Sail Survey Terms Flashcards
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Tensile Strength
Tensile strength is a measurement of the force required to pull something such as rope, wire, or a structural beam to the point where it breaks.
Modules of Elasticity
the ratio of the stress applied to a body or substance to the resulting strain within the elastic limit. Ratio of stress to strain
Lazzerette
A lazarette (also spelled lazaret) is a special area on a boat. It is often an area near or aft of the cockpit.
Chainplates
A chainplate is a metal plate used to fasten a shroud or stay to the hull of a sailboat.
Ballast
heavy material, such as gravel, sand, iron, or lead, placed low in a vessel to improve its stability.
Rot
decay caused by the action of bacteria and fungi; decompose.
Aft
at, near, or toward the stern of a ship
Tension
tension may be described as the pulling force transmitted axially by the means of a string, cable, chain
Compression
the result of the subjection of a material to compressive stress
Torsion
the action of twisting or the state of being twisted, especially of one end of an object relative to the other.
Flat Bottom
This boat hull is very stable in calm weather. This planing hull has a shallow draft, which is good for fishing in small lakes and rivers.
Round Bottom
This hull is rounded to allow the boat to travel through water easily at slower speeds to limit the amount of drag on the boat.
V Bottom
This fishing boat is easier to maneuver at slow speeds, the Deep-Vee design offers a good ride in rough water as the pointed bow slices forward and the “V” shaped. This planing hull has a shallow draft, which is good for fishing in small lakes and rivers.
LOL Lenght Overall
It’s a measurement that is supposed to be done from the foremost part of the boat to the aftermost, taking in anything that is a permanent part of the structure.
Beam
its width at the widest point as measured at the ship’s nominal waterline.
LWL Lenght of Water Line
The waterline length (originally Load Waterline Length, abbreviated to LWL) is the length of a ship or boat at the point where it sits in the water.
Draft
The distance from the surface of the water to the ship’s keel (how deep the ship is into the water).
Athwartships
Across the ship, at right angles to the centreline.
Stem
The upright post or bar of the bow.
Stern
The after part of the vessel.
Pulpit
The railing at the bow of a boat, which sometimes extends past the deck. It is sometimes referred to as bow pulpit.
Pushpit
The railing at the sternof a boat, Taffrail
Coaming
A part of the frame of a deck hatch or cabin trunk which is raised above deck level to keep out water. 2) A raised partition around the cockpit of small sailboats which keeps water from entering the cockpit well.
Keel
The central longitudinal structural member of a ship to which all the frames, stem and sternpost are fastened.
Chine
The edge formed on the hull of a flat bottomed or V-bottomed boat where the bottom joins the topsides.
Topsides
The visible outside of the hull. The outside face of the hull between the water and the deck.
Forefoot
The area of a ship’s hull where the keel and stem are joined.
Cabinhouse
The captain’s quarters. The enclosed space of decked-over small boat.
Sheer
The curved fore and aft line formed by the uppermost plank of a boat.
Shear
A hoisting rig for unshipping a mast employing two spars joined at the top from which the tackle is suspended. From the term shears, meaning like scissors.
Flare
A bow with an extreme flare at the upper and forcastle deck.
Waterline
The plane where a normally laden boat hull lies at the water’s surface.
Depth
1) The vertical distance from the surface to the bottom of a body of water. 2) One of the admeasurement of a ship, indicating the interior distance from the upper deck to the deepest part of the bilge.
Breadth
The transverse measurement of a boat at its widest point. Also called breadth. (2) One of the transverse members of a ship’s frames on which the decks are laid.
Free Board
The vertical distance between the water and the gunwale of a boat; as in: “She doesn’t have enough freeboard for a sea boat.â€
Deadrise
The height of the waterline above and away from the level of the keel expressed in inches per footDescribing the underwater shape of a V bottom or round bottom boat.
Displacement
The weight of a mass of water pushed aside by the intrusion of a ship’s hull.
Wetted Surface
The underwater area of a vessel, used by designers to calculate hydraulic effects on capability and speed.
Longitudinal Stiffeners
Supports installed to provied rigity to reduce the possibility of oil caning
Intercostals
Short pieces between the frames,Plates which fit between floors to stiffen the double bottom of a ship. Intercostal comes from the Latin words inter, meaning between, and costa, meaning rib.
Engine Girders
engines up to 400kW are to be mounted on longitudinal bottom girders. The frames just “up front and beyond” the engine have to be web frames, stronger than regular transverse frames
Bulkheads
(1) A vertical structural partition dividing a vessel’s interior into various compartments for strength and safety purposes; (termed strength bulkhead). (2) Term applied to vertical partition walls (non-structural) subdividing the interior of a vessel into compartments.
Spars
The general term for any of the abovedeck timbers to which sails are bent, such as the masts, booms, gaffs yards and sprits.
Turn of the Bilge
The part of the bottom of a ship where the relatively flat shape begins curving up to form the topsides.
Bilge
The deepest part inboard of a ship’s hull, where any leakage collects.
Transom
The flat outboard stern structure of a ship from keel to deck.
Quarter
The stern part of a vessel on either side of the rudder.
Counter
1) The overhanging stern portion of the hull of a vessel. The outboard stern portion of the hull between the waterline and the rail, especially as it applies to the lines of the vessel
Dead Rise
The upward slope of a ship’s bottom from the keel to the bilge. This rise is to give drainage of oil or water toward the center of the ship.
Center Board
A heavy retractable fin extending through the bottom of a small sailboat to provide stability, reduce leeway and improve the efficiency of the sail. A movable keel.
Dagger Board
A centerboard in very small sailboats which is emplaced or removed vertically through a well or trunk.
Helm Station
a positon where the bost is helmed , steerage is controled
Tiller
A long hand lever attached to the top of the rudder, used to steer the vessel. The term is derived from the handle of a plow used to till the soil.
Topside
Deck part of the boat
Superstructure
In ships this is the name given to the part of the ship that emerges from the deck.
Sea Cock
A safety valve mounted inboard of a through hull fitting. If a pipe from a through hull fitting begins leaking, the sea cock can be closed to prevent flooding while repairs are made.
Abaft
Toward the stern, as in: In a yawl rig, the mizzen is stepped abaft the rudder post.
Flair
The spreading out from the central vertical plane of the body of a ship with increasing rapidity as the section rises from the waterline to the rail.
Forestay
The cable or line in the standing rigging which runs from the head of the foremost mast to the foredeck at the bow.
Backstay
A wire or rope support extending from the masthead aft and fastening to chain plates abaft the step or at the stern
