Wednesday, October 04, 2006

Airport


Of of Airport One is an area with an infrastructure and the necessary services for the attendance of landings and take off of airplanes. A small airport is a lot of times referred by aterrisagem field (field of simply of or) or of of of aerodrome. It can also be referred as aerial basic, when the airport is designated a to serve military airplanes primarily.
Airports need to be of easy access a highways, for the passengers' transport, of of workers' load and they make airport a cities of another. For that end, some airports also possess access a ferrovias (load), subway and it transports in raft (passengers). Of of Of that Beyond, busy airports possess emergency teams as firemen quickly-helps of and, for an eventuality of an accident; they arrive of larger of airports a complete of hospitals of possessing.
Airports can occupy great spaces, times of for of arriving one of of more of occupying 30 thousand of of of acres; a great center aeroportuário can use directly more than 20 thousand of of of people, to move hundreds of airships, manejar hundreds of tons of aerial load and several dozens of thousands of passengers in an only day of operation As it was said previously, one of of of airport it is done to allow landing they do and take off of airships. Of of Such Para, an indispensable part in a healthy airport as landing of of of tracks take off of and, that need to be sufficiently long and wide for they allow landing operations that and take off of the largest airplanes using airport does. Of of Of that Beyond, as tracks need to be plane, with of or of without a possible of inclination of minimum.
In busy airports, as tracks they are generally done of asphalt or concert. Even so, fields of aterrisagem of small load in small cities and areas isolated, a lot of times possess its tracks done with earth, turfa of or of stones.
For the aid of the movements of airships in earth (after a landing or he/she pays take off of one of of, for of of of example), taxiways of as of they exist, tracks of aid that activate the traffic of airships any soil.
As heads of the tracks of aterrisagem of the airports need to be livers of any obstacles that can disturb or to put in risk an operation and pouso/decolagem of a given airship. A line of approach of airships, for of of of this, to be of precise towers of of liver buildings of and.

Toast of control they do of of airport Bristol, landing InglaterraPistas and take off should be built being taken into account the pattern of the winds of the area: the winds need to be parallel to the track in at least 95% time of they do, for a safety of a landing operation or take off, where lateral winds are never welcome; when of of of they happen, they create turbulence in the airship, a lot of increasing as probabilities of an accident. When one given area doesn't possess constant parallel winds to the landing track, a construction of a new track, angle of one of in first of the the perpendicular, of of having advised it is. Control of traffic aerial airports of In, as control towers organize that the movement of airships any they fly alone and any aerial space when these he/she/it approaches they make airport and they authorize operations of landing take off of and. Control towers locate in a location they make airport that allows wide vision they make airport as a whole, as well as wide vision of the airships that he/she/it approaches makes airport in a landing operation. Of of Emergency In a, they order that emergency teams make airport they are ready for a situation. Even so, it is necessary to observe that several aerodromes of small dimension and aterrisagem fields, as well as some airports of medium load, don't possess control tower or control of aerial traffic.
Use airports for of designated of they are the passengers' attendance that you/they use civil the airplane as means of transportation, for of of of load and aerial mail. A majority of the airports operates the three, but many assist mainly or passengers or carga/correio, circumstances of right of having given: Location (including a presence of another airports in the area) offered of Services: Size and quality of the pouso/decolagem track, quality of the terminals of fleeting e/ou load, etc) economic of Factors: it rates collected by the company aeroportuária a landings and parking of airships any airport, example of for.
The size of an airport and a variety of services for him offered it depends primarily on the amount of flights assisted by the airport and the movement of aerial traffic, it includes that the passengers' movement, load and aerial mail. Naturally, airports that move a great amount of passengers, with a contralto movement of airships, they tend a to occupy a larger surface.

