Bow and arrow
A bow and arrow is a ranged weapon system comprising a bow—an elastic arc-shaped device typically constructed from materials such as wood, horn, or composites like sinew and layered woods—and an arrow, a slender projectile with a pointed tip, fletching for stabilization, and a nock to engage the bowstring. The bow functions by storing potential energy when drawn and strung, which is rapidly released to launch the arrow at high velocity, enabling effective hunting and combat at distances beyond throwing range. The origins of the bow and arrow trace back to the Middle Stone Age, with the earliest direct evidence of its use emerging approximately 64,000 years ago at Sibudu Cave in KwaZulu-Natal, South Africa, where microscopic use-wear analysis on quartz segments indicates they served as stone-tipped arrowheads hafted for bow propulsion.[1] This technology likely originated in Africa among early modern humans and spread globally, with subsequent evidence appearing around 54,000 years ago in Eurasia at Grotte Mandrin in France, based on impact fractures and cross-sectional dimensions of microlithic points consistent with arrow impacts.[2] By the Upper Paleolithic period, the bow and arrow had become widespread across continents, revolutionizing hunting strategies by allowing for more efficient pursuit of game from safer distances and contributing to social complexity in human societies.[3] Throughout history, the bow and arrow served multifaceted roles in hunting, warfare, and ceremonial practices, with construction evolving from simple wooden self-bows to advanced composite designs incorporating animal horn for compression strength and sinew for tension backing, as seen in ancient Eurasian traditions[4] and similar designs among some Native American groups.[5] In warfare, it enabled massed volleys and tactical advantages, exemplified by the longbows of medieval Europe made from yew wood and the short recurve bows of steppe nomads. Today, while largely supplanted by firearms, the bow and arrow persists in modern archery sports, recreational hunting, and cultural revivals, underscoring its enduring legacy as a pinnacle of prehistoric engineering.[6]Fundamentals
Basic design
A bow functions as a flexible, two-limbed spring-like device that stores elastic potential energy when its string is drawn back, converting this energy into kinetic energy to propel an arrow upon release.[7] The core structure includes curved or straight limbs attached to a central handle or riser, with a taut bowstring connecting the limb tips to form a stable frame.[8] This design allows the limbs to deform elastically under tension, following Hooke's law where force is proportional to displacement, enabling efficient energy storage without permanent deformation.[7] In its ready position, the strung bow stands with limbs extended and the string in a relaxed but secure alignment, ready for drawing.[7] When drawn, the archer pulls the string rearward to a full draw length—typically 26 to 30 inches for adults—bending the limbs inward and creating a temporary high-energy state that contrasts sharply with the bow's equilibrium shape.[7] Upon release, the limbs snap back, accelerating the arrow forward while the string imparts initial thrust.[9] The arrow serves as the projectile in this system, featuring a central shaft that provides the primary flight path and structural integrity, often made from materials like carbon or aluminum for straight-line stability.[10] At the rear, fletching—consisting of feathers or plastic vanes—generates aerodynamic drag and spin to stabilize the arrow in flight and correct deviations.[10] The forward point, or arrowhead, concentrates impact force for penetration or target adhesion, varying in shape based on purpose but integral to the arrow's terminal ballistics.[10] For optimal efficiency in energy transfer and handling, the bow's overall length is designed to relate to the archer's draw length, typically ranging from 2 to 2.5 times longer to minimize string angle issues and maximize limb leverage without compromising stability.[11] This ratio ensures the drawn string forms an appropriate geometry, allowing full draw without excessive finger pinch or inefficient power stroke.[11]Mechanism of operation
