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Old 03-06-2008
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Plumper Plumper is offline
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What kind of rig is it? on what boat? The rig should not work fore and aft (pump) at all. Many big frac rigs have check stays or runners to prevent this, but not all do. It depends on how the lowers are rigged. The jumpers keep the top of the mast in column when tension is put on the backstay. The middle may come out of column if the shrouds are all athwartships of the mast (none run slightly aft). In that case there should be a baby stay or check stays to prevent pumping.
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