Aeronave

Uma aeronave ( pl.: aeronave) é um veículo capaz de voar ganhando suporte do ar . Ela
neutraliza a força da gravidade usando sustentação estática ou a sustentação dinâmica de um
aerofólio , [ 1 ] ou, em alguns casos, impulso descendente direto de seus motores. Exemplos
comuns de aeronaves incluem aviões , aeronaves rotativas (incluindo helicópteros ), dirigíveis
(incluindo dirigíveis ), planadores , paramotores e balões de ar quente . [ 2 ] A Parte 1 [ 3 ]
(Definições e Abreviações) do Subcapítulo A do Capítulo I do Título 14 do Código de
Regulamentos Federais dos EUA afirma que aeronave "significa um dispositivo que é usado ou
destinado a ser usado para voo no ar."

O Cessna 172 Skyhawk é a aeronave mais

produzida da história.

Um helicóptero Eurocopter AS350 Écureuil

.

A atividade humana que envolve aeronaves é chamada de aviação . A ciência da aviação,

incluindo o projeto e a construção de aeronaves, é chamada de aeronáutica . Aeronaves
tripuladas são pilotadas por um piloto a bordo , enquanto veículos aéreos não tripulados podem
ser controlados remotamente ou autocontrolados por computadores de bordo . As aeronaves
podem ser classificadas por diferentes critérios, como tipo de sustentação, propulsão (se
houver), uso e outros.
História

Aviation in 19th century

The history of aviation spans over two millennia, from the earliest innovations like kites and
attempts at tower jumping to supersonic and hypersonic flight in powered, heavier-than-air jet
aircraft. Kite flying in China, dating back several hundred years BC, is considered the earliest
example of man-made flight.[4] In the 15th-century Leonardo da Vinci created flying machine
designs incorporating aeronautical concepts, but they were unworkable due to the limitations of
contemporary knowledge.[5]

In the late 18th century, the Montgolfier brothers invented the hot-air balloon which soon led to
manned flights. At almost the same time, the discovery of hydrogen gas led to the invention of
the hydrogen balloon.[6] Various theories in mechanics by physicists during the same period,
such as fluid dynamics and Newton's laws of motion, led to the development of modern
aerodynamics; most notably by Sir George Cayley. Balloons, both free-flying and tethered, began
to be used for military purposes from the end of the 18th century, with France establishing
balloon companies during the French Revolution.[7]

In the 19th century, especially the second half, experiments with gliders provided the basis for
learning the dynamics of winged aircraft; most notably by Cayley, Otto Lilienthal, and Octave
Chanute. By the early 20th century, advances in engine technology and aerodynamics made
controlled, powered, manned heavier-than-air flight possible for the first time. In 1903, following
their pioneering research and experiments with wing design and aircraft control, the Wright
brothers successfully incorporated all of the required elements to create and fly the first
aeroplane.[8] The basic configuration with its characteristic cruciform tail was established by
1909, followed by rapid design and performance improvements aided by the development of
more powerful engines.

The first vessels of the air were the rigid steerable balloons pioneered by Ferdinand von Zeppelin
that became synonymous with airships and dominated long-distance flight until the 1930s, when
large flying boats became popular for trans-oceanic routes. After World War II, the flying boats
were in turn replaced by airplanes operating from land, made far more capable first by improved
propeller engines, then by jet engines, which revolutionized both civilian air travel and military
aviation.

In the latter half of the 20th century, the development of digital electronics led to major advances
in flight instrumentation and "fly-by-wire" systems. The 21st century has seen the widespread use
of pilotless drones for military, commercial, and recreational purposes. With computerized
controls, inherently unstable aircraft designs, such as flying wings, have also become practical.

