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Aerospace Engineering

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment describing how engineers negotiate the natural factors that affect airplane flight.

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Wow, this is so neat. This must be an electronic classroom. 00:00:00
It certainly is. I'm Bob Starr. Have a seat. 00:00:05
We heard you could hook us up with any NASA researcher. 00:00:08
Yes, I can. In the electronic classroom, we use two-way audio-video communications over the phone lines. 00:00:11
I've been doing a little research, and I found that NASA's Dryden Flight Research Center in California 00:00:17
uses experimental planes to test out new futuristic ways of flight. 00:00:22
It tested NASA's first space shuttle before it went into space. 00:00:26
That sounds risky, too. That must be where they find out if the new designs are going to really work. 00:00:29
Hey, I know a researcher who's an expert in stability. His name is Al Bowers. Let me try to contact him. 00:00:35
Hi, I'm Al Bowers, an aerospace engineer at NASA's Dryden Flight Research Center. 00:00:48
I understand you have some questions about airplanes. 00:00:52
We have a lot of them. Could you tell us about weight, one of the four forces, and how it affects flight? 00:00:55
One way that weight affects an airplane is the way the weight is distributed. 00:01:00
The weight is distributed on an airplane so that there's a balance point, 00:01:04
and that balance point is called the center of gravity. 00:01:07
How does the center of gravity help you design planes? 00:01:10
I'm glad you asked, because we use the center of gravity to determine where to place the wings on an airplane. 00:01:14
On a normal airplane, like this one, we place the wings just behind the center of gravity, 00:01:20
and that helps to keep the front end of the airplane pointed forwards. 00:01:25
Our plane always flies to the right. Is there anything we can do to fix this problem? 00:01:28
That's the purpose of the tail. 00:01:32
The tail of the airplane keeps the nose from going up too high or dropping too low or slicing off to the left or right. 00:01:34
Here, let me show you. 00:01:40
This is an F-104 Starfighter aircraft. 00:01:43
It has the center of gravity just in front of the wings where the lift is produced, 00:01:46
and the tail is on the back end of the airplane. 00:01:50
All of that makes this a very stable aircraft. 00:01:53
Wow, what kind of plane is that next to you? I've never seen anything like that before. 00:01:56
Oh, this is the X-29. 00:02:01
I'm sure you noticed right away that the wings are on backwards, 00:02:04
and that we put the tail on the front of the airplane. 00:02:07
Backwards? And a tail on the front? 00:02:10
Yes, even backwards we can make it work with the tail on the front of the airplane, 00:02:13
just like on Burt Rutan's airplane. 00:02:17
How can it fly like that? 00:02:19
Let me show you with this broomstick. 00:02:21
This broomstick is like a traditional airplane where the center of gravity is in front of the wings, and it's stable. 00:02:24
If we move it to a new position, the broomstick just follows along. 00:02:30
But the X-29 was unstable. 00:02:34
The center of gravity was behind the wings, and so it was like your egg crate airplane. 00:02:36
And it didn't fly very well. 00:02:43
But on the X-29, we had advanced technology in the form of very fast computers. 00:02:45
Those computers could compensate for the instabilities in the airplane. 00:02:50
Let's go back to the broomstick for a second. 00:02:55
It's like your hand moving back and forth to compensate for the instability. 00:02:57
And that was the way we were able to make the X-29 fly. 00:03:02
Wow, I never thought a plane like that would have been able to fly. 00:03:05
I guess we need to find our center of gravity and make sure it's in front of our lift. 00:03:08
Yeah, that'll make our plane more stable. 00:03:13
Thanks for all your help, Mr. Bowers. Bye. 00:03:15
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
585
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 18″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
19.88 MBytes

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