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  • Posted By: bose_bose
  • Date Posted: 06/28/2011
  • Category: Technology
  • Words: 1772
  • Pages: 8
  • Views: 886
  • Rank: 763

Airships

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Airships

An airship is a type of lighter-than-air aircraft with propulsion and steering Systems, it is used to carry passengers and cargo. It obtains its buoyancy From the presence of a lighter-than-air gas such as hydrogen or helium. The First airship was developed by the French, called a ballon dirigible, it could Be steered and could also be flown against the wind.


TYPES OF AIRSHIP Two basic types of airship have been developed: the rigid airship, the shape of Which is fixed by its internal structure; and the nonrigid blimp, which depends On the pressure created by a series of air diaphragms inside its gas space to Maintain the shape of its fabric hull.


Inventors sought to combine the best Features of these models in a semirigid type, but it met with only limited Success. Today only the nonrigid airship is used. Rigid Airship The rigid airship’s structure resembled a cage that enclosed a series of Balloons called gas cells. These cells were tailored to fit the cylindrical Space and were secured in place by a netting that transmitted the lifting force Of their gas to the structure. Each gas cell had two or more valves, which Operated automatically to relieve pressure when the gas expanded with altitude, The valves could also be operated manually so that the pilot could release gas Whenever desired. Also on board was a ballast system that used water as ballast. On the ground This ballast served to make the airship heavier than air. When part of it was Released, the airship ascended to a cruising altitude where the engines supplied Propulsion, and further ballast could be released to gain more altitude. As fuel Was consumed, the airship became lighter and tended to climb. This was Countered in hydrogen-inflated airships by simply releasing gas into ...

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