Wednesday, September 27, 2006

Airplane


An airplane, or airplane, is a heavier airship than the air. An airship is an airplane when it possesses an or more fixed wings.
Two characteristics common to all the airplanes are the need of a constant flow of air for the wings for the sustentação of the airship, and the need of a plane area and free from obstacles where they can reach the necessary speed to take off and to raise flight, or to decrease it, in the case of a landing operation. Most of the airplanes, even so, he/she needs an airport having a good infrastructure to receive appropriate maintenance and replenishment, and for the tripulantes deslocação, load and passengers, when these come in reasonable number. While the great majority of the airplanes lands and it takes off in earth, some are capable to do the same in bodies of calm waters.
The airplane is now the faster civil and military means of transportation of the planet. Airplanes to commercial jet can reach up to 875 km/h, and to travel a room of the terrestrial sphere in subject of hours, and same small airplanes monomotores is capable to reach 175 km/h easily or more of cruzeiro speed. Already supersonic airplanes, that they operate now just for military ends, they can reach speeds that overcome in several times the speed of the sound. A hunt is a type of military airplane conceived for aerial combat (with other airplanes), in opposition to the bombardier, drawn to attack terrestrial objectives through bombs. You hunt them healthy relatively small, fast and very agile, and they were equipped more and more with armaments systems and persecution sophisticated to intercept and to attack other airplanes.
In the beginning, still before Second World War, they just existed two types of hunts: small, airplanes of only motor were used as interceptores and hunts of the day, for designated of pursuers times (hunters); and others of dual motor, of larger dimension, used as weighed hunts. The one of the first type proved to be not very practical, or perhaps have not been a very explored slope so that if they turned useful. They went becoming, like this, for a growing list of secondary papers, including stealthy hunts, of intervention, bombardiers and you hunt nocturnos, where the two motors got to support the necessary load for I carry out it of these papers. A torpedeiro is a bombardier drawn with the objectivo of attacking ships with torpedos, but could also carry conventional bombs. The reason for this airplane specifically servant is due to the need of the airplanes they need a longer fuselagem for they carry torpedos.
The torpedeiros was developed in the ends of First World War. During Second World War they were important in several battles, for example in the British attack in the battle of Taranto and in the Japanese attack Pearl Harbor. A helicopter Lynx with a torpedo mk46. To enlarge A helicopter Lynx with a torpedo mk46.
This airplane type almost disappeared imediamente after the end of the war, being substiduidos for other more common airplanes, and for its time for misseís. Since the fifties some helicopters began to be capable to throw torpedos, same being used for combat anti-submarine instead of aerial combat. Passing then be good it as defenses for frigates and aircraft carrier. The aeronautical turbines have the objective of generating enough empuxo to accelerate the airplane to an enough speed that by force of rising on the wings, equal or overcome his weight. The traction has the fundamental purpose of the aerodynamic resistance that acts on the airplane expiring. She is obtained thanks to third law of Newton: for each action a the same and contrary reaction fits. The air that enters in the turbine is accelerated and he/she leaves to a larger speed generating a force in having felt opposite, that " pushes " the airplane. That force is directly proportional to the vazão mássica of accelerated air, and the difference of speed of him between the entrance and the exit of the turbine.
The aeronautical turbines take borrowed the term turbine, although he is not the most appropriate. In fact, inside of an aeronautical motor, a cycle exists complete Brayton, what includes a compressor, a combustion camera and a turbine properly said. After the turbine it can still have a powder-burner and a convergent bocal, or convergent-divergente.
The air admitted in the turbine goes by the compressor in which suffers a temperature increase and pressure. This compressed air is admitted in a combustion camera, in the one which, its temperature increases still provoking a pressure increase quickly larger. In the exit of the combustion camera, the hot gases and the great pressure they are addressed for a turbine, usually of multiple apprenticeships and linked to the compressor by an axis. In her it leaves of the energy of the gases it is extracted to move the compressor. However the gases still go out with great temperature and way speed to impel the airplane. The turbines be classify in 4 different types: * Turbohélice: he/she has whole the mentioned parts less the bocal. In this case the turbine doesn't just have the purpose of generating potency to move the compressor, but also, of supplying the potency for the propeller (or helixes).
* Turbojatos: he/she has the basic configuration described above. Now its use is being reduced in favor of the turbofan, more efficient and silent. In the military versions it is common they be found models with powder-burners. . The objective of the powders burner is to increase the potency of the turbine in certain more critical situations. The beginning consists of to inject and to burn an additional amount of fuel in the discharge duto, after the turbine. That is possible, because there is still a great amount of oxygen in these escape gases. The great advantage is been to take advantage of part of the thermal energy of exit of the gases to vaporize and to do the ignition of the extra fuel. When the fuel is burned there is still an increase larger of the temperature of the gases and with that it happens its expansion. Once the area of the exit section doesn't increase, so that this larger volume of gases escape needs to accelerate for a larger speed. With this an extra empuxo is generated. However the powder-burners have little efficiency and they increase the consumption of fuel a lot. It is only used to supply an extra potency, that for normal road, it would only be obtained with the use of a larger turbine. For its reason alone acionamento he/she is justified in special situations as take off in short tracks and you maneuver of combat.
* Turbofans (without translation): he/she has the same configuration of the turbojato, more with the addition of a fan of great diameter that is in the entrance of the turbine. It leaves of the flow of air impelled by him it is going to the compressor and it leaves it passes on the outside of the carcass of the turbine. Its advantages are: improvement of the resfriamento, increase of the efficiency and noise reduction. This last factor is one of the reasons why the new turbofans they are much more silent than the old turbojatos. The air that passes on the outside, when mixing with the air of the exit of the turbine suppresses part of the noise. They can also be used in sub-sonic military airplanes.
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