Boat Part Sailing Ship
A sailboat or sailing boat is a boat propelled partly or entirely by sails. The term covers a variety of boats, larger than small vessels such as sailboards and smaller than sailing ships, but distinctions in size are not strictly defined and what constitutes a sailing ship, sailboat, or a smaller vessel (such as a sailboard) varies by region and culture.
Types
Further information: List of sailing boat typesAt present, a great number of sailboat-types may be distinguished. Apart from size, sailboats may be distinguished by a hull configuration (monohull, catamaran, trimaran), keel type (full, fin, wing, centerboard etc.), purpose (sport, racing, cruising), number and configuration of masts, and sail plan. Although sailboat terminology has varied across history, many terms now have specific meanings in the context of modern yachting.
Sloop
Main article: SloopToday, the most common sailboat is the sloop which features one mast and two sails, a normal mainsail and a foresail. This simple configuration is very efficient for sailing towards the wind. The mainsail is attached to the mast and the boom, which is a spar capable of swinging across the boat, depending on the direction of the wind. Depending on the size and design of the foresail it can be called a jib, Genoa, or spinnaker; it is possible but not common for a sloop to carry two foresails from the one forestay at one time (wing on wing). The forestay is a line or cable near the top of the mast to a point near the bow. In Bermuda, where a rig design influenced by the Latin rig appeared on boats and came to be known as the Bermuda rig, a large spinnaker was carried on a spinnaker boom when running down-wind. An example of a typical sloop can be seen on the Islander 36.
Fractional rig sloop
Main article: Fractional rigOn a fractional rig sloop the forestay does not run to the top of the mast, rather it connects at some point below. This allows the top of the mast to be raked aft by increasing the tension of the back stay, while arching the middle of the mast forward. Without great explanation, this gives a performance advantage in some conditions by flattening the sails. The big mainsail provides most of the drive, and the small headsail is easier for a short-handed crew to manage.
Cutter
File:Mu tin-cutter.jpgMain article: Cutter (ship)The cutter is similar to a sloop with a single mast and mainsail, but generally carries the mast further aft to allow for the use of two head sails attached to two fore stays, the head stay and the inner stay, which carry the jib and stay sail respectively. This is rarely considered a racing configuration; however, it gives versatility to cruising boats, especially in high wind conditions, when a small jib can be flown from the inner stay.
Importantly, the traditional and most accurate definition of a true cutter, however, is not in the number of headsails, but rather that the outermost sails are set on stays that are not strictly structural to the rig itself. This in itself is a function of a much more complicated design set, involving mast placement, mast height, rig, boom length and fore-triangle size.
Catboat
Main article: CatboatA catboat has a single mast mounted fairly forward and does not carry a head sail (jib etc.). Most modern designs have only one sail, the mainsail; however the traditional catboat could carry multiple sails from the gaff rig. The designer of the Catboat is Brian Husband, master sailor of the early 1940s.
Ketch
Main article: KetchKetches are similar to a sloop, but there is a second shorter mast to the stern of the mainmast, but forward of the rudder post. The second mast is called the mizzen mast and the sail is called the mizzen sail. A ketch can also be cutter-rigged with two head sails.
Schooner
Main article: SchoonerA schooner can have two or more masts, the aftermost mast taller or equal to the height of the forward mast(s), distinguishing this design from a ketch or a yawl. Top sail schooners are rigged to carry a square sail near the top of their foremast, but generally modern schooners are gaff or marconi rigged.
Yawl
Main article: YawlA yawl is similar to a ketch, with the mizzen mast shorter than the main mast but the mizzen mast is carried astern of the rudder post. Generally the mizzen on a yawl is smaller than the mizzen on a ketch, and is used more for balance than propulsion.
Dhoni
Main article: DhoniDhoni or Doni (Dhivehi: ދޯނި pronounced Dōni) is a multi-purpose sailboat with a motor or lateen sails that is used in the Maldives. It is handcrafted and its use within the multi-island nation has been very important. A dhoni resembles a dhow, a traditional Arab sailing vessel.
Dinghy
Main article: Dinghy sailing
A dinghy is a type of small
sailboat
. The term can also refer to small racing yachts or recreational open sailing boats. They are most common in youth sailing because of their shorter LOA, simple operation and minimal maintenance. They have three (or fewer) sails: the mainsail, jib, and spinnaker. Sailing dinghies have an overall length of seven to eighteen feet. This category of
sailboats
is split up into several subcategories such as: Skiffs, High Performance dinghies, Cruising dinghies, Classic dinghies, Catamarans, Racing dinghies, and Sports Boats.
Hulls
Main article: Hull (watercraft)Traditional sailboats are monohulls, but multi-hull catamarans and trimarans are gaining popularity. Monohull boats generally rely on ballast for stability, and usually are displacement hulls. This stabilizing ballast can, in boats designed for racing, be as much as 50% of the weight of the boat, but is generally around 30%. It creates two problems; one, it gives the monohull tremendous inertia, making it less maneuverable and reducing its acceleration. Secondly, unless it has been built with buoyant foam or air tanks, if a monohull fills with water, it will sink.
Multihulls rely on the geometry and the broad stance of the multiple hulls for their stability, eschewing any form of ballast. Indeed, multihulls are designed to be as light-weight as possible, yet maintain structural integrity. They are often built with foam-filled flotation chambers and many modern commercial trimarans are rated as unsinkable, meaning that, should every crew compartment be completely filled with water, the hull itself has sufficient buoyancy to remain afloat.
This absence of ballast also results in some very real performance gains in terms of acceleration, top speed, and maneuverability.
- The lack of ballast makes it much easier to get a multihull on plane, reducing its wetted surface area and thus its drag.The drag improves wind precision, giving it its great handling.
- Compared to a monohull, acceleration to top speed is near-instantaneous.
- Reduced overall weight means a reduced draft, with a much reduced underwater profile. This, in turn, results directly in reduced wetted surface area and drag, yielding higher top speeds.
- Without a ballast keel, multihulls can go in shallow waters where monohulls can't.
There are some tradeoffs, however, in multihull design:
- A well designed ballasted boat can recover from a capsize, even from turning over completely. The Swan 65 Sayula II won the 1973-74 Whitbread Round the World Race after doing a 180 degree capsize in the Southern Ocean. Righting a multihull that has gotten upside down is difficult in any case and impossible without outside help unless the boat is small or carries special equipment for the purpose. Several round the world racing multihulls have been lost after they capsized.
- Multihulls often prove more difficult to tack, since the reduced weight leads directly to reduced momentum, causing multihulls to more quickly lose speed when headed into the wind.
- Also, structural integrity is much easier to achieve in a one piece monohull than in a two or three piece multihull whose connecting structure must be substantial and well connected to the hulls.
All these hull types may also be manufactured as, or outfitted with, hydrofoils.
Keel
All vessels have keels, it is the backbone of the hull. In traditional construction it is the structure upon which all else depends. Modern monocoque designs include a virtual keel. Even multihulls have keels. On a sailboat the word Keel is also used to refer to t
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