(1) The appearance of badminton should be neat, the wrapped ball cover should be smooth and wrinkle-free, the feathers should be white, and the insertion angle should be consistent;
(2) The feather shaft is slightly thick and straight, and the glue is even, so it should be hard and elastic when held by hand and cannot be deformed;
(3) When trying to play badminton, its flight stability is good, and it does not shake or drift when rotating forward. There should be no obvious difference in the speed of badminton in the same bucket.
The quality of badminton can be observed from the following aspects:
1, the feathers are fine and tidy, and each feather has good consistency.
2. Feathers are arranged in a neat angle, and the trunk of feathers is straight and has a certain hardness.
3. The feather mouth has good roundness and standard size.
4. The quill and the ball holder are firmly combined, and the combination is firm.
5. The whole feather is coaxial with the ball holder.
6, the ball is tight but not soft, the sphericity is standard, and the inner glue is less.
7. The overall weight of the ball is appropriate and the weight distribution is reasonable.
Naturally, compared with these standards, the common defects are:
1, feathers are irregular and uneven.
2. The arrangement of feathers is disordered and the angles are not uniform. Feather shaft is arc-shaped with poor hardness.
3. Feather openings are not round, some are big and some are small.
4. The quill is not firmly bonded and loose.
5. There is eccentricity between the feather body and the ball holder.
6. The ball holder is soft and there is too much glue in it.
7. The weight of the ball is not suitable, some are light, some are heavy, and some are supported with screws.
A good badminton player should have a good handle and not lose his hand. The ball is crisp, fast and steady, and the deceleration is moderate. The flight rotates smoothly without shaking. Turn back quickly and accurately, and keep the direction accurate. The specific feeling is just my own experience. When buying a ball, throw it up about 1 m and watch the ball fly and turn. Give it a try if possible. If you meet a favorite ball, don't be depressed, buy more, because this batch of quality is difficult to catch up with. Generally, there are at most two balls in a tube, the quality is slightly poor, but not too far. If there are many poor balls, quality is also a problem.