B1 中級 77 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
- Five.
"Three. Two. One. Pull up."
- I'm experiencing 1.8gs right now, which means I weigh
about 1.8 times what I normally would.
I've been instructed to keep my head front and centre to avoid nausea.
But all this is about to change
because this is the European Space Agency's zero-g flight.
Those are students doing research.
This is Neil, who's here for my safety.
And we're about to go into freefall.
Whoa!
Whoa!
And here's the confusing thing.
We are still going up right now.
That camera is stabilised to the actual horizon,
and it's not until 10 seconds into our 20 second parabola,
into our manoeuvre, that we clip the apex and start heading
back down towards the ground.
And here we go, 1.8gs.
- In this special aircraft, we divide the three axes.
There is pitch, roll and thrust,
and each pilot flies one axis.
In every other aircraft, one pilot flies the three axes and
the other one manages the systems, talks on the radio, and so on.
To fly parabolas, we need to fly only one axis by one pilot.
We try to avoid any turbulence.
Any turbulence is a nightmare for us.
- The two control sticks, just like any plane,
are completely locked together, so they always move at the same time.
So one of the pilots is using
effectively elastic bands on either side of his stick
so that he doesn't affect the axis of the other pilot.
One of them does the pitch, the other one does the roll
whilst trying not to upset the pitch.
- In 1971, the Apollo 15 astronauts tested something on the moon:
The idea that all objects, no matter their weight,
fall at the same speed if there's no air.
They used a hammer and a feather, and they landed at the same time.
ASTRONAUT: "How about that?"
- But the weirdest thing is that if that astronaut had thrown that hammer,
it still would have been in free fall
from the moment it left his glove to the moment it hit the ground.
The only pull on it is from the gravity of the moon.
The maths work out the same
no matter what speed or direction it's going relative to us.
That's what we just did here.
If it sounds weird, sure, but we just proved it.
And we're about to prove it again.
- Every five parabolas or ten parabolas, we change
to maintain the best accuracy of the parabolas, especially
on the pitch axis because it's the most demanding flying technique.
So after five or ten parabolas, you are so tired and you
have to go on to another less demanding axis.
PILOT: "3, 2, 1, pull up."
- This parabolic manoeuvre isn't the normal kind of thing
that you do in an Airbus, and the software in this plane
hasn't been modified because to do so would be a huge effort to re-qualify it.
With the normal software, you have the normal alarm
saying, "This doesn't seem like a very good idea, guys,"
and one of the pilots that isn't too busy on the other two axes
is turning off the alarms that we don't need to worry about
and keeping track of the ones we might need to worry about.
PILOT: "Injection."
- So those pilots are keeping us on the exact path
that an object would take if you hurled it into the sky
at hundreds of kilometres per hour and there was no air.
They're giving us this little protective bubble of zero-g to fly around in.
There is no terminal velocity here, only the design limitations of the plane.
And we're going to hit those pretty soon, along with something else.
Because when you're descending this fast towards the ground,
the Earth approaches pretty quickly.
Thank you, Neil!
If you're a Masters or PhD student from an ESA member state,
and you want to be one of the people back there,
then have a look at the Fly Your Thesis program.
The link is in the description.
Thank you, Neil!
I got it, I got it, we're good.
And down.
Oooph.
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

How Zero-G Planes Work

77 分類 收藏
林宜悉 發佈於 2020 年 4 月 1 日
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