Received: from opus.hpl.hp.com by jr.hpl.hp.com with ESMTP (1.37.109.24/15.5+ECS 3.3+HPL1.1) id AA289033602; Mon, 10 May 1999 15:00:03 -0700 Return-Path: <bjames@exponent.com-DeleteThis> Received: from hplms26.hpl.hp.com by opus.hpl.hp.com with ESMTP (1.37.109.24/15.5+ECS 3.3+HPL1.1) id AA192793600; Mon, 10 May 1999 15:00:00 -0700 Received: from menlomail.exponent.com (unknown-107-17.exponent.com [198.70.107.17]) by hplms26.hpl.hp.com (8.9.1a/HPL-PA Relay) with ESMTP id PAA17108 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Mon, 10 May 1999 15:00:00 -0700 (PDT) Received: by MENLOMAIL.exponent.com with Internet Mail Service (5.5.2232.9) id <HH966PR7>; Mon, 10 May 1999 14:57:26 -0700 Message-Id: <6717C84A8642D2119F1700A0C9D5D9F40C5FB0@MENLOMAIL.exponent.com-DeleteThis> From: Brad James <bjames@exponent.com-DeleteThis> To: "'wind_talk@opus.hpl.hp.com-DeleteThis'" <wind_talk@opus.hpl.hp.com-DeleteThis> Subject: RE: Boom choices Date: Mon, 10 May 1999 14:57:26 -0700 X-Mailer: Internet Mail Service (5.5.2232.9) Content-Type: text/plain; charset="iso-8859-1"
No question that you are going to have much less of a corrosion issue for
aluminum in fresh water vs. salt water, so I'd say yes, religious fresh
water rinsing of Al booms should extend their life (if you sail in salt
water). The chlorides in saltwater break down the protective oxide film
that Al naturally forms, thereby increasing corrosion rates.
By the way, the big problem with early Fiberspar booms was the aluminum
fitting they used to attach the carbon arms to the head. This Al lug would
corrode and fail. What Fiberspar did was to make the booms more
water-tight, and to beef up the Al lug so that you have lower stresses and
would have to corrode much more material to get to the breaking point.
Their new all-carbon head booms are probably an even better idea.
Brad
(metallurgist at large)
-----Original Message-----
From: Scott Winkler [mailto:scottw@force4.com-DeleteThis]
Sent: Monday, May 10, 1999 2:34 PM
To: Multiple recipients of list
Subject: Re: Boom choices
I broke a total of 4 fiberspar booms starting a couple of years ago across
2 seasons, and fiberspar/asd stood behind them. My last one, now in its 3rd
season is holding up well; been out in surf. I am looking for to replace
an ancient windsurf hawaii for small sails. Not necessarily sold on
carbon; in sub-5.0 conditions (195lbs) I'm frankly not that concerned w/
weight and speed. Does religious fresh water rinsing of alum boom help the
corrosion problem?
Scott Winkler
200#, ASD, North Spectra
650 917-9674
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