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I'm wondering, in general, is the purpose of a baby stay to help hold the mast up, or to allow the sailors to add more bend to the mast?
 

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You can use it to put more bend in the mast, which will flatten and de-power the main. It can also keep the rig from pumping fore and back in the middle in wavy conditions.
 

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I have always considered it a stabiliser to stop pumping of the mast in heavy seas (SteveInMD already mentioned) but I believe it should be used with running backstays to work correctly.

It is also a good place to hang a hank-on storm jib if your primary headsail is on a furler.
 

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On many boats it is really there to prevent the mast from pumping, which can lead to fatigue and loss of the rig.
 

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Some boats have a hydraulic ram at the base of the baby stay so it's adjustable. If it does it's meant to be used for tuning - mast bend, draft position, etc. If it's not adjustable then it's just there to prevent pumping.
 

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In a conventional sloop rig there is an upper shroud that goes from the deck to the masthead. There are two lowers on each side, one forward of the mast position and one aft of the mast position. Some boats have a rig with a single lower and a babystay instead of forward lowers. This babystay replaces the forward lowers and is essential to the stability of the rig. On these rigs the existing lower is either aft of the mast or even with the mast. This allows more bending of the mast for efficiency on various points of sail. Either way it is essential and shouldn't be removed.
Brian
 
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