Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 23-01-2015, 17:04   #16
Registered User
 
markpierce's Avatar

Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,413
Re: New lightning stats from BoatUS Insurance

Would a lightning rod be helpful in reducing damage if not the risk of a strike?:


__________________

__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 23-01-2015, 17:17   #17
Registered User

Join Date: Sep 2010
Location: Halifax
Posts: 435
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by colemj View Post
For example, multi's are twice as likely to get struck overall than monos, but the percentage of all multis <40' is very low, while the percentage of all mono's <40' is very high. Yet overall, boats >40' are 3x more likely to be struck than boats <40'.

Difficult to see the above relationships being coincidental.

Mark
God has made his choice.



__________________

__________________
Brob2 is offline   Reply With Quote
Old 23-01-2015, 17:28   #18
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by markpierce View Post
Would a lightning rod be helpful in reducing damage if not the risk of a strike?:
Well first, look at DotDun's map. I don't think you need to worry about lightning - rod or no rod.

Second, the purpose of a rod is to direct the strike to something that can carry it to ground. It is not designed to reduce the probability of a strike. So if yours is connected to an appropriate conductor that is terminated in an appropriate ground, then it may help to reduce damage.

Third, for a lightning rod to be useful at all, it must be the highest point. You have antenna higher than it.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 23-01-2015, 17:36   #19
Registered User
 
markpierce's Avatar

Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,413
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by colemj View Post
Well first, look at DotDun's map. I don't think you need to worry about lightning - rod or no rod.

Second, the purpose of a rod is to direct the strike to something that can carry it to ground. It is not designed to reduce the probability of a strike. So if yours is connected to an appropriate conductor that is terminated in an appropriate ground, then it may help to reduce damage.

...
The mast rests on a fiberglass roof, but the seven guy wires lead to a steel hull.

The lightning rod is sharper/more pointed than the antennae.
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 23-01-2015, 17:42   #20
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by markpierce View Post
The lightning rod is sharper/more pointed than the antennae.
But it is not higher.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 23-01-2015, 17:48   #21
Registered User
 
markpierce's Avatar

Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,413
Re: New lightning stats from BoatUS Insurance

Oh well. A VHF radio is cheap compared to an overall lightning strike.
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 23-01-2015, 18:02   #22
Registered User
 
Ziggy's Avatar

Join Date: Apr 2008
Location: U.S., Northeast
Boat: Contessa 32
Posts: 1,421
Images: 2
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by colemj View Post
That would make sense only if the number of multis in lower latitudes were twice the number of monos. I don't think this is the case.
The statistics given in terms of strikes per 1000 boats, not the absolute number of strikes. So if most multis are in Florida, while the monos are more evenly distributed up and down the eastern seaboard, the multis will have a higher odds of getting hit. That may not be the whole story, but I think it is a part of the explanation.

Quote:
Originally Posted by colemj View Post
BTW, while FL may be the lightning capital of the USA, I can assure you that it is not that of the world! We have been in places that Floridians there cannot believeÖ
Good point. I don't know where the highest incidence of lightning is on the globe. Florida is the highest in the U.S.
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
Ziggy is offline   Reply With Quote
Old 23-01-2015, 18:19   #23
Registered User
 
LeaseOnLife's Avatar

Join Date: Apr 2008
Location: out cruising again
Boat: Sailboat
Posts: 1,046
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by Ziggy View Post
...I don't know where the highest incidence of lightning is on the globe.
this looks like a winner:
Catatumbo lightning - Wikipedia, the free encyclopedia

http://www.weather.com/news/news/eve...tning-20140201

Not many cruisers there, if any. I'd like to see it, but not from a boat.

Dirk
__________________
LeaseOnLife is offline   Reply With Quote
Old 23-01-2015, 18:24   #24
Registered User

Join Date: Jun 2007
Location: SW Florida
Boat: FP Belize, 43' - Dot Dun
Posts: 3,423
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by markpierce View Post
Oh well. A VHF radio is cheap compared to an overall lightning strike.
Problem is it won't stay in the VHF/antenna/coax/radio....it'll jump out to something else, then something else, then something else, then something else, and maybe find ground.
__________________
DotDun is online now   Reply With Quote
Old 23-01-2015, 18:45   #25
Sponsoring Vendor
 
groundtackle's Avatar

Community Sponsor

Join Date: Aug 2013
Location: Victoria BC/ Same
Boat: Cal 2-46 / Le Comte 35'
Posts: 369
Re: New lightning stats from BoatUS Insurance

What do this stats mean? Strikes per 1000 what? Boats? Lightening Storms? Years?
We need context to Jane meaning



