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AK-47在水下的射击(第一部分) – 译学馆
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AK-47在水下的射击(第一部分)

Slow Motion of an AK-47 Underwater (Part 1) - Smarter Every Day 95

Hey,it’s me Destin.
嗨 我是Destin
This week on Smarter Every Day
在本周《机灵日》中
I’m going to trick you into learning science using a gun in a high-speed camera.
我将用一把枪和一台高速摄像机带你走进科学
You remember the old pistols underwater video?
你们还记得那个老式手枪在水下射击的视频吗?
Well this week I’m gonna do
这周我要用一架更好的高速摄像机
with a better high-speed camera and a bigger gun.
和一把更大的枪来拍摄一个类似的视频
[music & sizzle]
[音乐 电动工具]
OK here’s the setup.
好 这就是我们的装备
This is my dad’s AK-47.
这是我爸爸的AK-47
First things first. The weapon is clear.
首先 这把枪是空膛状态
So, on the back of this thing there’s a little tab that
那么 在枪体的后半部分有一个小部件
the stock for the weapon,
用来安装枪托
you can see it’s captured right here,
你们可以看到它就在这里
so all I’ve done is I’ve created the reciprocal of that out of metal.
所以我只需要用金属做出跟它契合的部件
So we have that on this side,
因此我们在这边做了这个
and on the other side we capture it with a J-bolt.
在另一边我们用钩头螺栓固定住
So you can see, clicked in position.
来看 对准位置卡进去
And here, captured with a J-bolt.
这一边 我们用一个钩头螺栓固定好
If you don’t know your way around an AK-47 it’s pretty simple.
要是你不知道该怎么拆卸AK-47 其实很简单
You just take the top cover off,
你只需要把机匣盖打开
take this spring out,
把这个弹簧拿下来
and then you can pull the bolt back.
然后把枪栓拉到后面
And when you pull the bolt back which
当你把枪栓拉出来的时候
is located right here you see this large piston.
就在这个位置 你能看到一个大活塞
Now this piston is what operates the mechanism that re-chambers the next round.
这个活塞就是使枪重新上膛的装置
It’s pretty simple the way these things work.
它的工作原理很简单
As a bullet travels down the barrel,
当子弹从枪管里射出
it passes a port right here,
子弹会通过这里的导气孔
and this port allows gases to flow into a cylinder
这个导气孔让气体流入气缸
which drives this piston back,
气缸驱动活塞回来
which moves the bolt
带动枪栓
and the bolt re-chambers another round out of the magazine.
枪栓将下一颗弹从弹夹推进膛内
So here’s the question.
那么这就有个问题
As the gas flows into the cylinder
当气体流进气缸里
and begins pushing down this piston.
然后开始推动活塞
What happens to all this water?
如果发生在水里会是什么情况?
My hypothesis is that it’s going to slow the bolt down.
我的猜想是这会让枪栓慢下来
But we’re gonna use the high speed footage to determine if this is correct.
所以我们打算用高速摄像机检验这是否正确
We have a little bolt cover here and we’ve painted the end of it white
我们已经把一个小枪栓盖的末端涂成了白色
so that we can measure the velocity of it in a high speed video.
这样我们就能用高速摄影机来测量它的速度
First shot, air.
第一枪 在空气中试验
As you can see here
正如你看到的
we’re firing directly into this dirt berm.
我们直接向这个土堤开火
3..2..1.. [Gunshot]
3 2 1 [枪声]
[Several gunshots]
[几声枪响]
[Slowed down gunshot]
[慢动作击发]
Alright, time for water.
好 是时候在水里试验了
[Music]
[音乐播放中]
3..2..1.. [Gunshot]
3 2 1 [枪声]
[Laughter]
[笑声]
That’s a lot more water than last time.
这次比上次多了很多水
[Music]
[音乐播放中]
OK we’re gonna see if it still works. See if I owe dad another weapon.
好了 我们来看看这把枪还能不能用 看看我是不是又欠了老爸一把枪
[Gunshot] Still works.
[枪声]还可以用
Alright so what’s the answer?
好的 那答案是什么?
Does the bolt come back faster when the gun is in the air,
什么情况下枪栓复进更快 是枪在空气中时
or when the entire thing is under water?
