Types of Tennis Balls
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Some terms

Hybrid Strings. A combination of any two types of strings or penetration depths. The most common combination of the so-called wire on the longitudinal (babolat pro hurricane tour, luxilon) and soft strings on the transverse (natural or multi-fiber). This method of stretching is a salvation for those who constantly tear strings. In addition, it is the most common hybrid used by professionals.

Axial moment of inertia. A property that determines how stable the racquet is during off-center hits, including its torsion resistance and the area of ​​the playing spot. It is sometimes also called torsion weight. Models with a large moment of inertia are more resistant to torsion during off-center impacts. Models with a wider head will have a greater moment of inertia. Elongated rackets, as a rule, have a greater moment of inertia and therefore resist torsion better than standard midplus.

The parameter can be increased by adding weighting agents at 3 and 9 hours, using the largest handle size, which is convenient to play with and regularly changing worn coils and overgrips.

Recommended tension. The tension with which it is necessary to pull the racket to give it optimal playing characteristics.

Elasticity. An often used term to describe the ability of a string surface to respond to external influences. This term is synonymous with the term elasticity, a more resilient string is more sensitive and expressive, and provides greater ball speed and power. More precisely, resilience is the speed at which the string surface returns to its original position after contact with the ball. After some time, the string surface loses its elasticity and begin to transfer less energy. This loss of elasticity entails a loss of sensitivity when playing.

Frame perturbation – the initial high-amplitude oscillations of the racket during contact with the ball, often entailing vibration of the body. It is believed that disturbance of the body causes more hand, elbow, and shoulder injuries than vibration. Usually a smaller, stiffer lightweight racket with high tension generates greater vibrations than flexible, lightweight frames that are not very tight.

Off-center strokes also increase the amount of vibrations transmitted to the tennis player’s hand and hand. After-sales methods to reduce body vibrations include weighting the frame, reducing tension, using thinner strings with greater penetration depth and increasing the size of the handle to reduce torque. String vibration dampers are ineffective in combating body vibrations.

Game (central) spot. The region on the string surface that provides the greatest power and accuracy with the least amount of disturbance. In fact, there are 3 game spots: 1st – this is the center of collision (CA), it provides the least amount of initial vibrations transmitted to the hand. It is generally believed that fluctuations that arise in this way can potentially do the most harm to the tennis player’s arm. The second game spot is the center point. When a ball hits it, the least amount of vibration is transmitted. The vibration of the racket’s body is what a tennis player feels after contact with the ball (long-term, low-frequency vibrations) in some models (usually more flexible). So far, unpleasant jitter of the case is not considered as a potential hazard as its vibrations and can be effectively reduced using technologies used in handles, such as asPrince’s Air + ComfortHandle or Head’sShockStopTechnology technology. Game spot No. 3 is the area with a maximum coefficient of restitution (return) or maximum power of a racket. This is the lowest of the 3 game spots. The location of the game spots is determined by several factors, including weight, balance, length, head size and tension.

Swing weight. A measure of how hard the racket is felt during the backswing, that is, its maneuverability. Also known as moment of inertia. The parameter depends on several factors, including weight, length, balance, head area.

Models with a large swing weight are more powerful, but have less maneuverability, although in general they can weigh not so much.

In addition, it should be noted that models that have a large swing weight can generally not weigh so much due to the fact that more weight will be concentrated in the head. This trend was initiated by Wilson using Hammer technology. The goal was to maintain maneuverability without losing power due to the distribution of most of the total mass in the upper part of the rim, where there is contact with the ball. The weight of the swing can be increased by adding weight to the handle or by increasing the length of the corus. The parameter cannot be reduced, as well as the total weight, unless you remove the protective bumper, or reduce the length. Keep in mind when buying a racket that it is better to make a mistake in the lighter side and then add weight if necessary.

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