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  #1  
Old 10-01-2001
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storage, mast up

I,ve often wondered how critical it is to winter store your boat with the mast up. i do and when i''ve been on the boat I notice on windy days the mast will shake causing the entire boat to vibrate and or rock with the mast motion.

It''s been that way for several years and seems to come through the winter ok.

Is this normal and has anyone experienced the same sensation. I''ve always been concerned on whether or not it would cause damage.
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Old 10-01-2001
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storage, mast up

Ultimately all metals will crystalize (work harden) under cyclic loading (vibrations) conditions. However there is an endurance limit (number of cycles per a specific value of stress applied) that if you keep the cumulative values of stress BELOW this value, the embrittlement does not occur. I have absolutely no idea where one can find the endurance limit on swaged rigging connections.
The good news is that winter time temperatures will dimensionally shrink the mast more than the rigging, thus stress unloading the entire system.
In all probablility, unless your rig is very tight to begin with (20%+ of the ultimate breaking strength) there is probably no significant adverse cyclic stress loading due to wintertime vibrations etc. ....... Just my stress educated opinion. I keep my masts up, visually inspect yearly from a bosuns chair, and do an on-the-ground thorough dye penetrant/magnaflux inspection every 4 years.
The way to reduce the vibration is to change the mass of the system, etc. by taking halyards, etc. and spiraling them around the shrouds, mast, etc.
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Old 10-02-2001
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storage, mast up

Boy am i getting an education. This is great. I never thought of it that way I was concerned about stress on the hull, keel, and
the fiberglass stress itself. Now I am going to worry about the rigging too. Only kidding. I do put extra poppets just to be safe.

My nervouseness is probalby due to the boat not being where it should be, in the water where I can use it.

Thanks, this message board is great.
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Old 10-02-2001
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storage, mast up

A notable side-effect of having your mast unstepped every year is the necessary inspection and adjustment of the standing rigging, which generally happens when the mast is stepped the following spring.

I would recommend that you do the same, at least this year. I''ll bet your rig stops shaking.
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Old 10-02-2001
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storage, mast up

Everything in the universe is degrading and decrepitating into its lowest state - entropy. Sailors seem to have the ability to enjoy themselves in spite of this destruction. Consider boat-dollars well spent as hedge against final entropy.
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