Editing Running rigging (section)

===Adjusting angle to the wind===
* [[guy (sailing)|Guy]]s, which control spar angle with respect to the apparent wind.
*[[Preventer]], is cordage attached to the end of the boom and fixed to (or running through a block) on the rail athwart or forward of the mast.  Its most common purpose is to prevent potentially dangerous movement of the spar in an accidental gybe.<ref name=HowardDoane/>
* [[Sheet (sailing)|Sheet]]s, which control foot tension of loose-footed sails, angle of attack with respect to the apparent wind and/or the amount of leech "twist" near the head of the sail. Central sheeting refers to main sheets that attach to the centre of the boom.  Sheets are made from thin low stretch cordage in racing yachts.<ref name=HowardDoane/>