Name: 讓你看見超讚隧道的好藉口！ (This is an excuse to show you a really good tunnel)
Uploaded: 2026-01-17T17:45:35.000Z
Duration: 7 min 55 s

The Catesby Tunnel in Northamptonshire, England, used to be for trains.

英格蘭 Northamptonshire 的 Catesby Tunnel 以前是給火車用的。

基礎被動語態

It was built by the Victorians in 1897, but

它是由維多利亞時代的人在 1897 年建造的，但是

fell into disrepair after the line that went through it was closed in the 60s.

在 60 年代鐵路關閉後就廢棄了。

It was abandoned for many years, but now it's a vehicle testing facility.

它被閒置了很多年，但現在是一個車輛測試設施。

This is a more realistic version of that, where the air isn't moving, but the car definitely is.

這是一個更真實的版本，空氣不動，但車子絕對會動。

So Catesby Tunnel is 2.67 kilometers long.

It's got a cross section of 42 meters squared, perfectly straight.

它的橫截面是 42 平方公尺，而且是完全筆直的。

It's quite an amazing feat considering the Victorians built it without a laser level.

考慮到維多利亞時代的人是在沒有雷射水準儀的情況下建造它的，這真是一個令人驚嘆的成就。

Obviously, the surface of the earth is curved, but Catesby Tunnel is flat.

當然，地球表面是彎曲的，但 Catesby Tunnel 是平的。

So if you put a laser line along it, we're within 3 millimeters of being off that laser line.

所以如果你沿著它放一條雷射線，我們離那條雷射線的偏差在 3 公釐以內。

When we first inquired about repurposing Catesby Tunnel, it was totally derelict.

當我們最初詢問關於 Catesby Tunnel 的再利用時，它完全是廢棄的。

They ripped up the track, they'd taken away the ballast, they destroyed the drainage.

他們拆掉了軌道，移走了道砟，破壞了排水系統。

So at the far end, the tunnel was actually knee deep in water.

所以到了隧道的最裡面，裡面積水到膝蓋那麼深。

There were no facilities or utilities here.

There were bats living within the tunnel that we had to tread carefully around.

隧道裡住著蝙蝠，我們得小心翼翼地繞過牠們。

So at the far end of the tunnel they've actually got their own bat hotel.

所以到了隧道的最裡面，他們其實有自己的蝙蝠旅館。

When we test outside, we've got the wind, we've got the rain, we've got other vehicles, we've got lumps and bumps in the road.

當我們在外面測試時，有風、有雨、有其他車輛，路面還有高低起伏。

We want to remove those and make as controlled a condition as possible.

我們想移除這些，盡可能創造一個受控的環境。

So the test is only seeing the changes that we're looking for.

所以測試就只看我們想找的那些變化。

Julian got the car up to 130 kilometres an hour very quickly, and

Julian 很快就把車速加到每小時 130 公里，然後

then he took his foot off the accelerator and just let it coast in neutral.

他把腳從加速器移開，讓車子在空檔滑行。

This tunnel's long enough to that there'll be a couple of minutes before he has to touch the brakes.

這條隧道夠長，他有幾分鐘的時間不用碰到煞車。

From that you can work out the drag and friction forces, which is really useful data for car manufacturers.

從這些數據，你可以算出阻力和摩擦力，這對汽車製造商來說是非常有用的資料。

Because Catesby Tunnel is a bit different to a normal wind tunnel.

因為 Catesby Tunnel 跟一般的風洞不太一樣。

We can't use GPS because we can't see the satellites in the sky.

我們不能用 GPS，因為我們看不到天空中的衛星。

The approach that we've come to is an image based system.

我們採用的方法是一個基於影像的系統。

There's 1200 tanks now in the tunnels and they are five metres apart and they've been surveyed to within a few millimeters each position.

現在隧道裡有 1200 個標記，它們之間相隔五公尺，每個位置都精確測量到幾公釐。

And then we measure the time it takes to go between each tag and that's picked up by this high speed camera that's working 100 times a second.

然後我們測量通過每個標記之間所需的時間，這個時間由每秒拍攝一百次的這臺高速攝影機捕捉。

And that gives us a very high Accuracy for speed of about a hundredth of a kilometer an hour.

這樣我們就能得到非常高的速度精確度，大約是每小時百分之一公里。

The tunnel is a fantastic place for this kind of measurement because there is no extraneous sunlight and sunlight is very difficult to cope with when you're working with infrared.

隧道是進行這類測量的絕佳場所，因為沒有額外的陽光，而處理紅外線時陽光非常難應付。

But I said that this was test one, and it was.

But like any video about cars, you didn't see it from just one angle.

但就像任何關於汽車的影片一樣，你不可能只從一個角度看到。

There were camera shots from all around the tunnel.

隧道裡到處都是攝影機拍攝的畫面。

To get different angles and keep it interesting.

從不同角度拍攝，讓影片更有趣。

There were shots from cameras that were attached to the car with suction cups for dynamic shots from almost impossible angles.

還有從吸盤固定在車上的攝影機拍攝的畫面，從幾乎不可能的角度捕捉動態鏡頭。

但這是一部貨真價實的汽車影片。

We don't want to see those suction cup cameras from outside.

我們不想從外面看到那些吸盤攝影機。

And we don't want to see the camera operator in the back either, because he's not there.

我們也不想看到後面的攝影師，因為他根本不在那裡。

There's got to be a little bit of unreality to this that no one will notice once it's all edited together.

必須有一點點不真實感，等到全部剪輯在一起後，沒人會注意到。

So when I said this is test one, that is actually true.

所以，我說這是測試一，這其實是真的。

But the shots from outside, we haven't filmed them yet.

