Lighter than air flying devices
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Lighter-Than-Air Flying Devices. Background. Vehicles designed to travel through air are termed aircraft. There are two types of aircraft: 1. those that fly through the air 2. those that float in air. Hot air balloons and helium airships float in air.

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Lighter-Than-Air Flying Devices

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Lighter than air flying devices

Lighter-Than-Air Flying Devices


Background

Background

  • Vehicles designed to travel through air are termed aircraft.

  • There are two types of aircraft:

  • 1. those that fly through the air

  • 2. those that float in air.

  • Hot air balloons and helium airships float in air.

  • The density of these aircraft is less than the density of the air itself.

  • These aircraft which stay afloat by the buoyant force of air, are called lighter-than-air aircraft.


Lighter than air flying devices

  • Buoyancy is based on the idea that less dense objects will float in a more dense fluid.

  • A Styrofoam block, for example will float in water because the Styrofoam is less dense than water.

  • In the same way, a helium balloon will float in air because helium is less dense than air.


Lighter than air flying devices

  • Hot air balloons use propane tanks to heat the air in the envelope, or fabric part, of the balloon.

  • As this air is heated, it expands and becomes less dense than the surrounding air, allowing the balloon to rise off the ground and floats in the air.

  • Gas balloons are filled with a low-density gas.


Lighter than air flying devices

  • Hydrogen was used in the past in ships such as the Hindenburg.

  • However, hydrogen easily ignites and was found to be the cause of the tragic explosion of the Hindenburg.

  • Today helium is used in ships such as the Goodyear blimp.


Activity one

Activity One

  • What is this object called?

  • How does a hot air balloon move?

  • Does it fly through air or float in the air?

  • What do you think helps the balloon to float in the air?

  • What is the envelope, or fabric part, of the balloon filled with?

  • What do you know about hot air?


Lighter than air flying devices

  • Propane tanks are used to heat the air in the balloon.

  • When this air is heated, it expands and becomes less dense, or “lighter,” than the air around the balloon.

  • This allows the balloon to float.

  • Warm air expands and becomes less dense.


Lighter than air flying devices

  • Hang two paper bags upside down and have a light source placed beneath one bag.

  • Observe what happens.

  • What do you think will happen when the light is turned on?

  • Where will the heat come from?

  • Where will the heat go?

  • What do you think will happen to the bag?


Lighter than air flying devices

  • Test your predictions.

  • Describe on 2.3.3.

  • The air in the bag with the lamp under it will warm from the heat of the light bulb.

  • As it warms, the air expands, becoming less dense than the air surrounding it and the air in the other bag.

  • As a result, this end of the balance scale will rise as the bag begins to float.


Activity two

Activity two

  • What is this object called?

  • How does it move?

  • Does it fly through air or float in air?

  • What do you think helps the blimp to float in air?

  • What is the blimp filled with?

  • What do you know about helium?


Heliu m

Helium

  • Helium Balloon-Helium is less dense that air therefore it floats.

  • Lighter than air aircraft have special controls to manage their motion through air.

  • They are able to float at different altitudes depending on how the pilot controls the density of the aircraft.


Lighter than air flying devices

  • What would happen if I let go of the helium balloon?

  • How high do you think it would travel?

  • Will it move to the ceiling of the classroom?

  • Of we were outside, would it travel farther up in the sky?


Lighter than air flying devices

  • How could you control the balloon so that it did not float all the way to the ceiling?

  • Challenge- Experiment with the balloon to see if you can control it?

  • Activity sheet -2.3.4.


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