Re: Boom choices

From: George Linke (golink@sirius.com-DeleteThis)
Date: Tue May 11 1999 - 22:36:25 PDT

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Message-Id: <3.0.5.32.19990511223625.007b7a70@pop.sirius.com-DeleteThis>
Date: Tue, 11 May 1999 22:36:25 -0700
To: wind_talk@opus.hpl.hp.com-DeleteThis
From: George Linke <golink@sirius.com-DeleteThis>
Subject: Re: Boom choices
In-Reply-To: <3738940D.6FBA@cup.hp.com-DeleteThis>
Content-Type: text/plain; charset="us-ascii"

What do you do if both sides of the boom arms fail?

I just had another boom failure with an aluminum front end Windsurfing
Hawaii boom. This time the failure was in the straight portion of the
aluminum inside the plastic boom clamp. The aluminum appeared to fail due
to fatigue as I could not see any corrosion. The problem was that both boom
arms slid out of the clamp so that I was unable to rescue myself. We all
know how to self rescue when only one side of the boom is broken, namely by
reverse mounting it to sail in the reverse direction. But what do you do
when both sides fail? In hindsight I thought about how I could have rigged
a self rescue and this is what I would do if it happened again. Tie the two
broken boom arms together with one of the harness lines. The harness line
would also have to be attached to the mast or remaining boom clamp.
Alternately I could just attach one of the two the broken arms to the mast
with a harness line. I have not tried this but it should work assuming the
boom rear end is still ok. If the boom rear end were also broken I would
try to tie the broken pieces together with a line.

To do all this repair would take at least half hour and if this failure
happened in the middle of the Crissy ebbing channel I would be outside the
gate by now, assuming a tanker has not run me over.

So I guess my next boom will be the best money can buy.

At 01:48 PM 5/11/99 -0700, you wrote:
>> Aluminum (like most anything else) can either
>> be a cathode or an anode, depending on what type of electrochemical
>> cell you've got.
>
>
>This is consistent with what the Fibrespar sales rep told me last year.
>He said aluminum and carbon cause electrolysis. The breaking problem was
>fixed by putting a healthy layer of resin between the carbon arms and
>the aluminum in the head joint.
>
> - John Morris
>
>

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