Sent from my iPhone using Cruisers Sailing Forum
__________________

Ground Tackle Marine offers the highest quality ground tackle products to discerning clients. We are the only North American distributor of the Excel and Sarca anchors manufactured by Anchor Right Australia. Contact us through our website www.groundtackle.com
Chris or Nick will be pleased to help whatever your ground tackle questions are.
groundtackle is offline   Reply With Quote
Old 23-01-2015, 18:47   #26
Sponsoring Vendor
 
groundtackle's Avatar

Community Sponsor

Join Date: Aug 2013
Location: Victoria BC/ Same
Boat: Cal 2-46 / Le Comte 35'
Posts: 369
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by nshawdvm View Post
What do this stats mean? Strikes per 1000 what? Boats? Lightening Storms? Years?
We need context to Jane meaning



Sent from my iPhone using Cruisers Sailing Forum

God I hate spell checkers


Sent from my iPhone using Cruisers Sailing Forum
__________________

Ground Tackle Marine offers the highest quality ground tackle products to discerning clients. We are the only North American distributor of the Excel and Sarca anchors manufactured by Anchor Right Australia. Contact us through our website www.groundtackle.com
Chris or Nick will be pleased to help whatever your ground tackle questions are.
groundtackle is offline   Reply With Quote
Old 23-01-2015, 20:08   #27
Registered User

Join Date: Jun 2007
Location: SW Florida
Boat: FP Belize, 43' - Dot Dun
Posts: 3,423
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by nshawdvm View Post
What do this stats mean? Strikes per 1000 what? Boats? Lightening Storms? Years?
We need context to Jane meaning



Sent from my iPhone using Cruisers Sailing Forum
Hmm, let's try this.....from the BoatUS article....

Quote:
about one in a thousand boats has a lightning claim each year.
So maybe they mean that for every 1000 multihulls, 6.9 get struck by lightning each year.....????

Is that the context you're looking for??
__________________
DotDun is online now   Reply With Quote
Old 24-01-2015, 06:57   #28
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by markpierce View Post
Oh well. A VHF radio is cheap compared to an overall lightning strike.
Here is how that works (this is from direct experience of having our VHF antenna take a strike): The lightning hits the antenna, travels down the coax to the radio, jumps onto the negative side of your DC system and proceeds to take out anything and everything connected to your DC system until it finds its way out through your DC bond to water (typically through the engine). You will lose not only the electronics, but your alternator, windlass, possibly starter, fridge, inverter - where it may jump over to your AC side and start wreaking havoc there, etc.

It can become very expensive in milliseconds after hitting the VHF.

But put this in perspective - how many close lightning storms are you experiencing in SF Bay area? For comparison, in Panama these occur every night and often in the day for 6 months of the year.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 24-01-2015, 07:00   #29
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: New lightning stats from BoatUS Insurance

Quote:
Originally Posted by Ziggy View Post
The statistics given in terms of strikes per 1000 boats, not the absolute number of strikes. So if most multis are in Florida, while the monos are more evenly distributed up and down the eastern seaboard, the multis will have a higher odds of getting hit. That may not be the whole story, but I think it is a part of the explanation.
Well then in addition to parsing the data by LOA, it would be good to see the data presented by area. I would be interested if monos in FL are struck at the same rate as multis, for instance.

I know from direct personal experience of ~30 boats hit by lightning in Panama that there is no difference in hit rate between mono and multi. Even when adjusting for the numbers of each type. However, that is definitely not a large enough sample to draw any conclusion.

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 24-01-2015, 07:10   #30
cruiser

Join Date: Jan 2012
Location: Ocean Springs, MS
Posts: 279
Re: New lightning stats from BoatUS Insurance

I'd like to see the data filtered from the perspective of how expensive multihulls are than monohulls are (alluded to earlier).

Ergo I'd suggest that: given that multihulls in general are more expensive than monohulls, that the multihull owner is more likely to file a claim than the less-vested monohull owner. Similar to the length argument, the data may be skewed thusly
__________________

__________________
jaybird1111 is offline   Reply With Quote
Reply

Tags
insurance, 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
Check out CF Site Stats! drew.ward Forum Tech Support & Site Help 8 30-05-2009 19:57
Boatus Insurance Wildrice Off Topic Forum 5 09-06-2008 12:34
Looking for cruising stats sneuman Cruising News & Events 2 15-04-2008 13:43
Fla. Hurricane Stats GordMay Atlantic & the Caribbean 10 31-12-2007 04:10



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:01.


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.