Métodos de elevação

Lighter-than-air

Lighter-than-air aircraft or aerostats use buoyancy to float in the air in much the same way that
ships float on the water. They are characterized by one or more large cells or canopies, filled with
a lifting gas such as helium, hydrogen or hot air, which is less dense than the surrounding air.
Other gases lighter than air also theoretically work, however, such gases also needs to be same
for human use (non-flammable, non-toxic).[9] Small hot-air balloons, called sky lanterns, were first
invented in ancient China prior to the 3rd century BC and used primarily in cultural celebrations,
although they also had military purposes.[10] They, along with kites, were two forms of unmanned
aircraft that originated from China.[11] Kites were also used in the military, but unlike sky lanterns,
their flight is caused by the differences of air pressure beneath and above the kite.[12]

Hot air balloons

 Airship USS Akron over Manhattan in the
1930s

A balloon was originally any aerostat, while the term airship was used for large, powered aircraft
designs — usually fixed-wing.[13][14][15][16][17][18] In 1919, Frederick Handley Page was reported as
referring to "ships of the air," with smaller passenger types as "Air yachts."[19] In the 1930s, large
intercontinental flying boats were also sometimes referred to as "ships of the air" or "flying-
ships".[20][21]

Heavier-than-air

Heavier-than-air aircraft or aerodynes are denser than air and thus must find some way to obtain
enough lift that can overcome the aircraft's weight. There are two ways to produce dynamic
upthrust — aerodynamic lift by having air flowing past an aerofoil (such dynamic interaction of
aerofoils with air is the origin of the term "aerodyne"), or powered lift in the form of reactional lift
from downward engine thrust.[22][23]

Aerodynamic lift involving wings is the most common, and can be achieved via two methods.
Fixed-wing aircraft (airplanes and gliders) achieve airflow past the wings by having the entire
aircraft moving forward through the air, while rotorcraft (helicopters and autogyros) do so by
having mobile, elongated wings spinning rapidly around a mast in an assembly known as the
rotor.[24][22]

Fixed-wing Aircraft

Gliders were one of the first forms of a fixed wing aircraft. They are a special type of aircraft that
doesn't require an engine.[25] The first person to successfully build a human-carrying glider was
George Cayley, who also was the first to discover the four major aerodynamic forces.[26] The first
powered aircraft (Airplane) was invented by Wilbur and Orville Wright.[27]

Rotorcraft

A rotary-wing aircraft, rotorwing aircraft or rotorcraft is a heavier-than-air aircraft with rotary wings
that spin around a vertical mast to generate lift. The assembly of several rotor blades mounted
on a single mast is referred to as a rotor. The International Civil Aviation Organization (ICAO)
defines a rotorcraft as "supported in flight by the reactions of the air on one or more rotors".[28]

Rotorcraft generally include aircraft where one or more rotors provide lift throughout the entire
flight, such as helicopters, gyroplanes, autogyros, and gyrodynes Compound rotorcraft augment
the rotor with additional thrust engines, propellers, or static lifting surfaces. Some types, such as
helicopters, are capable of vertical takeoff and landing. An aircraft which uses rotor lift for
vertical flight but changes to solely fixed-wing lift in horizontal flight is not a rotorcraft but a
convertiplane.

The Mil Mi-8 is the most produced

rotorcraft.

Other methods of lift

A lifting body is an aircraft which produces lift through the shape of its body, rather than its
wings or rotors, like conventional aircraft. Lifting bodies were first experimented by NASA in
the 1960s-70s, but the idea was already conceived in the 1950s.[29]

A powered lift aircraft is one which has the capability of vertical takeoff and landing. These
aircraft must transition from vertical to lateral movement, which is considered the most
dangerous phases of a flight.[30] Classes of powered lift types include VTOL jet aircraft (such
as the Harrier jump jet) and tiltrotors, such as the Bell Boeing V-22 Osprey, among others.[31][32]

An ornithopter is an aircraft that produces lift through the movement of its wings, akin to how
a bird flies.[33]

