described collective pitch control for a helicopter, I described cyclic pitch

我描述了直升機的集體俯仰控制，我描述了週期性俯仰控制。

control for a helicoper, and I also described anti-torque pitch contol

直升機的控制，我還描述了反扭矩俯仰控制，我還描述了反扭矩俯仰控制。

But this week we're going to combine them all and describe something called collective-cyclic pitch mixing.

但本週我們'要把它們都結合起來，並描述一種叫做集體循環音調混合的東西。

It's pretty cool, and it's basically how every helicopter pilot flies,

它'很酷，基本上每個直升機飛行員都是這麼飛的。

including Carl in this case. The way I'm gonna describe this to you is by setting up

包括卡爾在這種情況下。我向你描述的方式是通過設置。

and showing you a high speed video clip of Carl flipping the helicopter over and flying inverted.

並給你看一段卡爾將直升機翻轉倒飛的高速視頻。

[rotor noise] You're about centre of the frame, maybe a little less right there.

你大概在車架的中心位置，也許就在那裡少一點。

[rotor noise]

[轉子噪音]

[rotor noise] That's gonna be good.

這將是不錯的。

It's pretty interesting, because if you think about it he's having

這是很有趣的，因為如果你想想看，他的有。

to use both collective and cyclic to make the sweep, go up, and then he's

使用集體和循環使掃，上去，然後他'的。

going back to negative collective.

回到消極的集體。

[music]

[音樂]

And then he's balancing

然後他在平衡

it up there with cyclic all the time. So you can see he's never using

它在那裡與循環所有的時間。所以你可以看到他從來沒有用過

one particular input. It's always a variation of both. OK so if you

一個特定的輸入。它'總是兩者的變化。好的，所以如果你

didn't really understand what was going on there, I asked Carl to do something else for us.

並沒有真正理解那裡發生的事情，我讓卡爾為我們做一些別的事情。

I asked him to mount a camera on the back of his helicopter looking at the swashplate, and then

我讓他在直升機後面裝一個攝像頭，看著斜盤，然後... ...

take a normal flight so you could see the collective-cyclic mixing, but here's a couple of things to

採取正常的飛行，所以你可以看到 集體循環混合，但這裡'是一對夫婦的事情，以

keep in mind. At the top of the screen you're going to see the rotors, and at some point it's gonna look like

牢記。在螢幕的頂部，你會看到轉子，並在某些時候，它'的會看起來像

the rotors are bending. That's actually not happening. What you're seeing there is

轉子是彎曲的。這實際上沒有發生。你所看到的是

something called the rolling shutter effect. The second thing you're gonna see it looks like the

稱為滾動快門效應的東西。第二件事，你'會看到它看起來像

rotor shaft is speeding up and slowing down wildly. That has to do with the frame rate of the camera.

轉子軸瘋狂加速和減速。這與相機的幀率有關。

That's called aliasing. If you want to know what aliasing is, just click this box over

這就叫別名。如果你想知道什麼是別名，只需點擊上方的這個框。

here and I'll explain that to you in greater detail.

在這裡，我'會給你更詳細的解釋。

[electronic servo sounds]

[電子伺服聲]

[music]

[音樂]

[music]

[音樂]

OK I've been getting a lot of comments on these videos about whether or not an actual

好吧，我'已經得到了很多的評論，這些視頻是否實際的。

helicopter can do these types of manouvres. And the answer is yes, and no.

直升機可以做這些類型的動作。 答案是可以，也可以不可以。

Helicopters can do this if they're designed for it, however you're limited by

直升機可以做到這一點，如果他們'的設計，然而你'的限制，由

the meat servo sitting in the seat. A human can only take so much accelleration.

坐在座位上的肉類伺服。一個人只能承受這麼多的加速度。

So how do you scale up what you're seeing on this RC helicopter to a real

那麼，如何將你在遙控直升機上看到的東西放大到真正的直升機上呢？

helicopter? Before they flew a space shuttle into space they had to do a wind tunnel test

直升機？在他們駕駛航天飛機進入太空之前，他們必須做一個風洞測試。

on it somehow right? Well it gets complicated but there's a term called similitude

某種程度上是吧？好吧，它變得複雜，但有一個術語，稱為比喻。

and similitude has to do with the geometric

和比喻與幾何學有關。

kinematic and the dynamic similarity between a small scale object and a

運動學和動態學上的相似性，小尺度的物體和小尺度的物體之間的相似性

full scale object. Engineers do this all the time, especially aerospace engineers.

全比例物體。工程師經常這樣做，尤其是航空航天工程師。

So anyway, go look at the wiki link I'm gonna put below and read up on similitude

所以，無論如何，去看看我'要把下面的維基鏈接，並閱讀了對比喻

so you can understand it. I will tell you this. It has something to do with continuum mechanics

所以你可以理解它。我會告訴你這個。它與連續體力學有關。

which is by far the hardest course I've ever taken in my life. So if you must know

這是到目前為止我一生中最難的課程''ve採取。所以如果你一定要知道

there's a city in Florida named Destin, and the thrift store there is the coolest place

有一個城市在佛羅里達州命名為Destin， 和舊貨店那裡是最酷的地方

on earth for me personally. Anyway next week's video will blow your mind.

在地球上對我個人來說。總之下週'的視頻會讓你大吃一驚。

It's really complicated but it's really interesting, so

這真的很複雜，但它真的很有趣，所以。

if you can understand it you're doing pretty good, but it blew my mind.

如果你能理解它，你'做得很好，但它讓我大吃一驚。

It's gonna blow yours too. Have a good one, and get Smarter Every Day.

它'的會吹你的太。 有一個好的，並得到更聰明的每一天。

[ Captions by Andrew Jackson ]

[安德魯-傑克遜的字幕]

Captioning in different languages welcome. Please contact Destin if you can help.

歡迎使用不同語言的字幕。如果你能幫忙，請聯繫Destin。