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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.
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 from the center of a 26-inch (0.66 m) suspended section of the arrow shaft.
In modern archery, a compound bow is a bow that uses a levering system, usually of cables and pulleys, to bend the limbs. [1] The compound bow was first developed in 1966 by Holless Wilbur Allen in North Kansas City, Missouri, and a US patent was granted in 1969. Compound bows are widely used in target practice and hunting.
The arrows were made of pine and consisted of a main shaft and a 15–20 cm (5.9–7.9 in) fore shaft with a flint point. There are no definite earlier bows; previous pointed shafts are known, but may have been launched by spear-throwers rather than bows. The oldest bows known so far comes from the Holmegård swamp in Denmark.
Target archery is the most popular form of archery, in which members shoot at stationary circular targets at varying distances. All types of bow – longbow , barebow, recurve and compound – can be used.
The archery business was named Bear Archery. In 1947 the company moved to a new facility in Grayling, Michigan. The Grayling plant focused on making and marketing recurve bows and longbows in a growing archery market. Bow manufacturing changed from hand-made bows to mass production using fiberglass and other modern materials.
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The maximum permitted draw weight is 43 kg (95 lb) at a maximum power stroke of 30 cm (12 in). Shooting a 20 grams (310 grains) bolt this set up will generate an initial velocity of around 67 m/s (240 km/h; 150 mph). Field crossbow bolts are made from tubular aluminium or carbon-fibre archery shaft materials.
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