Extremos de tamanho e velocidade

Size

The largest aircraft by dimensions and volume (as of 2016) is the 302 ft (92 m) long British
Airlander 10, a hybrid blimp, with helicopter and fixed-wing features, and reportedly capable of
speeds up to 90 mph (140 km/h; 78 kn), and an airborne endurance of two weeks with a payload
of up to 22,050 lb (10,000 kg).[34][35][36]
The largest aircraft by weight and largest regular fixed-wing aircraft ever built, as of 2016, was
the Antonov An-225 Mriya. That Soviet-built (Ukrainian SSR) six-engine transport of the 1980s
was 84 m (276 ft) long, with an 88 m (289 ft) wingspan. It holds the world payload record, after
transporting 428,834 lb (194,516 kg) of goods, and has flown 100 t (220,000 lb) loads
commercially. With a maximum loaded weight of 550–700 t (1,210,000–1,540,000 lb), it was also
the heaviest aircraft built to date. It could cruise at 500 mph (800 km/h; 430 kn).[37][38][39][40][41]
The aircraft was destroyed during the Russo-Ukrainian War.[42]

The largest military airplanes are the Ukrainian Antonov An-124 Ruslan (world's second-largest
airplane, also used as a civilian transport),[43] and American Lockheed C-5 Galaxy transport,
weighing, loaded, over 380 t (840,000 lb).[41][44] The 8-engine, piston/propeller Hughes H-4
Hercules "Spruce Goose" — an American World War II wooden flying boat transport with a greater
wingspan (94m/260 ft) than any current aircraft and a tail height equal to the tallest (Airbus
A380-800 at 24.1m/78 ft) — flew only one short hop in the late 1940s and never flew out of
ground effect.[41]

The largest civilian airplanes, apart from the above-noted An-225 and An-124, are the Airbus
Beluga cargo transport derivative of the Airbus A300 jet airliner, the Boeing Dreamlifter cargo
transport derivative of the Boeing 747 jet airliner/transport (the 747-200B was, at its creation in
the 1960s, the heaviest aircraft ever built, with a maximum weight of over 400 t (880,000 lb)),[44]
and the double-decker Airbus A380 "super-jumbo" jet airliner (the world's largest passenger
airliner).[41][45]

Speeds

The fastest fixed-wing aircraft and fastest glider, is the Space Shuttle, which re-entered the
atmosphere at nearly Mach 25 or 17,500 mph (28,200 km/h)[46]

The fastest recorded powered aircraft flight and fastest recorded aircraft flight of an air-
breathing powered aircraft was of the NASA X-43A Pegasus, a scramjet-powered, hypersonic,
lifting body experimental research aircraft, at Mach 9.68 or 6,755 mph (10,870 km/h) on 16
November 2004.[47]

Prior to the X-43A, the fastest recorded powered airplane flight, and still the record for the fastest
manned powered airplane, was the North American X-15, rocket-powered airplane at Mach 6.7 or
7,274 km/h (4,520 mph) on 3 October 1967.[48]

The fastest manned, air-breathing powered airplane is the Lockheed SR-71 Blackbird, a U.S.
reconnaissance jet fixed-wing aircraft, having reached 3,530 km/h (2,193 mph) on 28 July
1976.[49]
Propulsão e direção

Unpowered aircraft

The main feature of unpowered aircraft is the inability to directly provide thrust through its
engines. This means that all unpowered aircraft rely on the environment for sustained flight.
Gliders, for example, take advantage of their aerodynamic properties to enable them to travel
long distances. Techniques such as thermal circling, where gliders fly into warm air which allows
them to rise, prolongs flight time.[50] Due to the lack of an engine, initial propulsion assistance is
usually necessary to ensure flight. A common glider launching method is aerotowing, where
another aircraft tows the glider to an altitude from which sustained flight is possible.[51] Steering
for a glider is also rudimentary, while more complex gliders like sailplanes usually have joysticks
for steering, more basic aircraft like hang gliders rely on the pilot's physical coordination to
change the centre of gravity.[52]

Sailplane (Rolladen-Schneider LS4)

Powered aircraft

A powered aircraft is an aircraft with a source of mechanical power, used to produce thrust. Such
sources are generally engines, as is the case with airplanes, but can be human-powered in more
extreme cases.[53][54]

Propeller aircraft

Propeller aircraft, as their name suggests, rely on propellers to produce thrust for the airplane.[55]
 A turboprop-engined DeHavilland Twin
Otter adapted as a floatplane

Jet aircraft

Lockheed Martin F-22A Raptor

Compared to engines using propellers, jet engines can provide much higher thrust, higher speeds
and, above about 40,000 ft (12,000 m), greater efficiency.[56]

Rotorcraft

Projeto e construção

The key parts of an aircraft are generally divided into three categories:

The structure ("airframe"[57][58][59][60]) comprises the main load-bearing elements and

associated equipment, as well as flight controls.

