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post #20 of Old 09-24-2007
sailingdog
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Quote:
Originally Posted by Hartley18 View Post
...but where does the "pumping" come from??
As the headsail fills, it pulls the forestay attachment point on the mast forward... as the sail empties, say during a tack, the mast springs back, and then as the sail fills again, it gets pulled forward again... do this over and over again...say short-tacking up a channel in heavy wind, the repeated loading and unloading of the mast is generally referred to as "pumping", and can lead to the mast, shrouds and stays fatiguing... with the mast being the most affected, since it is aluminum, and aluminum fatigues the most readily. IIRC, stainless steel has to be loaded to a certain strain level before it starts to fatigue.

Sailingdog

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Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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