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Compound bows are typically constructed of man-made materials such as fiberglass and carbon fiber, while traditional bows and warbows usually are entirely or partially made of wood or bamboo. The pulley/cam system grants the user a mechanical advantage, and so the limbs of a compound bow are much stiffer than those of a recurve bow or longbow ...
The compound bow, not to be confused with a composite bow, is a modern bow that uses a levering system, usually of cables and pulleys, to bend the limbs. The limbs of a compound bow are much stiffer than those of a recurve bow or longbow. This limb stiffness makes the compound bow more energy-efficient than other bows, in conjunction with the ...
The details of manufacture varied between the various cultures that used them. Initially, the tips of the limbs were made to bend when the bow was drawn. Later, the tips were stiffened with bone or antler laths; post-classical bows usually have stiff tips, known as siyahs, which are made as an integral part of the wooden core of the bow.
The binary cam is a design for the pulley system of a compound bow. Craig Yehle, director of research and development at Bowtech Archery, received a patent [1] for the design on December 11, 2007. Bowtech started equipping its bows with the new cam design in the 2005 model year. [2] [3]
The bow is dated to the 3rd century BCE. The modern Japanese yumi is a laminated bow. Laminated bows in Japan first appeared around 1000 CE, during the late Heian or Kamakura period. They were made of wood and bamboo laminated with glue, evolving from simple bamboo-backed bows to complex bows of five piece construction (higo yumi) by the 1600s. [4]
The flatbow is a superior bow design for almost all materials because the stress is more evenly spread out than with rounded limb sections. A bow limb is essentially a flexed beam undergoing bending, and in any flexed beam the farther from the neutral axis (line in the middle of the flexing beam which is not under tension or compression: see diagram in Bending article) the more stress there is ...