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The word "keel" comes from Old English cēol, Old Norse kjóll, = "ship" or "keel".It has the distinction of being regarded by some scholars as the first word in the English language recorded in writing, having been recorded by Gildas in his 6th century Latin work De Excidio et Conquestu Britanniae, under the spelling cyulae (he was referring to the three ships that the Saxons first arrived in).
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.
Coracles are round or oval in shape, made of a wooden frame with a hide stretched over it then tarred to provide waterproofing. Being so light, an operator can carry the light craft over the shoulder. They are capable of operating in mere inches of water due to the keel-less hull.
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 ...
A recent feature is a winged keel, which is short and shallow, but carries a lot of weight in two "wings" which run sideways from the main part of the keel. Even more recent is the concept of canting keels , designed to move the weight at the bottom of a sailboat to the upwind side, allowing the boat to carry more sails.
Worst features: Fin keel with bulb makes the boat a chore to launch at shallow ramps. Also, the boats are among the oldest fiberglass boats around, and most will require more strenuous than ordinary maintenance to keep in top condition. The keel (made of iron, which rusts), keel bolts, and surrounding fiberglass are common causes of concern." [6]
With a keel length of about 25.5 meters and an overall length in excess of 30 meters, it was a large ship for the time, especially in the Baltic Sea. It served not only as a warship armed with as many as 68 artillery pieces, but as a mobile castle to serve all of the king's needs as he traveled throughout his realm.
Moulded depth (D) is the vertical distance measured from the top of the keel to the underside of the upper deck at side. [4] Form derivatives that are calculated from the shape and the block measures. They are: Displacement (Δ) is the weight of water equivalent to the immersed volume of the hull.