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Keel: the main structural member of a traditional vessel, running fore and aft from bow to stern on its centerline. It provides ballast for stability, and resistance to leeway moving through the water. Keelson: an internal beam fixed to the top of the keel to strengthen the joint of the upper members of the boat to the keel.
The keel is the bottom-most longitudinal structural element of a watercraft. On some sailboats, it may have a hydrodynamic and counterbalancing purpose as well. The laying of the keel is often the initial step in constructing a ship. In the British and American shipbuilding traditions, this event marks the beginning date of a ship's construction.
Hogging is the stress a ship's hull or keel experiences that causes the center or the keel to bend upward. Sagging is the stress a ship's hull or keel is placed under when a wave is the same length as the ship and the ship is in the trough of two waves.
Reconstruction of a 19th-century naval architect's office, Aberdeen Maritime Museum General Course of Study leading to Naval Architecture degree Naval architecture, or naval engineering, is an engineering discipline incorporating elements of mechanical, electrical, electronic, software and safety engineering as applied to the engineering design process, shipbuilding, maintenance, and operation ...
Draft (d) or (T) is the vertical distance from the bottom of the keel to the waterline. Freeboard (FB) is depth plus the height of the keel structure minus draft. Length at the waterline (LWL) is the length from the forwardmost point of the waterline measured in profile to the stern-most point of the waterline.
The skeleton of a boat consists of a number of ribs that sprout from the keel Rib marked with 14. On a vessel's hull, a rib is a lateral structural member which runs between gunwales and sprouts from the keel. [1] They are called "ribs" because they resemble the human rib. The ship's outer planking and inner sheathing are attached to the ribs.
Starting from the keel, these are the floor (which crosses the keel and joins the frame to the keel), the first futtock, the second futtock, the top timber, and the rail stanchion. [1] In steel shipbuilding, the entire frame can be formed in one piece by rivetting or welding sections; in this case the floor remains a separate piece, joining the ...
Frame-first construction involves laying down the framework of the vessel before attaching the planks to the boat. This is normally done by erecting a "master frame" in the center of the keel, and deriving the shapes of the other frames using a curved piece of wood stretched between the frame and the end posts, or through a geometric curve.