In modern usage, a sloop is a sailboat with a single mast [2] generally having only one headsail in front of the mast and one mainsail abaft (behind) the mast. It is a type of fore-and-aft rig. The mainsail may be of any type, most often Bermuda rig, but also others, such as gaff or gunter.
In naval terminology, "sloop-of-war" refers to the purpose of the craft, rather than to the specific size or sail-plan, and thus a sloop should not be confused with a sloop-of-war. As with many rig definitions, it was some time before the term sloop referred to the type of rig.
Regionally, the definition also takes into account the position of the mast. A forward mast placement and a fixed (as opposed to running ) bowsprit, but with two headsails may give categorisation as a sloop. An example is the Friendship Sloop. [1] : 48-53
The name originates from the Dutch sloep, which is related to the Old English slūpan, to glide. [3] The original Dutch term applied to an open rowing boat. [1] : 49 A sloop is usually regarded as a single-masted rig with a single headsail and a fore-and-aft mainsail. In this form, the sloop is the commonest of all sailing rigs –with the Bermuda sloop being the default rig for leisure craft, being used on types that range from simple cruising dinghies to large racing yachts with high-tech sail fabrics and large powerful winches. [1] : 48–53 If the vessel has two or more headsails, the term cutter is usually applied, though there are regional and historic variations on this. A boat with a forward mast placement and a fixed bowsprit, but more than one headsail, may be called a sloop. The Friendship sloop is an example of this. Particularly with historic craft, categorisation as a cutter may rely on having a running bowsprit. [1] : 49–55
Before the Bermuda rig became popular outside of Bermuda in the early 20th century, a (non-Bermudian) sloop might carry one or more square-rigged topsails, hung from a topsail yard and sheeted to a lower yard. [4]
A sloop's headsail may be masthead-rigged or fractional-rigged. On a masthead-rigged sloop, the forestay (on which the headsail is carried) attaches at the top of the mast. On a fractional-rigged sloop, the forestay attaches to the mast at a point below the top. A sloop may use a bowsprit, a spar that projects forward from the bow.