Una rig

The single-sailed type of rig used by the American cat-boat Una which aroused much enthusiasm (and copying) when she appeared at Cowes in 1854. Although that particular rig raised the Gaff by a single halyard and a complex system of blocks, the term Una rig is generally applied to the Cat-boat pattern, where the mast is stepped well forward and no jib is carried. (But not to the various kinds of lug which are used without a jib.)