the footprint of a monohull will be roughly twice as likely to be struck. Though I don't think it references it in that article, the data is from Florida where most insured boats are packed in marinas where that would be consistent. The data is also consistent with other findings that there is nothing reliable you can do to prevent a strike if you are in a lightning area, but that you can mitigate the damage if you do get struck by providing a "safe" path to earth, though it doesn't prove that either way.


Do you know what an emoji is? Notice the smiley faced emoji used at the end of my post, that means it was meant in humor.
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Old 18-06-2021, 15:51   #6
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Re: Lighting strike likelyhood

I would suspect that the average cat has a much taller stick than an average monohull.

Now we assume the average lightning will seek the highest most conductive path we can pull average boat grouping in anchorages into play......

Wait.......no we canít, itís lightning.

Insurance stats only count fully insured boats. If we got hit, Iíd be rebuilding out of pocket and not adding to the stat.
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Old 18-06-2021, 15:58   #7
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Re: Lighting strike likelyhood

Roxy, monohull, 80 foot air draft main mast, struck three times since we have owned the boat.
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Old 18-06-2021, 16:01   #8
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Re: Lighting strike likelyhood

ď6.9 or 3.8 chances per thousand.Ē

Per thousand what?
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Old 18-06-2021, 16:02   #9
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Re: Lighting strike likelyhood

Quote:
Originally Posted by ChrisJHC View Post
ď6.9 or 3.8 chances per thousand.Ē

Per thousand what?


6.9 catamarans out of a thousand and 3.8 monohulls out of a thousand are struck by lightning.
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Old 18-06-2021, 16:26   #10
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Re: Lighting strike likelyhood

Think about where most multihulls are found.

In regions where strong thunderstorms are prevalent.

This skews the data just a tad.
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Old 18-06-2021, 16:32   #11
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Re: Lighting strike likelyhood

Quote:
Originally Posted by C420sailor View Post
Think about where most multihulls are found.

In regions where strong thunderstorms are prevalent.

This skews the data just a tad.
?????? Huh?

Great Lakes, many summer violent storms, near zero cats

Caribbean (lived aboard 5 years now) 50% cats and no electric storms in five cruising seasons.

It would certainly be interesting to add in the regional data too. Only compare monos and cats strike rates in similar areas and times.
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Old 18-06-2021, 16:41   #12
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Re: Lighting strike likelyhood

Florida has a lot of cats, and they get crushed by storms.

I’m not speaking in absolutes, my point is that the data isn’t corrected for location.
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Old 18-06-2021, 16:45   #13
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Re: Lighting strike likelyhood

Quote:
Originally Posted by C420sailor View Post
Florida has a lot of cats, and they get crushed by storms.

Iím not speaking in absolutes, my point is that the data isnít corrected for location.


How do cats get crushed by storms?
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Old 18-06-2021, 16:55   #14
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Re: Lighting strike likelyhood

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How do cats get crushed by storms?
Florida gets crushed by storms. Sorry for being unclear.
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Old 18-06-2021, 17:12   #15
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Re: Lighting strike likelyhood

Quote:
Originally Posted by C420sailor View Post
Florida gets crushed by storms. Sorry for being unclear.


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