Potpourri Page 10
Blimps, Dirigibles and other Airships
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from Wikipedia

An airship or dirigible balloon is a type of aerostat or lighter-than-air aircraft that can navigate through the air
under its own power.  Aerostats gain their lift from large gas bags filled with a lifting gas that is less dense than the
surrounding air.
In early dirigibles, the lifting gas used was hydrogen gas, due to its high lifting capacity and ready availability. Helium
gas has almost the same lifting capacity and is not flammable, unlike hydrogen, but is rare and relatively expensive.
Significant amounts were first discovered in the United States and for a while helium was only used for airships by
the United States.  Most airships built since the 1960s have used helium, though some have used hot air.
The envelope of an airship may form a single gas bag, or may contain a number of internal gas-filled cells. An airship
also has engines, crew, and optionally also payload accommodation, typically housed in one or more "gondolas"
suspended below the envelope.
The main types of airship are non-rigid, semi-rigid, and rigid.   Non-rigid airships, often called "blimps", rely on
internal pressure to maintain the shape of the airship. Semi-rigid airships maintain the envelope shape by internal
pressure, but have some form of supporting structure, such as a fixed keel, attached to it. Rigid airships have an
outer structural framework which maintains the shape and carries all structural loads, while the lifting gas is
contained in one or more internal gas bags or cells.   Rigid airships were first flown by Count Zeppelin and the vast
majority of rigid airships built were manufactured by the firm he founded. As a result, rigid airships are called
zeppelins.
Airships were the first aircraft capable of controlled powered flight, and were most commonly used before the 1940s,
but their use decreased over time as their capabilities were surpassed by those of aeroplanes. Their decline was
accelerated by a series of high-profile accidents, including the 1930 crash and burning of British R101 in France, the
1933 and 1935 storm-related crashes of the twin airborne aircraft carrier U.S. Navy helium-filled rigids, the USS
Akron and USS Macon respectively, and the 1937 burning of the hydrogen-filled Hindenburg. From the 1960s, helium
airships have been used in applications where the ability to hover in one place for an extended period outweighs the
need for speed and maneuverability such as advertising, tourism, camera platforms, geological surveys, and aerial
observation.
Pictures   Google images <click on thumbnails to enlarge>
Goodyear blimp


Coca Cola Blimp



Budweiser Blimp



Sun Trust Blimp



Outback Steakhouse Blimp




Met Life Blimp
    Blimps                                        Zeppelins
Hindenburg



Hindenburg Disaster



Hindenburg Disaster A Moment
In Radio History