[MHml] Fw: Carbon and Spectra Rig

[Ross Hobson]

lightening stikes... now how often does that occur?

we spent 48hrs in a full lightening stom on the edge of hurricane Bonnie in 2003, pitch black all the time - i was even able to photograh the ligtening on a 'snap' camera... saw lots of stikes hitting the water and could smell the ozone, but no sign of it hitting the 20m carbon rig...maybe the soft rigging acts as an insulator??

i have seen the results of lightening hitting an ally mast and it was trashed... so no difference b/n carbon and ally 

Ross



________________________________________
From: multihulls-bounces at steamradio.com [multihulls-bounces at steamradio.com] On Behalf Of Bill Gibbs [BillG at GibbsCAM.com]
Sent: 14 April 2009 19:05
To: 'Informed discussion of multihull issues'
Subject: Re: [MHml] Fw:  Carbon and Spectra Rig

Couldn't a lightning strike anneal the aluminum mast from generated heat
well below melting points?
Normal mast material would have been heat treated to a T6 condition for max
strength, I would guess.
This would weaken it invisibly.

Bill
Afterburner




-----Original Message-----
From: multihulls-bounces at steamradio.com
[mailto:multihulls-bounces at steamradio.com] On Behalf Of Randy Devol
Sent: Tuesday, April 14, 2009 10:55 AM
To: Informed discussion of multihull issues
Subject: Re: [MHml] Fw: Carbon and Spectra Rig

A little behind here...

Other folks covered the Spectra rigging issues.

No one mentioned my biggest concern with the Carbon mast: lightening
strikes.  Once the mast has been hit, you may not be able to tell the
extent of the damage.    The heat can burn the epoxy matrix holding
the carbon together in ways and in places that are very hard to find.

With an Al. mast, the electronics may be toast, some fittings may
have to be replaced, but the mast itself will be just as strong as
before the strike.  Or, if the strike did damage the mast, the damage
will be quite evident.  There will be no mystery.

-=O=- Randy

>Re: What did you tell her
>
>Hi Carlo,
>I told her that either rig would perform just fine and that she must
>understand the different maintenance requirements and if she wanted
>to sell the boat in a year, many owners would be leery of
>the synthetic rig and a very few would prefer it, but that ratio
>would probably improve as time went on.  I said if I was buying the
>boat, I would prefer the syn rig because I could make easy repairs
>myself.
>
>jam
>
>
>
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