还是整个枪身在水下时?
Before I show you the answer I need to apologize to you.
在展示答案之前我要向你道歉
If you look back at the pistols underwater video
如果你回去看这个水下的手枪视频
you can see that I just broken out the back side of the aquarium
你会发现我刚刚只是打碎了水箱的背面
but the sides stayed intact.
但是两侧完好无损
On this one, I used tempered glass instead of normal plate glass.
这一次 我用强化玻璃来取代普通平板玻璃
On tempered glass if you just break the edge the entire pane will shatter
如果你弄坏强化玻璃一角 那么整块玻璃都会碎掉
so obviously I messed up the experiment. I apologise for that. So here you go.
显然我把整个实验搞砸了 我为此道歉 来吧
Look at the difference between air and water. Enjoy.
看看在空气中和水下的情况有什么区别 请欣赏
[Music]
[音乐播放中]
So I’ve got two theories about why water is faster.
我想出两种在水下时更快的理论
Well if you think about it,
好好思考一下
if you have a round in the chamber you have a big column of water in front of it.
如果你枪膛中的子弹正前方有一段圆柱形水柱
So you have to accelerate all of that mass instead of just the mass of the bullet.
那你得对水和子弹的共同质量而不仅仅是子弹质量进行加速
That makes sense
这样就说得通了
because you can look here and see that the primer’s blown out, indicating that
因为你可以通过看这底火爆炸的痕迹
there’s higher chamber pressure when we do that.
认识到此时燃烧室有很大压力
That means that there’s more force pushing on this piston.
那意味着有更大的推力在推动活塞
Also water is incompressible whereas air is compressible.
并且水是不可压缩的但空气可以
That means that the pressure information gets to the piston faster.
这意味着压力会更快传到活塞
Alright,well I hope you enjoyed that.
好吧 我希望你能喜欢本视频
My intent was to make something that you not only learn from that you enjoyed
我的目的是做一些寓教于乐的视频
and earn your subscription too.
也希望你可以订阅我
But unfortunately I kind of goofed up the aquarium thing.
但不幸的是 我选错了制作水箱的材料
So maybe I can earn your subscription on part two this video .
不过你们可以订阅下我来看这个视频的第二部分
If you want to see that, just click where I’m at now or click the outtakes
如果你想看到这个视频 只需要点击我现在的位置或者点击“油管”
and you can check it out.
你会找到的
Don’t try this. I’ve got a little bit more experience than you might think.
请勿尝试模仿 我比你想的要更有经验
Anyway,I’m Destin. You’re getting Smarter Every Day.
总之 我是Destin 你正在收看的是《机灵日》
Have a good one.
祝你有愉快的一天
[Music]
[音乐播放中]
I think now is a good time to discuss the terms of our agreement.
我觉得现在刚好谈一下我们的条件
You replace the gun if it harms it in any way. [Laughter]
枪如果坏了你得赔 [笑声]
Now wait, this doesn’t sound like a discussion, it sounds like a mandate. [Laughter]
等等 这听起来不像在商量 像是命令 [笑声]
3..2..1.. [Click].. [Laughter]
3 2 1[咔哒声][笑声]
Oh it was a bad round.
噢 这是颗哑弹
Yeah your tarp idea was terrible. [Laughter]
是的 你用油布的主意真是糟透了[笑声]
Completely in the wrong spot.
犯了个天大的错误
The tarp, to catch all the glass.
用油布防止玻璃飞出去
[Vacuum cleaner] It’s a lot more fun if you pretend you’re an elephant picking up peanuts.
[真空吸尘器] 如果你想象自己是吸花生的大象会有趣得多
Now you may have noticed there was a bubble of air that came out here through these ports.
现在你可能注意到有气泡从这些端口中冒出来
We’ll talk about that in part two of the video.
我们会在第二部分的视频中讨论这些现象

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视频概述

AK-47在水下跟在空气中的击发有什么不同呢?本视频为你揭晓答案

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视频来源

https://www.youtube.com/watch?v=W5K6YymPe_M

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