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本帖最后由 TNTTVSGOU 于 2024-6-7 13:59 编辑
活塞重量
活塞行程最重要的部分不是在开始时，而是在撞击气缸盖时的结束。这是 bb 应该离开枪管的时候，这是您希望 bb 拥有尽可能多的能量的时候。如果由于某种原因，活塞在其行程结束时减速，则 bb 将无法达到其最大潜力，因为活塞没有达到其最大速度。现在，如果活塞太轻，它可以加速得非常快，但随着气缸中压力的增加，它可能会开始在这个高压垫上反弹，因为它没有足够的惯性来推动压力垫。要解决这个问题，您可以给活塞增加一些重量以使其具有更大的质量。这反过来又会给它更多的惯性来推动这个压力垫。因此，活塞在开始时可能会移动得更慢，但它可以更快地完成，因为它不会卡在高压空气垫上。
注意：有一点，如果你增加太多的重量，活塞会开始得很慢，结束也很慢。
以下是活塞重量如何影响活塞速度的一些示例：
弱弹簧 + 低质量活塞 = 活塞行程完成速度快
弹簧弱 + 中等质量活塞 = 活塞行程完成中等
弱弹簧 + 高质量活塞 = 活塞行程完成缓慢
弱弹簧 + 超高质量活塞 = 活塞行程完成速度非常慢
中弹簧 + 低质量活塞 = 活塞行程完成中等
中弹簧 + 中质量活塞 = 活塞行程完成速度快
中弹簧 + 高质量活塞 = 活塞行程完成中
等 中弹簧 + 超高质量活塞 = 活塞行程完成缓慢
强弹簧 + 低质量活塞 = 活塞行程完成缓慢
强弹簧 + 中质量活塞 = 活塞行程完成中等
强弹簧 +高质量活塞 = 活塞行程完成速度快
强弹簧 + 超高质量活塞 = 活塞行程完成适中
正如您在最底部看到的，超高质量活塞仍然没有获得最佳效果，因为它太重了。因此，您甚至可以为坚固的弹簧增加过多的重量。
帮助阻止压力垫发生的另一件事是确保空气喷嘴孔尽可能宽。（但不要让空气喷嘴的壁太薄）。此外，您可能会发现放入稍弱的弹簧实际上可以提高步枪的 fps。这是因为压力不会积聚太多，因此活塞可以在不碰到压力垫的情况下完成其全行程。所以最后不要放慢速度。
总的来说，没有公式可以做到这一点，因为有太多的变量。所以实验。
我通常只是将电焊料缠绕在螺栓作用活塞的轴上，然后用一层电工胶带固定它。如果将焊料紧紧地缠绕在活塞上，这种情况会持续很长时间。它也是可调节的，而且非常便宜。我通常喜欢从大约 30 克的活塞重量开始，然后一次增加 10 克，然后重新测试以查看是否有所改善。对于强劲的弹簧，您可能需要总共约 70-80 克的重量。
以上机翻，原文
Piston weights
The most important part of a pistons travel is not at the start but at the end when it hits the cylinder head. This is when the bb should be exiting the barrel and this is when you want your bb to have as much energy as possible. If for some reason, the piston slows down at the end of it's travel, then the bb will not reach it's maximum potential because the piston did not reach it's maximum speed. Now if a piston is too light, it can accelerate really fast but as the pressure builds up in the cylinder, it can start to bounce on this high pressure cushion because it does not have enough inertia to push through the pressure cushion. To fix this you can add some weight to the piston to give it more mass. This will in turn give it more inertia to push through this pressure cushion. So the piston may travel slower as the start but it can finish faster because it does not get stuck on a high pressure cushion of air.
NOTE: There is a point though where if you add too much weight, the piston will start off slow and also end slow.
Here are some examples of how piston weight can affect the piston speed:
Weak Spring + Low Mass Piston = Piston travel finishes fast
Weak Spring + Medium Mass Piston = Piston travel finishes moderate
Weak Spring + High Mass Piston = Piston travel finishes slow
Weak Spring + Extra High Mass Piston= Piston travel finishes very slow
Medium Spring + Low Mass Piston = Piston travel finishes moderate
Medium Spring + Medium Mass Piston = Piston travel finishes fast
Medium Spring + High Mass Piston = Piston travel finishes moderate
Medium Spring + Extra High Mass Piston = Piston travel finishes slow
Strong Spring + Low Mass Piston = Piston travel finishes slow
Strong Spring + Medium Mass Piston = Piston travel finishes moderate
Strong Spring + High Mass Piston = Piston travel finishes fast
Strong Spring + Extra High Mass Piston = Piston travel finishes moderate
As you can see at the very bottom, the extra high mass piston still did not get the best result as it was too heavy. So you can even add too much weight to a strong spring.
Another thing to help stop the pressure cushion from occurring is to make sure that the air nozzle hole is as wide as possible. (But do not make the walls of your air nozzle too thin). Also, you may find that putting in a slightly weaker spring can actually increase the fps of the rifle. This is because the pressure does not build up so much and so the piston can go through it's full travel without hitting a pressure cushion. So not slowing down at the end.
Overall, there is no formula to doing this right as there are too many variables. So experiment.
I normally just wrap electrical solder around the shaft of a bolt action piston and the hold it on with a layer of electrical tape. This lasts a very long time if you wrap the solder tightly around the piston. It is also adjustable and very cheap. I normally like to start with a piston weight of about 30gm and then increase it by 10gm at a time and retest to see if it improved. For a strong spring you may want a weight of about 70-80gm in total.
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发表于 2024-6-7 13:54:56
