谨以此帖，终结瞄估之争！

1、如果弹弓的动力，是用理想的金属材料制成的弹簧提供动力，那么，我也瞄，一直瞄。
2、假如弹弓的动力仍是用目前流行的乳胶皮筋提供动力，在全球最好的枪械制造厂，使用现代数控技术和光刻机水准工匠，制成一支高度精密的板机式弹弓枪，装在支架上进行射击，准度如何？换一个角度说话，无论现在瞄打者，无论如果折腾和按瞄打公式进行瞄准，也达不到前述的那支弹弓枪水准。
3、那支精良的板机式弹弓枪准度如何？效果是一般般，甚至乏善可陈，原因何在？问题出在材料上。
4、弹弓皮筋使用的乳胶这种材料的性质，决定了它的每一次回弹力的方向不能高度稳定。每一次回弹力指向都有不同，那怕你定点定线到极致，你的身体与前后手保持纹丝不动地时松皮兜。乳胶皮筋的回弹，就算每一次击打时，气温、风向等各种外界条件完全一致，它的回弹方向，仍存在随机性。这里简略展述一下，不多说。皮筋里面，是一束高分子材料，里面的分子在每一次回弹与收缩过程中，不断地粘合、挤压等等。比如说，拉开皮筋后立即松兜，回弹性能好一些。拉开后，不动，各分子之间立即开始粘合，粘合度取决了环境温度、湿度与拉升比，粘合数秒后达到稳定态，而此时再松后手，回弹效能低了许多，我们在实践中称之为皮筋泄力。问题不光是这些，如果在气温不怎么高的条件下，一条皮筋的两边或者说不同部位，这种回弹效能也是不稳定的，导致前后两弹完全一致的击发方式而弹着点不同，因为皮筋的每一次拉升后，合力指向具有随机性。再打个比如，在击打前，把一条皮筋用手搓搓，另一条不动，再瞄准击打，看弹着点有何变化？为什么气温过低时，皮筋的回弹效能更好而准度降低，而温和天气更容易发挥水平？不再展述。不再展述的原因是麻烦，而且有显得本衣似乎学历有蛮高之嫌！
5、因前述之故，无论如何瞄，弹着点总会有一个散布。这个散布的大小，取决了瞄的能力和皮筋的质量。
6、那么，打弹弓，瞄瞄，到底有用吗？当然有用。用处在于，对于新手而言，通过瞄，能够迅速找到一个散布范围。实践中可以看到瞄打弓手的弹着点，就算不中，弹着点也离目标不远，8、9不离10的。
9、但是，瞄打弓手如果只瞄，不在其他方面下功夫，那么，他永远就只能打出那个散布，中不与中，看天。此时，叫做瞄打遇到了瓶颈。瓶劲不破，再打5年，也是那个样子。
10、然而，现实中，有瞄打高手，确实能够做到5米复点，10米竞技靶连中上百下，这是何故？答案是，他们在估，估打的估。他们瞄得很好，通过瞄，把散布已经缩小到了一个小范围，然后在这个小范围里，进行估打。
11、估打如何打？眼法、手法、心法。眼法与心法，暂时不说，容易招骂。说说手法。手法，就是前后手感知两边皮筋合力的能力。皮筋回弹力的方向，无论有多大的随机性，弓手只把握本次开弓时的合力所指。至于下一次开弓合力如何，下次再说。合力指向目标，就松开皮兜。
12、任何新手在无人指导的情况下，都会凭本能地从瞄打开始。如果不瞄，他会感觉是在乱打。事实上，新手第一次拿起弹弓，他打出去的第一弹，确确实实弹在乱跑，无准度可言。
13、自从一个叫湿地青衣的人出现在论坛之后，能够让新手在不瞄的前提下，让新手“乱打”出去的每一弹实现价值。新手，就是盯着目标，尽可能地把精力，集中于目标，之后朝目标，只管打、打、打。
14、青衣不建议新手从瞄打开始，因为瞄打开始，很容易出现一些对弹弓的误解，反而耽误了练弓。不良症状是总怪弹弓不好、皮筋组不好，或者辅助工具少了，直至把家里弄成了作坊，弹弓博物馆了，而弹弓仍然没有打好。
15、对于高手而言，无论是从瞄开始，还是不从瞄开始，最终的击打方式，都是一致的。瞄打高手，先通过瞄，找到散布，之后在散布范围内估。估打高手，因为多年的练习，不需要瞄，开弓一指，也指向了瞄打高手通过瞄所能找到的那个散布，之后在这个散布内，去估。板机弹弓为什么不行？因为解决了瞄的散布问题的同时，却失去了估的余地。
16、最终，九九归一，都要估。估打，能够让回弹具有随机性的乳胶皮筋弹弓实现象狙击枪一般的精准，但仅局限于近距离，因为初速限制。
17、正是因为都要估，才让弹弓运动具有无限的魅力。因为估的能力，是无止境的，高手在近距离，能够让散布趋向于0.
18、何谓散布为0？青衣最后在此下一个定义供大家参考：散布为0，不是打出去的每一弹着点完全重合，是打出去的所有弹痕之中的任一2弹，都有重叠。比如8的钢珠，散布小于16，叫做散布为0.为什么如此定义？简单回答是，擦边也算中了。
0散布是小于2倍钢珠直径。弹弹连在一起，手拉手，没有散。都没有散，叫0散。