但從外面拍攝的鏡頭，我們還沒拍。

We're going to have to go back and forth in this tunnel 15, 20 times before we've got every angle we need to make this look interesting.

我們必須在這條隧道裡來回跑 15、20 次，才能拍到所有需要的角度，讓影片看起來很有趣。

Do those cameras actually affect the results?

那些攝影機真的會影響測試結果嗎？

If you've got a camera on the outside of your car, how much more fuel are you actually using?

如果你的車外面裝了攝影機，實際上會多耗多少燃油？

Typically, we go out and back for a test and average over both of those sections.

通常，我們會來回跑一次測試，然後取這兩個部分的平均值。

The Turntable takes about 20 seconds to turn around.

轉盤大約需要 20 秒才能轉一圈。

We don't have access at the far end of the tunnel, so we have to turn around inside.

隧道另一頭我們無法進入，所以我們必須在隧道內迴轉。

It saves doing an Austin Powers 37 point turn at the far end.

這樣就不用在隧道另一頭做《王牌大賤諜》那種 37 點迴轉了。

所以是完全一樣的測試，只是反方向？

In order to get the best accuracy, the driver has to be very consistent and he has to do the same thing time after time.

為了得到最好的精確度，駕駛必須非常一致，而且要一次又一次地做同樣的事情。

You have to drive in a very straight line.

你必須沿著非常直線的路線駕駛。

So any deviation that adds to the distance and the drag that the car is experiencing, you can start off at pretty much any speed.

所以任何會增加車輛行駛距離和阻力的偏差，你都可以用幾乎任何速度開始。

As long as it's above the start of your coast down speed.

只要速度高於你的滑行測試起始速度就好。

You want to let the car settle a bit because the moment you put it into neutral, the car will start to rock backwards and forwards a little bit and all these little things all add up.

你要讓車子稍微穩定下來，因為你一排入空檔，車子就會開始前後晃動一點點，這些小細節都會累積起來。

So a garage door opener, it is just for the turntable?

所以車庫門開啟器，是專門用在轉盤上的嗎？

I feel like this needs the music from Thunderbirds.

我覺得這段需要雷鳥神劍的配樂。

So the whole idea of Catesby Tunnel is to create constant atmospheric conditions.

所以 Catesby Tunnel 的整個概念就是創造恆定的氣候條件。

We shut the doors at both ends and we've sealed the tunnel so that there's no wind coming through it.

我們會關閉兩端的門，並封閉隧道，確保沒有風會穿過它。

Because we're surrounded by earth actually means that the temperature within the tunnel is within one or two degrees.

因為我們被土壤環繞，這意味著隧道內的溫度變化只有一到兩度。

All year round we had the Aston Martin Valkyrie in the tunnel.

一整年我們都有 Aston Martin Valkyrie 在隧道裡進行測試。

We've had cyclists in here doing drafting, which is fairly, fairly unique, something that you can't do in other places.

我們讓自行車騎士在這裡進行跟車測試，這相當、相當獨特，是在其他地方做不到的。

One of the biggest issues is what happens if there's an accident in the tunnel and how do we get to them?

其中一個最大的問題是，如果隧道內發生意外，該如何處理？

So throughout every test we have a fire safety team on site.

所以在每次測試期間，我們都有消防安全團隊在現場待命。

They're there to respond if there is an accident.

他們會在發生意外時前往支援。

There is a very slight gradient to this tunnel and while I'm sure some of the marketing team would be very happy if it was perfectly flat, turns out there is a little bit of an advantage to that gradient because drag increases with the square of speed, but

這條隧道有非常微小的坡度，雖然我確定行銷團隊如果能完全平坦一定會很高興，但事實證明，這個坡度帶來了一點優勢，因為阻力會隨著速度的平方增加，但是

So if you have one test going very slightly downhill and one test going very slightly uphill, in theory, you can separate those two factors out from each other with a lot of maths that I do not understand.

所以，如果你有一個測試稍微下坡，另一個測試稍微上坡，理論上，你可以用很多我搞不懂的數學方法，把這兩個因素分開。

The Catesbury Tunnel surface is an asphalt surface, typical of an A road that you would see outside, but

Catesby Tunnel 的路面是瀝青路面，就像你在外面看到的 A 級道路一樣，但是

just finished to as high tolerance as we can get.

我們盡可能以最高的精度完成了它。

I do like how you stick to one side of the tunnel like it's a two way road.

我喜歡你都靠隧道的一側騎，好像這是雙向車道一樣。

It just seems wrong barrelling that fast down the centre of a road.

快速地衝在道路中間，感覺不太對。

And also for consistency, for the aerodynamic wake.

而且為了保持一致性，還有氣動尾流。

Different depending on where you are in the tunnel.

取決於你在隧道裡的哪個位置，會有所不同。

So I've been kept in the dark for about 20 minutes now while you wrangle data.

所以你整理數據的這二十分鐘，我都一直被蒙在鼓裡。

Well, this is an example of one of the coast down tests.

嗯，這是其中一次滑行測試的例子。

So that's us accelerating rapidly up to 130, then pop it into neutral and then coast down to about 50, 40 and then brake so you don't hit the barrels.

所以我們快速加速到 130，然後排入空檔，接著滑行到大約 50、40，然後煞車，這樣才不會撞到桶子。

So we had like four or five runs with a clean car.

我們有四、五次是乾淨的車子測試。

We had five, six runs with the GoPros in varying configurations.

我們有五、六次是裝著 GoPro，不同配置的測試。

So we've got some sort of drag from some sort of camera.

所以我們有某種來自某種攝影機的阻力。