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Old 03-07-2015, 10:56   #1
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"Detuning" rig


We are going to be decommissioning the boat for about a year, maybe two, while we work and save up money for a bunch of improvements we would like to make to the boat. Unfortunately, we had a great time on our 1.5 year shake down cruise but now its time to put our time in and get the boat in the shape we want it before heading out on a much longer trip.

I was wondering if it is wise to detune or loosen the rigging slightly to help extend out its lifetime while we are here in the slip...

We plan on getting a rigger back on the boat before we head out again to tune the standing rigging.

Thoughts or experiences?

- z

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Old 03-07-2015, 10:59   #2
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Re: "Detuning" rig

If you're staying in the water, the boat rocks. Keep the rig tuned. It'll stretch some over time anyway. Good luck on the upgrades.

Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
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Old 03-07-2015, 17:17   #3
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Re: "Detuning" rig

Dont, the rigging should stay tuned if you leave the boat for a while, if you slack the shrouds shock loads do more harm than tensioned shrouds ...
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Old 03-07-2015, 20:30   #4
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Re: "Detuning" rig

The rigging is trying to deform the hull. Old wooden boats would actually pull the center of hull upwards and/or compress the deck inward from the strain of the rigging. FRP is more resistant to this than wood but still happens especially if the rigging is kept bar taut. Loosen the rigging to the point just before it begins to sag off. Without any sails and sitting in a slip or on the hard, the rigging will not be subjected to the strain put on it sailing. Likewise there will be no shock loads as the wind resistance of the bare stick will be the only force the rigging has to cope with. No need to try/succeed in deforming the hull when the boat is not being used.
Peter O.
'Ae'a Pearson 35
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Old 03-07-2015, 21:36   #5
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Re: "Detuning" rig

Bungees between shrouds can prevent shock loads. Some riggers recommend this as a standard practice to prevent shock loads on slackened leeward shrouds.

Cyclical shock loads can be a significant cause of failure. Example: after repeat failure of bolts on the superstructure of a trombe wall on the exterior of our building, analysis determined the cause to be from the constant relatively small shock loads from truck tires hitting the expansion joints on the nearby elevated freeway.
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