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Subject: Re: [worldcruising] Rigging & Tension
From: Harry W. James (welshman@XXX.XXX)
Date: Wed Jul 17 2002 - 02:42:17 EDT
Brion Toss states that galvanized rigging that is served and maintained
should last 50 Years. I have read of a lot of stainless steel failures
in boats.
HJ
Barry Brazier wrote:
>
> I don't believe it is possible to see signs of immanent failure in SS rigging. The main cause of failure is fatigue caused by constant vibration of the rig. This occurs even while at the moorings. I have seen apparently sound SS wire break when 10 YO. I have lost a mast for the same reason. I always now replace before 10 years. Think 7years is the safe limit for wire and longer for fittings. Fittings don't deform as much and therefore have less fatigue.
> This applies to all SS fittings that have varying loads. I recently had my rudder blade break loose from the rudder shaft due to fatigue at the junctions were the SS fingers in the blade are welded to the shaft inside the fibre glass covering.
> SS is fatigues faster than non stainless steel I would expect 20 years from galve fittings. The problems with them is corrosion.
> I have found a good way to tension the rig of a cruising boat is to sail on a fine reach in 15 kt wind so that the rigging on the leeward side is slack. I then tighten that lee rigging to take up the slack.
> Then go about and do the same on the other side. This works for a single spreader rig.
>
> Regards
>
> Barry
>
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