AIRSHIPS
An airship, also known as a dirigible, is a powered lighter-than-air
craft. In other words, an airship is an aircraft that derives its
lift from a lifting gas (usually helium or hot air) while it is
propelled forward by an engine. A lighter-than-air craft is
any vehicle that flies because it is lighter than air. This includes balloons and airships, also known as dirigibles. What makes a vehicle lighter than
air, is the fact that it uses a lifting gas (i.e. helium or hot
air) in order to be lighter than the surrounding air.
The difference between airships and balloons are the following:
Balloons simply follow the direction of the winds. In contrast,
airships are powered and have some means of controlling their
direction, usually with rudders.
There are four categories of airships, Rigid, Semi-Rigid, Non-Rigid
and Hot Air Airships. Rigid airships have an internal frame. Zeppelins are a good example of rigid airships.
See the post on Airships in my aerophilately blogpages from my collection:
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