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(aerospace engineering)
Any aircraft that derives its buoyancy or lift from a lighter-than-air gas contained within its envelope or one of its compartments; for example, ships and balloons.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



an aircraft that is lighter than air. The lifting force of an aerostat is produced by a gas that is less dense than air—hydrogen or helium—contained in a casing, in conformity with Archimedes’ principle. A distinction is made between controlled (dirigible), noncontrolled or free-flight (with a spherical casing—spherical aerostats or balloons and stratostats), and captive (kite) aerostats. Variation in the flight altitude of a free aerostat is realized in the following manner: lift is achieved by reducing the mass of the aerostat by discarding part of the ballast (usually bags of sand); descent is accomplished by decreasing the lifting force through the release of part of the gas through a valve. The lift and descent of a captive aerostat are accomplished with a winch.

Free aerostats are used chiefly for sporting and research purposes. Radiosondes, rescue aerostats, pilot balloons, jumper halloons, stratostats, and automatic aerostats with telemetric, meteorological, and other equipment are examples of free aerostats. Automatic aerostats are used to investigate jet streams and the formation of cyclones, for photographing the earth’s surface, in the determination of the effect of cosmic radiation in the lower layers of the stratosphere on living organisms, and also as starting platforms for the launching of meteorological rockets and as a means of elevating telescopes. Captive aerostats are used for meteorological purposes (probing of the atmosphere), in the hauling of timber in mountainous regions that are otherwise inaccessible, and so on.

Barrage aerostats are used in military work for antiaircraft defense of military, industrial, and other objectives. When air attack threatens, the aerostats ascend into the air in specific combat arrangements (“winches in a line,” “winches in two lines,” “winches over an area”). Their action is calculated for the destruction or damage of enemy airplanes by collision with cables, aerostat casings, or explosive charges suspended on the cables. During the Great Patriotic War, barrage aerostats of 100–400 cu m in volume were successfully used in the antiaircraft defense systems of Moscow, Leningrad, and other cities. Single barrage aerostats ascended to an altitude of up to 2,500 m, double ones (two aerostats on one cable) up to 4,500 m. Observation aerostats are employed to observe the field of battle and to correct the firing of artillery. They have a suspended gondola for the crew and are equipped with a telephone connection to the ground. The volume of observation aerostats is 400–1,000 cu m and higher.


Polozov, N. P., and M. A. Sorokin. Vozdukhoplavanie. Moscow, 1940.
Stobrovskii, N. G. Nasha strana—rodina vozdukhoplavaniia. Moscow, 1954.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


aerostatclick for a larger image
A lighter-than-air craft that can be either a balloon or an airship. It normally refers to the former. It is buoyant in atmosphere up to a height at which it displaces air equal to its mass. It is normally tethered and carries a payload consisting of radar, communications, or other observation devices.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Levitan, "Nonlinear aerostatic stability analysis of new suspension bridges with multiple main spans," Journal of the Brazilian Society of Mechanical Sciences & Engineering, vol.
All of this has been driven by the growing concern amongst governments, organisations and Individuals over the consumption of natural resources, which, states HAV, "naturally leads to aerostatic (lighter than air) principles to reduce both the energy cost and the financial operating cost of some of our transport requirements".
The Stiletto has an M-shaped hull that combines features from aerostatic, hydrostatic and hydrodynamic boat designs in order to effectively transition from low to high speed and increase the stability of the boat, he said.
From aerodynamic and aerostatic points of view, the side mirrors in car are known as adverse effects producing.
Yao, "Aerostatic and aerodynamic performance of an out-pump spirally grooved thrust bearing: analysis and comparisons to static load experiments," Tribology Transactions, vol.
Nitrogen (minimum -50[degrees]C) is used to ensure the carbon rings have sufficient sliding capability for the aerostatic barrier seal to achieve liftoff from the compressor shaft after stoppages.
Aerostatic ball bearings the flow field numerical calculation, the gas film thickness of the thin (micron) and thickness and circumference size difference of thousands of times.
The basis of such system consists of a massive small-grain grey granite brick with aerostatic rotational mechanism mounted on it through a suspension ring.
Since 2008 the company has been testing, protecting and preparing its technology to commercially launch an aerostatic collector to harness atmospheric electricity and convert atmospheric electricity into usable power.
Lieutenant Jean Baptiste Marie Meusnier is regarded as the father of the airship - in 1783, he presented a paper to the French Academy on "aerostatic machines".
In contrast to aerostatic air bearings, which operate on a compressed air supply, the KU Leuven air bearing was aerodynamic (or self-acting) and thus developed sufficient bearing pressure from its own rotation.