我先占个沙发。眼看目标一个点干就完了。

玄而又玄，晕                  

精辟

结束的了么？

接大师定义，看直播间上那些扳机弓，散布为O了。

大师还记得自己说过的话吗？以下纯复制粘贴——当然，瞄打，在千遍万遍地练习几个固定距离固定高度如10米、15米........之后,完全公式化了,能够做到神准,曾经疯传的什么10米打一个什么东西连中几十几百下破什么结屎泥纪录，把估打大师武汉某都弄得只好回家再养牛的，就是这种情况。

莫非，该瞄打大师被皇上招安了，赐予了估打的名份？呵呵，说个笑，别介意。

去年楼主说不存在瞄中有估，元旦一过，就变成瞄估一家亲了

认认真真地跟大师说个心里话：我佩服大师心细如发和钻研精神，对皮筋的不稳定性研究颇有心得，那个软联使皮筋指向稳定的理论我十分赞同，不过我不用软联，用圆头有异曲同工之妙，还自制前尖撑头以使更稳定，有空再请大师指点。这里说另一个请求：大师能说说意打心法的防抖作用吗？皮筋的不确定性已远小于手的抖动了。

老仙手持开山手杖随意挥舞，仙法所至之处一片生机盎然，枯木逢春。

事实的确如青衣老哥所言。丝竹再补充两点资料：
△皮筋储存热能 而不是机械能
它就像气体那样储存后释放能量
你在放空二氧化碳罐的时候就会发现罐子变冷了
那就和释放皮筋时一样 原先里面的原子排序正常
如此便破坏了有序的原子链
——以上来自德国大光头视频字幕
△弹弓的动能来源于人手拉皮筋；人手拉皮筋造成皮筋分子运动，产生并储存热能；撒放时释放能量转化为动能。拉开皮筋后静止不动，皮筋储存的热能就会迅速散失，能量降低，也就是通常所说的皮筋泄力。
△通过弹弓枪的研究我发现，纯粹靠皮筋的回弹的话，二十发钢珠下来，十米的距离最少要有五公分的散步。也就是说，皮筋的回弹，并不是大家想的这么一致，并不是我一动不动，皮筋就会发发都在一个位置。{测试弹弓枪的散步时候是夹在台钳上的}皮筋伸缩，并不一致。这点证明，纯粹的瞄打，并不实用。应该加以感觉的配合。至于怎么加入，还是靠自己去意会，这东西，没有不变的程序。——小策子《关于弹弓如何看目标》

哈哈哈 受教了
然并卵---瞄估之争继续......

丝竹东山 发表于 2021-1-3 11:15
事实的确如青衣老哥所言。丝竹再补充两点资料：
△皮筋储存热能 而不是机械能
它就像气体那样储存后释放能 ...

你说得如此本质，不适合科普的。就是弹性势能一笼统吧

湿地青衣 发表于 2021-1-3 12:30
你说得如此本质，不适合科普的。就是弹性势能一笼统吧

丝竹东山 发表于 2021-1-3 15:22

好图好图

The following is from a forum in China：

1. If the power of the catapult is provided by springs made of ideal metal materials, then I also aim, always aim.

2. If the power of the catapult is still provided by the current popular latex rubber band, in the world's best gun factory, using modern numerical control technology and lithography level craftsman, we can make a highly precise plate machine catapult gun, which is installed on the bracket to shoot. What's the accuracy? From another angle, no matter who is aiming now, no matter if he is tossing and aiming according to the aiming formula, he can't reach the level of the catapult gun mentioned above.

3. What's the accuracy of that excellent trigger catapult gun? The effect is mediocre, even poor. Why? The problem is in the materials.

4. The nature of the latex used in the elastic band of the catapult determines that the direction of each rebound is not highly stable. Every rebound point is different, even if you set the line to the extreme, your body and hands remain motionless when loose leather pocket. The rebound direction of latex rubber band is still random, even if the air temperature, wind direction and other external conditions are completely the same every time. Here is a brief introduction. Inside the rubber band is a bunch of high polymer materials. The molecules in the rubber band are continuously bonded and extruded in each rebound and contraction process. For example, the elastic property is better when the elastic band is loosened immediately. The adhesion degree depends on the ambient temperature, humidity and pull-up ratio. The adhesion reaches a stable state after a few seconds. At this time, when the back hand is released again, the rebound efficiency is much lower. In practice, it is called rubber release. These are not the only problems. If the temperature is not very high, the rebound efficiency of the two sides or different parts of a rubber band is also unstable, which leads to the completely consistent firing mode of the front and back bullets and the different impact points, because after each pull of the rubber band, the combined force direction is random. For example, before hitting, rub one rubber band with your hand, keep the other one still, and then aim at hitting to see if the impact point changes? Why is it that when the temperature is too low, the resilience of rubber band is better and the accuracy is lower, while it is easier to play the level in mild weather? No more. The reason why I don't show you any more is that it's troublesome, and it seems that I have a high education!

