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A structural keel is the bottom-most structural member around which the hull of a ship is built. The keel runs along the centerline of the ship, from the bow to the stern . The keel is often the first part of a ship's hull to be constructed, and laying the keel , or placing the keel in the cradle where the ship will be built, may mark the start ...
Frames support the hull and give the ship its shape and strength. In wooden shipbuilding, each frame is composed of several sections, so that the grain of the wood can follow the curve of the frame. 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 ...
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 wale remains in situ, as a structural stringer. A wale is one of the strakes of wooden planking that forms the outer skin of the hull of a ship, but substantially thicker than the other strakes. It provides extra stiffening and strength to the hull.
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.
A ship's hull is composed of individual parts called members. [83] The set of dimensions of these members is called the ship's scantlings. [83] Naval architects calculate the stresses a ship can be expected to be subjected to, add in safety factors, and then can calculate the required scantlings. [83]
On ships with more than one level, 'deck' refers to the level itself. The actual floor surface is called the sole; the term 'deck' refers to a structural member tying the ship's frames or ribs together over the keel. In modern ships, the interior decks are usually numbered from the primary deck, which is #1, downward and upward.
This causes the middle of the ship to bend down slightly, and depending on the level of bend, may cause the hull to snap or crack. Sagging or dynamic hogging may have been what sank the Prestige off Spain on 19 November 2002. The 2013 loss of container ship MOL Comfort off the coast of Yemen was attributed to hogging. Subsequent lawsuits blamed ...