Received: from hplms26.hpl.hp.com by opus.hpl.hp.com with ESMTP (1.37.109.18/15.5+ECS 3.3+HPL1.1) id AA256247038; Wed, 8 Oct 1997 11:57:18 -0700 Return-Path: <hangtime@elnino.engr.sgi.com-DeleteThis> Received: from sgi.sgi.com (SGI.COM [192.48.153.1]) by hplms26.hpl.hp.com (8.8.6/8.8.6 HPLabs Relay) with SMTP id LAA23357 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Wed, 8 Oct 1997 11:57:19 -0700 (PDT) Received: from cthulhu.engr.sgi.com (cthulhu.engr.sgi.com [192.26.80.2]) by sgi.sgi.com (950413.SGI.8.6.12/970507) via ESMTP id LAA19845 for <@sgi.engr.sgi.com:wind_talk@opus.hpl.hp.com-DeleteThis>; Wed, 8 Oct 1997 11:53:16 -0700 env-from (hangtime@elnino.engr.sgi.com-DeleteThis) Received: from elnino.engr.sgi.com (elnino.engr.sgi.com [198.29.104.45]) by cthulhu.engr.sgi.com (950413.SGI.8.6.12/960327.SGI.AUTOCF) via ESMTP id LAA06754 for <@cthulhu.engr.sgi.com:wind_talk@opus.hpl.hp.com-DeleteThis>; Wed, 8 Oct 1997 11:53:07 -0700 Received: (from hangtime@localhost) by elnino.engr.sgi.com (940816.SGI.8.6.9/960327.SGI.AUTOCF) id LAA06372 for wind_talk@opus.hpl.hp.com-DeleteThis; Wed, 8 Oct 1997 11:53:48 -0700 From: "Chris Rowe" <hangtime@elnino.engr.sgi.com-DeleteThis> Message-Id: <9710081153.ZM6370@elnino.engr.sgi.com-DeleteThis> Date: Wed, 8 Oct 1997 11:53:46 -0700 In-Reply-To: Ed Scott <edscott@best.com-DeleteThis> "Lost Rig at Third - 10/6/97" (Oct 8, 11:12am) References: <199710081726.KAA28640@scv2.apple.com-DeleteThis> X-Mailer: Z-Mail-SGI (3.2S.2 10apr95 MediaMail) To: wind_talk@opus.hpl.hp.com-DeleteThis Subject: Re: Tendon U-joints Content-Type: text/plain; charset=us-ascii
> I'm changing my tendon u-joint and rope at least once a season now. =
> Mine was two seasons old. Although there were no visible cracks, I =
> guess fatigue got to it. I noticed that ASD carries them. Another =
> hard (and expensive) lesson learned.
>
> -Ed Scott
I think this is actually a problem with all the old-style tendon bases,
regardless of how much they have been used. The cup at each end of the
tendon is made out of plastic on the older ones, not metal like the
most recent edition.
The reason this is bad is when you land a big jump, especially if you land
flat, there is a LOT of force compressing that tendon lengthwise. As
it gets shorter, it gets fatter, and my opinion is that it can get so
fat that it bursts the plastic cup that holds its end.
I had this happen to me once,
when, after sailing on a day that I made a couple of super-jarring
flat landings, I noticed that half the cup on one end of the tendon was
missing. Unfortunately the anchor hole for the safety-rope had also
gotten blown off, and I was just super-lucky that the anchor pin, which was now
only supported on one end, somehow held the tendon's end in what was left of
the cup, saving me a long swim.
The new bases have metal cups, presumably to fix this problem with stronger
material.
I'm bummed to hear of all the mishaps monday. This has got to be the
most dangerous sports other than sky diving without a parachute.
Cheers and safe sailing,
Chris.
-- Chris Rowe ASD Product Design 415-933-8732
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