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Flight Materials
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NASA Sci Files segment demonstrating NASA's use of smart materials to design the next generation of aircraft.
What are you doing?
00:00:00
I'm just looking at some of our new lightweight materials.
00:00:02
We need to learn about weight.
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Well you just learned that thrust is opposite to drag, and lift is what makes the airplane
00:00:07
go up, and weight pulls it back down in a pull of gravity.
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Yes, we just learned about that.
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Well in order for the airplane to fly, the lift force has to be greater than the weight
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of the airplane.
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And the lighter the airplane is, the easier it's going to be to lift the airplane.
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So for the same size wings, a lighter airplane is going to have less weight.
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That's exactly right.
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But there's another benefit of having a lighter airplane also.
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There is?
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Sure.
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For the same amount of force, or thrust, the lighter airplane will actually go farther.
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As an example, let's say you're pushing two kids on a swing.
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Who's going to go farther, the kid that's lighter or the kid that's heavier?
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The lighter kid will go farther.
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That's exactly right.
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So for the same amount of engine or thrust force, a lighter airplane is actually going
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to fly farther.
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Aeronautical engineers say that the airplane has greater range or maximum flight distance.
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Cool.
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Yeah, and lighter airplanes actually use less fuel too, so they're better for the environment
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as well.
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What research do you do here to make planes lighter?
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Well, we're trying to figure out how to make the materials that airplanes are made out
00:01:11
of a whole lot lighter.
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You see, today, most airplanes are made out of metal, like this piece right here.
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It's really strong, but it's also really heavy.
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Man, that is heavy.
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Yeah, it sure is.
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Well, we're researching something brand new.
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It's called composite materials.
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Composite materials are really strong, but they're also really lightweight.
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Here's a really big piece of composites right back here.
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Can you help me with this piece?
00:01:38
I don't know if I can help.
00:01:39
It looks kind of heavy.
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I might not be able to lift it.
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Give it a try.
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Wow, that's really light.
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Sure is.
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Composite materials are already being used in a lot of military airplanes because they're
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really lightweight, but they're also strong.
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We're also looking at another kind of material that's really interesting.
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It actually bends and twists when activated, or it can pop up and down when activated,
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too.
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What's that?
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They're called smart materials.
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Smart material?
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I'm a smart material.
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Yes, you are.
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This is an example of a smart material.
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This is called nitinol, and when you bend or twist it, it'll actually go back to being
00:01:56
completely flat when you heat it up.
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If you want to try it out, you can go to our website.
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We have a whole bunch of materials that you can try out.
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You can try it out.
00:02:00
You can try it out.
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You can try it out.
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You can try it out.
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You can try it out.
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completely flat when you heat it up.
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If you want to try bending it up, then I'll heat it up, and I'll show you how it works.
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There you go.
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That's great.
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Now when we heat it up, it goes back to being completely flat, as you can see.
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Wow.
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That's cool.
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How is that going to help an airplane?
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Well, you can take this material and put it in the wings of an airplane and make the airplane
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wings bend or twist.
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Or even simulate little pop-up feathers like what birds use to fly.
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Why would you want smart materials to mimic a bird's flight?
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That's a good question.
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Well, for their size, birds are really good flyers.
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And we're hoping that if some of our smaller airplanes can fly more like birds and bend
00:02:48
or twist their wings and fly to adjust for the different flight conditions while they're
00:02:53
flying along, they can actually be much better flyers.
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I don't think we can buy smart materials, but maybe we can make our A-car and lighter.
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Maybe we should use a phone car.
00:03:06
Yes.
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Now we need to test it.
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Or experiment.
00:03:09
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- Idioma/s:
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- NASA LaRC Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 510
- Fecha:
- 28 de mayo de 2007 - 15:32
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 03′ 11″
- 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:
- 19.11 MBytes