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Lighter than air aircraft (known as "aerostats") use buoyancy to float in the air in much the same way that ships float on the water. They typically have one or more large balloons or bags, filled with a relatively low density gas such as helium, hydrogen or hot air, which is less dense than the surrounding air.
Examples of lighter-than-air aircraft include non-steerable balloons, such as hot air balloons and gas balloons, and steerable airships (sometimes called dirigible balloons) such as blimps (that have non-rigid construction) and rigid airships that have an internal frame.


Heavier-than-air aircraft (known as "aerodynes") must find some way to push air or gas downwards, so that a reaction occurs (by Newton's laws of motion) to push the aircraft upwards. The most common way to do this is by propelling the craft forwards (typically via an engine) and using a wing to displace the air so that there is greater air pressure below the wing than above it. This is the principle behind all modern aircraft. The other way of achieving lift is known as "engine lift", which is to vertically fire an engine downwards so as to push the craft upwards, which is how rockets and missiles operate.In heavier-than-air aircraft, there are two ways to produce lift aerodynamic lift and engine lift

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Anonymous said...

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