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Dynamic spine is largely determined by shaft length, head weight, and static spine. Static spine is the stiffness of the center portion of the shaft under static conditions. [ 19 ] The Archery Trade Association (ATA) (formerly the Archery Manufacturers and Merchants Organization (AMO)) static spine test method hangs a 2-pound (0.91 kg) weight ...
AMO length (measure) – A standardized length for measuring bow strings; arbalest – A late variation of the crossbow that came into use in Europe during the 12th century; archer (practitioner) – One who practices archery (a.k.a. bowman) archer's paradox (effect) – The effect produced by an arrow flexing as it leaves the bow
Arrow sizes vary greatly across cultures, ranging from eighteen inches to five feet (45 cm to 152 cm). [11] However, most modern arrows are 75 cm (30 in) to 96 cm (38 in) in length. Arrows recovered from the Mary Rose, an English warship that sank in 1545 whose remains were raised in 1982, were mostly 76 cm (30 in) long. [12]
Arrow stiffness (spine) is an important parameter in finding arrows that will shoot accurately from any particular bow (see Archer's paradox), the spine varying with both the construction and length of the arrow.
Shafts come with varying degrees of stiffness — referred to as the "spine" of the bolt. The more resistant to bending a bolt is, the more "spine" it is said to have, and a crossbow with higher draw weight ideally needs to be paired with a heavier bolt point and higher spine specifications.
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Japanese bows, arrows, and arrow-stand Yumi bow names Yumi ( 弓 ) is the Japanese term for a bow . As used in English , yumi refers more specifically to traditional Japanese asymmetrical bows, and includes the longer daikyū ( 大弓 ) and the shorter hankyū ( 半弓 ) used in the practice of kyūdō and kyūjutsu , or Japanese archery .
Draw lengths of the arrows varied between 24 and 32 inches (61 and 81 cm) with the majority having a draw length of 30 inches (76 cm). [22] The head would add 2.0 to 5.9 in (5 to 15 cm) depending on type, though some 0.79 to 1.77 in (2 to 4.5 cm) must be allowed for the insertion of the shaft into the socket.