Glossary - Boat Types & Basic Info

Category:Boat types

aft, abaft - Toward the stern of the boat.

barrelback runabout - A runabout with an exceptionally crowned deck,

bass boat - An inboard-powered boat of about 25 feet, developed especially for bass fishing, that is fast and maneuverable. Bass boats are usually fitted with a small trunk cabin and windshield forward, and a large cockpit aft.

beam sea - Waves that come at a boat from the side. A beam sea causes the boat to roll more than directly oncoming or following waves.

bilge - The space under the floorboards or cabin sole where water may collect; also, the curved, transitional area of a roundbottomed hull where the sides and bottom come together.

bitts - Posts near the bow or stern used for tying the boat to a dock or mooring.

boom - A near-horizontal spar projecting aft from a mast, and controlled by a rope called a sheet, to which a sail attaches; also, a spar attached to a mast near the deck and used for hoisting or lowering a load such as a small boat.

bow - The forward end of a boat's hull, bow chocks Fairleads adjacent to the stem at deck level through which rope can pass without chafing excessively.

cavitation - An undesirable propeller performance caused by air that is drawn in or created at the propeller blades. A cavitating propeller, because it is biting into air instead of water, looses its thrust and races inefficiently.

chine - The sharp corner in a flat or V- bottomcd boat where the hull sides and bottom meet.

clipper bow - A bow that is concave in profile and usually terminates with a decorative carving called a billethead. These bows are often further adorned with trailboards that extend aft along the sheer from the billethead.

coaming - The rim around a cockpit or deck opening that projects above deck level.

cockpit - The sunken space from which the helmsman steers the boat and where the passengers congregate.

davits - Stationary or swinging arms used for hoisting a small boat out of the water. Single davits are also used to lift other items such as anchors.

deadrise boat - An inboard workboat from the Chesapeake Bay region with a bottom that is V-shaped and cross-planked.

deckhouse - An enclosure, with windows, built relatively high above the deck that

provides accommodation and shelter. displacement boat - A non-planing craft whose speed is limited by its waterline length and the waves it makes.

dory - A simple, flat-bottomed boat with flaring sides that is planked longitudinally over wide-spaced, sawn frames.

double-ender - A boat without a transom that is pointed at both bow and stern, electric launch An open boat of slow to moderate speed powered by an electric motor driven by storage batteries.

forward - Toward the bow. gill-netter A commercial fishing boat equipped with a long net of monofilament stored on a big, hydraulically powered reel at the stern.

hackmatack - A species of softwood, also known as larch and tamarack, from which wooden knees are made. One tree usually produces only a single knee whose long arm comes from the trunk, and the short arm from the largest root.

hydroplane - A very fast boat whose bottom is stepped to reduce its resistance when planing.

knee - A grown timber or lamination with two relatively short arms that run roughly at right angles to each other. Knees are used for connecting and/or bracing two structural members such as a frame and a deck beam.

lakes - launch An open powerboat for use on freshwater lakes.

lapstrakc - A type of hull planking in which the planks overlap each other like the clapboards of a house.

launch - Generally, a small, engine-driven displacement boat that has little or no cabin. (See chapter introduction, page 9.) lee shore A coastline that is downwind from a boat.

motorsailer - A boat fitted with both sail and engine that can utilize either or both for motive power.

motoryacht - An engine-driven boat large enough to require and accommodate a professional captain and crew.

outboard - A boat propelled by an outboard motor; also, the motor itself; also, a direction or location toward one side of the boat from the middle.

outrigger - A boom or pole that runs athwartships instead of fore-and-aft.

paravane - A device that is towed underwater from the ends of outriggers (one on each side) to dampen a boat's roll. A paravane consists of a flat plate with a vertical vane along its centerline to which a cable can be shackled. Under tow, the paravane angles slightly downward and keeps a significant strain on the towline.

plane - To travel fast upon the surface of the water. In order to "climb up" on top of the bow wave it creates and begin planing, a boat must have a lot of power for its weight and a hull bottom that is relatively straight in its aft portion when viewed from the side.

plumb stem - A stem that is vertical or nearly so in profile.

plane - To travel fast upon the surface of the water. In order to "climb up" on top of the bow wave it creates and begin planing, a boat must have a lot of power for its weight and a hull bottom that is relatively straight in its aft portion when viewed from the side.

plumb stem - A stem that is vertical or nearly so in profile.

power cruiser - An engine-driven boat with cruising accommodations that is usually owner-operated and no more than 60 feet in length

racebo - A fast, engine-driven boat created primarily to compete for speed against similar boats on a racecourse.

runabout - A fast, open powerboat that planes.

semi-displacement boat - A craft with moderate power whose maximum speed lies in the transition between non-planing and fully planing.

sheer - The line formed by the hull sides meeting the deck; in an undecked craft.

single screw - An inboard powerboat with a single engine and propeller.

skeg - The underwater vertical portion of the hull near the stern to which the rudder is often attached.

skiff - A flat-bottomed rowboat.

spar - A tapered pole, such as a mast, boom, or outrigger.

sponsons - Watertight pods on each side of a boat's hull that increase stability.

stem - The center, upright, forward-most picce of wood on a boat, to which the forward ends of the planks arc fastened.

stern - The aft, or back, end of a boat's hull.

strip planking - Hull planking made of narrow, parallel strips that arc edge- fastened and usually glued together.

transom - The transverse portion of a boat's hull at its aft end.

trunk cabin - A low cabin that projects from the deck to increase headroom within the hull.

twin screw - An inboard powerboat with side-by-side engines, shafts, and propellers.

V-bottom - A type of undcrbody characterized by a bottom that is V-shaped when viewed from bow or stern and which has a knuckle called a chine where the bottom meets the sides.

working boat - A boat engaged in commercial activity such as fishing or carrying passengers for hire.