When an archer draws the bowstring, the limbs of the bow flex under tension, storing elastic potential energy in the deformed structure.[9] This stored energy represents the work done by the archer's muscles over the draw length, typically building gradually to allow controlled input.[12] Upon release, the bowstring propels forward, converting the potential energy into kinetic energy that accelerates the arrow.[7] The nock, a small notch at the rear of the arrow, grips the bowstring securely during this phase, facilitating direct and efficient transfer of the bow's energy to the arrow without slippage.[13] As the string moves toward its rest position, it imparts forward momentum to the arrow, which begins accelerating rapidly due to the high-speed motion of the string.[14] The arrow detaches from the string when the bow reaches brace height, at which point the nock releases, allowing the arrow to continue in flight while the string undergoes residual vibrations.[15] These vibrations occur after the arrow has left because the string's elastic rebound generates oscillations that are not fully damped by the time of separation, with the arrow's lighter mass enabling it to outpace the string's full cycle.[16] For safety, the arrow must be properly nocked and aligned with the bow's rest or shelf to ensure energy is directed to the projectile; releasing the string without an arrow—known as dry-firing—causes the stored energy to rebound into the bow's limbs and components, potentially leading to fractures, string failure, or injury to the archer.[17]Terminology
The terminology used in archery provides a precise vocabulary for describing the construction, operation, and performance of bows and arrows. These terms originated from historical practices and have been standardized by governing bodies to facilitate consistent understanding across disciplines, from traditional to Olympic archery. Central to bow evaluation are measurements like draw weight, which quantifies the force required to pull the string, and draw length, which determines the archer's personal fit.[18] Similarly, brace height measures the strung bow's geometry, influencing stability and arrow speed.[19] Arrow-specific terms focus on elements that ensure flight accuracy and safety. The spine refers to the shaft's stiffness, critical for matching arrow flex to bow power, while fletching consists of vanes or feathers that stabilize trajectory. The nock, a notched end fitting the string, secures the arrow during draw. For bows, the riser forms the rigid handle, limbs are the flexible arms storing energy, and tiller adjusts limb balance for even draw force.[20] These definitions apply uniformly, though slight variations exist in traditional contexts.[21]Essential Archery Terms
- Draw weight: The maximum force, typically measured in pounds, required to pull the bowstring back to full draw length, indicating the bow's power potential.[18]
- Draw length: The distance, usually in inches, from the bowstring at full draw to the bow's grip pivot point (plus a standard 1.75 inches for measurement), tailored to the archer's arm span and shooting style.[19]
- Brace height: The perpendicular distance between the bowstring and the deepest part of the handle grip when the bow is strung but undrawn, affecting forgiveness and arrow velocity.[18]
- Spine: A measure of an arrow shaft's stiffness, determined by its deflection under a standard load (e.g., 880 grams over 28 inches), essential for preventing erratic flight.[18]
- Fletching: The feathers, plastic vanes, or similar stabilizers attached near the rear of the arrow shaft to induce rotation and correct flight path deviations; derived from the Old English "fledge," meaning to feather a bird.[20]
- Nock: The grooved fitting at the arrow's rear that clips onto the bowstring, or the grooves at the bow limbs where the string attaches; originates from Middle Dutch "nocke," denoting a tip or notch.[20]
- Riser: The central, non-flexing section of a modern bow that serves as the handle and mounting point for limbs and accessories, providing structural stability.[18]
- Limbs: The upper and lower flexible sections of the bow extending from the riser to the string tips, which store and release energy during the shot.[20]
- Tiller: The adjustment or measurement of the distance between each limb's fadeout (near the riser) and the bowstring, ensuring balanced draw force (typically 1/4 to 1/2 inch more on the top limb).[18]
- Recurve: A bow design where the limb tips curve away from the archer when unstrung, enhancing energy storage; the term combines "re-" (back) with "curve," reflecting the reversed bend.[18]
- Longbow: A tall, straight-limbed bow, often over 5 feet in length, with D-shaped cross-section for power; named descriptively for its elongated form compared to shorter bows.[18]
- Bowstring: The cord connecting the bow's limb tips, under tension to propel the arrow; historically made from sinew or plant fibers.[21]
- Nocking point: The marked position on the bowstring where the arrow's nock rests perpendicular to the ground, aiding consistent alignment.[20]
- Shaft: The main elongated body of the arrow, typically made of wood, aluminum, or carbon, connecting the point to the nock.[20]
- Pile: The interchangeable metal tip or point at the arrow's front, designed for target penetration or broadhead use in hunting.[20]