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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.
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 .
Modern (takedown) recurve bow. Compound bows are designed to reduce the force required to hold the string at full draw, hence allowing the archer more time to aim with less muscular stress. Most compound designs use cams or elliptical wheels on the ends of the limbs to achieve this. A typical let-off is anywhere from 65% to 80%.
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 ...
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Allen was born July 12, 1909, in Stilwell, Kansas.In the 1960s, he sawed the ends off a conventional recurve bow and then added pulleys to each end. [1] Allen experimented with a number of designs to apply for a patent on June 23, 1966, [2] and U.S. patent 3,486,495 was granted to him in December 1969.
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 ...
The riser is the center where the archer holds the bow. The limbs attach to the riser. The limbs are the parts of a bow that bend when the string is drawn. The string attaches at each end of the limbs and gives propelling force to the arrow. An archer can update their takedown bow with new limbs to take advantage of advancements in materials or ...