5. Because of the above, no matter what the aim is, there will always be a dispersion at the impact point. The size of this dispersion depends on the aiming ability and the quality of the rubber band.

6. So, is it useful to shoot a catapult and aim? Of course it works. The purpose is that for beginners, they can quickly find a spreading range by aiming. In practice, we can see that the impact point of the aiming and hitting Archer is not far from the target, even if it is not hit, 8 and 9 are not far from 10.

9. However, if the aiming Archer only aims and doesn't work hard in other aspects, he will always be able to make the dispersion, whether it's in the middle or not, and look at the sky. At this point, it's called aiming and hitting, and there's a bottleneck. The strength of the bottle doesn't break. Five years later, it's the same.

10. However, in reality, there are aiming and hitting masters who can really achieve 5-meter multiple points and 100 times in 10 meter competitive target series. Why? The answer is, they're estimating. They're estimating. They aim very well. By aiming, they have reduced the dispersion to a small area, and then, in this small area, they carry out evaluation.

11. How to play? Eye method, manipulation and mental method. If we don't talk about eye method and mind method for the time being, it's easy to scold. Talk about the technique. Technique is the ability to feel the resultant force of the rubber bands on both sides. No matter how random the elastic direction of the elastic band is, the archer only grasps the point of the resultant force when the bow is opened. As for the next bow opening, let's talk about it next time. Release the skin and point to the target.

12. Any novice in the case of no guidance, will instinctively start from aiming. If he doesn't aim, he'll feel like he's beating around. In fact, the first time a rookie picks up a slingshot, the first shot he plays is really running around with no accuracy.

13. Since a person named wetland Tsing Yi appeared in the forum, it can let the novice realize the value of every shot they "hit" without aiming. Novice, is staring at the goal, as far as possible to focus on the goal, and then toward the goal, just play, play, play.

14. Tsing Yi doesn't recommend novices to start with aiming, because it's easy to misunderstand the slingshot and delay the bow practice. The bad symptoms are that the slingshot is always bad, the rubber band is not good, or the auxiliary tools are few, until the family has become a workshop and the slingshot Museum, but the slingshot is still not played well.

15. For the master, whether from aiming or not, the final way of hitting is the same. Aiming master, first through aiming, find the spread, and then estimate in the range of spread. Because of many years of practice, it is not necessary to aim. When you open your bow, you also point to the distribution that the aiming master can find through aiming. Then, you can estimate in this distribution. Why can't the trigger slingshot work? This is because we have solved the problem of aiming dispersion, but at the same time, we have lost the leeway of estimation.

16. In the end, we have to evaluate everything. The estimated hit can make the random rebound latex rubber band catapult achieve the accuracy like a sniper gun, but it is only limited to close range, because of the initial speed limit.

17. It is precisely because we have to estimate that the catapult sport has infinite charm. Because the ability to estimate, is endless, master in close range, can make the spread tend to 0

18. What is dispersion 0? The last definition of Tsing Yi is for your reference: if the dispersion is 0, it is not that every impact point of the shot is completely coincident, but that any two bullets in all the bullet marks are overlapped. For example, if the dispersion of 8 steel balls is less than 16, the dispersion is called 0. Why is this definition? The simple answer is that the edge is right.

0 is less than twice the diameter of the ball. The bullets are linked together, hand in hand, not scattered. It's not scattered. It's called 0 scattered.

以前，怀疑大湿是推销皮筋和钢珠的，因为他推广的臆打需要打百万发才能小成。
后来，发现误会了大湿，因为他绑的皮筋只有2倍拉伸率，一副皮筋能用一年；他的弹丸主要是用随手捡来的石子，基本不用钢珠！

瓦尔德外尔 发表于 2021-1-4 08:29
以前，怀疑大湿是推销皮筋和钢珠的，因为他推广的臆打需要打百万发才能小成。
后来，发现误会了大湿，因为 ...

我们玩弓有很多讲究，皮筋是否一样对称，钢珠是否圆滑等等，否则影响准度！您看人家"青衣"，那才叫一个"随意"！路边拣个石籽，皮筋两边如锯齿状，绑皮兜处和撑头处的皮筋多出那么多也不剪掉，还有那弓…

萍水相逢 发表于 2021-1-5 01:17
我们玩弓有很多讲究，皮筋是否一样对称，钢珠是否圆滑等等，否则影响准度！您看人家"青衣"，那才叫一个" ...

其实，像大湿那样随意玩的弓友不在少数，他只要不攻击玩得更加细致的竞技玩家就好！