Ketch ketch and the yawl have two masts, with the main mast foremost; the distinction usually being that a ketch has the mizzen mast forward of the rudder post, whereas on a yawl, it is aft of the rudder post. But the balance of sail area can be an overriding characteristic. If 20% or more of the sail area is in the mizzen sail the rig would be termed a ketch. This is particularly true on center cockpit yachts. Compared to a ketch, a similar size yawl's mizzen sail is much smaller than the main, because of the limitations of the
Jack Ketch at the execution of Lord Russell, the Duke of Monmouth, and other political offenders." Because of his botched executions, the name "Jack Ketch" is used as a proverbial name for death, Satan, and executioner. Ketch took office in 1663, succeeding the late Edward Dun, to whom he had been apprenticed. He is first mentioned in the Proceedings of the Old Bailey for 14 January 1676, although no printed notice of the new hangman occurred until 2 December 1678, when a broadside appeared called "The Plotters Ballad, being Jack Ketch's incomparable Receipt for the Cure of Traytorous Recusants and Wholesome Physick