What's the difference between compound bow and recurve bow?

The bow used in modern sports recurve bow archery is composed of handle, bow piece, bowstring, arrow platform, arrow side pad, sight and counterweight shock absorber. The compound bow consists of a handle, a bow arm, an eccentric wheel, an axle, a bowstring, a rear window, a tension adjusting bolt, a stay cable, a stay cable limiting rod, a slider, an arrow rack, a sight, a counterweight damping rod and a spreader. Recurve bow and compound bow are both sports equipment that shoot arrows at the target by artificially opening the bow effectively and coherently with the aid of the elasticity of the bow piece. For a bow with the same tension standard, the longer recurve bow's bow is stretched, the greater the tension, and the farther the arrow will shoot. Compound bow is to install eccentric wheels and crown blocks with different shapes at the top fixed positions of upper and lower bow pieces (most aiming compound bows generally adopt eccentric wheels symmetrical up and down), fix cables and bowstrings with positioning lengths on pulley positioning pins, install bowstrings with appropriate lengths through pulley grooves, and use the lever principle of eccentric wheels to pull the bow with greater tension. The drawn bow will eventually reduce the tension by 65-75% according to the eccentric wheels with different shapes. In other words, the opening force of compound bow is greater, and the symmetrical force of opening bow is greatly reduced. It is worth mentioning that the longest pulling distance of the bow block of the compound bow is not changed due to the mutual restriction between the pulley positioning pin and the cable and the bowstring. So the same bow, after its bow file is determined, the tension is the same, and theoretically the archery distance is the same.

2. In view of the differences:

Recurve bow's aim is to make use of the tangency between the bowstring and the bow handle (or the outer ring of the scope), and to ensure the distance between the arrow mouth and the eyes through the same relationship between the bowstring hand and the lower jaw. It can also be said that recurve bow's aiming method is formed by the overlapping of two triangles at a certain target distance, namely, the vertical (the fixed distance between the arrow mouth and the eye is contracted to the target intersection through the straight extension of the arrow tip and the sight) and the horizontal (the straight line with the fixed distance between the bowstring and the sight extends to the target intersection). Most compound bows for the purpose of competition use optical sights. On the basis of recurve bow sight, a magnifying glass is used to replace the sight, and a horizontal bubble can be installed at the lower part of the magnifying glass to ensure the verticality of the bow. Install the rear window at the eye position above the bowstring arrow mouth. In this way, the relationship between the sight (the aiming point in the middle of the magnifying glass), the gap (the back window on the bowstring) and the target is formed. Looking at the magnifying glass on the sight through the back window forms the optical principle of the telescope and magnifies the target clearly, which is equivalent to optical aiming. The aiming method of compound bow is simply to center the center line. In other words, the outer ring of the magnifying glass should be centered through the rear window, and the aiming point in the magnifying glass should be aimed at the target center point.

3. Arrow platform difference

The archery platform in recurve bow generally adopts the parallel type. Because the string is hooked and set by hand, the tail of the arrow that leaves the string will swing from side to side within a certain distance and remain vertical and straight until it is parabolic. Most of the compound bows aimed at the game use a straight arrow table. Due to the adoption of mechanical spreading, the influence of fingers on the bowstring can be avoided and the vertical flight of the arrow can be ensured.

4, put the difference

Recurve bow's release is achieved by the uniform release of the bowstring player's three-finger flexors, so that the bowstring can roll out of the fingertips at the fulcrum. The compound bow is specially made of different types of mechanical spreaders. You can shoot an arrow by pulling the trigger on the spreader with your thumb or forefinger. To put it simply, recurve bow's unfolding is realized by the action of three fingers on the bowstring. The force change of different fingers will directly change the flying direction of the arrow, such as the arrow's upper finger (index finger) is too strong or the diffusion is lagging behind, and the arrow is high; The arrow pointing down (middle finger and ring finger) is too hard or lagging behind, and the arrow is low; When unfolding, the flexor is not smooth or buckled internally, leaving an arrow; Loose or outward, the arrow is tilted to the right. Aiming at the inconsistency of manual spreading, a compound bow spreader was developed, which basically solved the problem of human factors affecting the equipment. From the development of recurve bow's three fingers on the bowstring to the development of the points of the compound bow expander on the bowstring, the accuracy of archery has been greatly improved.

5, shock absorption difference

The vibration of the bow itself will inevitably affect the flight of the arrow. The greater the tension, the greater the vibration. Recurve bow's shock absorption depends on the counterweight shock absorption rod installed on the bow handle and the shock absorption rubber block bonded by the upper and lower bow pieces. The compound bow can also be equipped with shock absorption rubber blocks on the sight and bowstring cable limit rod. This makes up for the excessive vibration caused by the large launching force.