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The use of a keel in sailing vessels dates back to antiquity. The wreck of an ancient Greek merchant ship known as the Kyrenia ship establishes the origin of the keel at least as far back as 315 BC. [4] [page needed] The Uluburun shipwreck (c. 1325 BC) had a rudimentary keel, but it may have been more of a center plank than a keel. [5]
The keel is the middle of the bottom of the hull, constructed by connecting three sections; stern keel, main keel and poop keel. The hull spreads in the arc towards both sides forming the keel. [63] The helm was the device that controls direction when sailing. It was a critical invention in shipbuilding technique in ancient China and was only ...
The ship's prospective name, without the "USS", is mentioned in the invitation, if known; otherwise, her type and number are given, e.g., DD 2217. [7] For submarines, they do not have a keel to be laid; instead, the initials of the ship sponsor are welded on a steel plate during the ceremony. The plate will be mounted in a place of honor on the ...
In many cases, these techniques were very labor-intensive or inefficient in their use of raw materials. Regardless of differences in ship construction techniques, the vessels of the ancient world, particularly those that plied the waters of the Mediterranean Sea and the islands of Southeast Asia were seaworthy craft, capable of allowing people ...
The galley was also used in the waters of Northern Europe, but to a lesser extent since its low freeboard and lack of stability in rough seas made it vulnerable. During the years 1150-1350, after the Second Crusade, the Mediterranean witnessed an economic boom known as the Commercial Revolution. To keep up with trade, ship building increased as ...
In the 2nd century AD, people from the Indonesian archipelago already made large ships measuring over 50 m long and standing 4–7 m out of the water. They could carry 600–1000 people and 250–1000 ton cargo. These ships were known as kunlun bo or k'unlun po (崑崙舶, lit. "ship of the Kunlun people") by the Chinese, and kolandiaphonta by ...
Concrete ships are built primarily with ferrocement (reinforced concrete) hulls, reinforced with steel bars. [1] This contrasts against more traditional materials, such as pure steel or wood. The advantage of ferrocement construction is that materials are cheap and readily available, while the disadvantages are that construction labor costs are ...
Formerly made of rope, typically of braided stainless steel wire, occasionally solid metal rod. Stem: a continuation of the keel upwards at the bow where the two sides of the hull meet. Stern: the aftmost part of a boat, often ending in a transom. Stern sheets a flat area or deck, inboard of the transom in a small boat. It may contain hatches ...