Product Code Database
A longbow is a type of tall bow that makes a fairly long Bow draw possible. Longbows for hunting and warfare have been made from many different woods in many cultures; in Europe they date from the Paleolithic era and, since the Bronze Age, were made mainly from Taxus baccata, or from Ulmus glabra if yew was unavailable. The historical longbow was a self bow made of a single piece of wood, but modern longbows may also be made from modern materials or by gluing different timbers together.
/ref> Another bow made from yew, found within some peat in Somerset, England has been dated to 2700–2600 BC. Forty longbows, which date from the 4th century AD, have been discovered in a peat bog at Nydam in Denmark.Loades, Mike (2013) The Longbow, Osprey Publishing, (p. 7)
The Battle of Tippermuir (1644), in Scotland, may have been the last battle in the British Isles to involve the longbow in significant numbers. It has also been claimed that longbows may have been used as late as 1654 at the Battle of Tullich in northeast Scotland.
Organisations that run archery competitions have set out formal definitions for various classes of bow; many definitions of the longbow would exclude some medieval examples, materials, and techniques of use. Some archery clubs in the United States classify longbows simply as bows with strings that do not come in contact with their limbs. According to the British Longbow Society, the English longbow is made so that its thickness is at least (62.5%) of its width, as in Victorian era longbows, and is widest at the grip. A similar, more inclusive, definition was created by the International Longbow Archers Association (ILAA) which defined the bow as fitting within a rectangular template of the proportions 1:0.625.
One of the simpler longbow designs is known as the self bow, by definition made from a single piece of wood. Traditional English longbows are self bows made from Taxus baccata wood. The bowstave is cut from the radius of the tree so that sapwood (on the outside of the tree) becomes the back and forms about one third of the total thickness; the remaining two-thirds or so is heartwood (50/50 is about the maximum sapwood/heartwood ratio generally used). Yew sapwood is good only in tension, while the heartwood is good in compression. However, compromises must be made when making a yew longbow, as it is difficult to find perfect unblemished yew. The demand for yew bowstaves was such that by the late 16th century mature yew trees were almost extinct in northern Europe. Yew: A History. Hageneder F. Sutton Publishing, 2007. . In other desirable woods such as Osage orange and mulberry the sapwood is almost useless and is normally removed entirely.
Longbows, because of their narrow limbs and rounded cross-section (which does not spread out stress within the wood as evenly as a flatbow’s rectangular cross section), need to be less powerful, longer or of more elastic wood than an equivalent flatbow. In Europe the last approach was used, with yew being the wood of choice, because of its high compressive strength, light weight, and elasticity. Yew is the best widespread European timber that will make good self longbows, (other woods such as elm can make longbows but require heat-treating of the belly and a wider belly/narrower back, while still falling into the definition of a longbow) and has been the main wood used in European bows since Neolithic times. More common and cheaper hard woods, including elm, oak, hickory, Ash tree, hazel and maple, are good for flatbows. A narrow longbow with high draw-weight can be made from these woods, but it is likely to take a permanent bend (known as "set" or "following the string") and would probably be outshot by an equivalent made of yew.
Wooden laminated bow longbows can be made by gluing together two or more different pieces of wood. Usually this is done to take advantage of the inherent properties of different woods: some woods can better withstand compression while others are better at withstanding tension. Examples include hickory and lemonwood, or bamboo and yew longbows: hickory or bamboo is used on the back of the bow (the part facing away from the archer when shooting) and so is in tension, while the belly (the part facing the archer when shooting) is made of lemonwood or yew and undergoes compression (see bending for a further explanation of stresses in a bending beam). Traditionally made Japanese yumi are also laminated longbows, made from strips of wood: the core of the bow is bamboo, the back and belly are bamboo or hardwood, and hardwood strips are laminated to the bow's sides to prevent twisting. Any wooden bow must have gentle treatment and be protected from excessive damp or dryness. Wooden bows may shoot as well as fiberglass, but they are more easily dented or broken by abuse. Bows made of modern materials can be left strung for longer than wood bows, which may take a large amount of set if not unstrung immediately after use.
|
|