The propulsion system ("powerplant"[57][58][61]) (if it is powered) comprises the power source
and associated equipment, as described above.

The avionics comprise the electrical and electronic control, navigation and communication
systems.[57][58][60][62]
Structure

Aerostats

A modern aerostat used by the U.S.

Department of Homeland Security, the
Tethered Aerostat Radar System (TARS)

An aerostat or lighter-than-air aircraft relies on buoyancy to maintain flight. Aerostats include

unpowered balloons (free-flying or tethered) and powered airships. The relative density of an
aerostat as a whole is lower than that of the surrounding atmospheric air (hence the name
"lighter-than-air"). Its main component is one or more gas capsules made of lightweight skins,
containing a lifting gas (hot air, or any gas with lower density than air, typically hydrogen or
helium) that displaces a large volume of air to generate enough buoyancy to overcome its own
weight. Payload (passengers and cargo) can then be carried on attached components such as a
basket, a gondola, a cabin or various hardpoints.[63][64] With airships, which need to be able to fly
against wind, the lifting gas capsules are often protected by a more rigid outer envelope or an
airframe, with other gasbags such as ballonets to help modulate buoyancy.

Aerostats are so named because they use aerostatic buoyant force that does not require any
forward movement through the surrounding air mass, resulting in the inherent ability to levitate
and perform vertical takeoff and landing. This contrasts with the heavier-than-air aerodynes that
primarily use aerodynamic lift, which must have consistent airflow over an aerofoil (wing)
surface to stay airborne. The term has also been used in a narrower sense, to refer to the
statically tethered balloon in contrast to the free-flying airship.[65] This article uses the term in its
broader sense.
Aerodynes

Airframe diagram for an AgustaWestland

AW101 helicopter

Power

The source of motive power for an aircraft is normally called the powerplant, and includes engine
or motor, propeller or rotor, (if any), jet nozzles and thrust reversers (if any), and accessories
essential to the functioning of the engine or motor (e.g.: starter, ignition system, intake system,
exhaust system, fuel system, lubrication system, engine cooling system, and engine
controls).[57][58][61]

Powered aircraft are typically powered by internal combustion engines (piston[66] or turbine[67])
burning fossil fuels—typically gasoline (avgas) or jet fuel. A very few are powered by rocket
power, ramjet propulsion, or by electric motors, or by internal combustion engines of other types,
or using other fuels. A very few have been powered, for short flights, by human muscle energy
(e.g.: Gossamer Condor).[68][69][70]

Avionics

The avionics comprise any electronic aircraft flight control systems and related equipment,
including electronic cockpit instrumentation, navigation, radar, monitoring, and communications
systems.[57][58][60][62]

Características de voo

Flight envelope

The flight envelope of an aircraft refers to its approved design capabilities in terms of airspeed,
load factor and altitude.[71][72]
Range

The Boeing 777-200LR is one of the

longest-range airliners, capable of flights of
more than halfway around the world.

The maximal total range is the maximum distance an aircraft can fly between takeoff and
landing. Powered aircraft range is limited by the aviation fuel energy storage capacity (chemical
or electrical) considering both weight and volume limits.[73] Unpowered aircraft range depends
on factors such as cross-country speed and environmental conditions. The range can be seen as
the cross-country ground speed multiplied by the maximum time in the air. The fuel time limit for
powered aircraft is fixed by the available fuel (considering reserve fuel requirements) and rate of
consumption. The Airbus A350-900ULR is among the longest range airliners.[74]

Some aircraft can gain energy while airborne through the environment (e.g. collecting solar
energy or through rising air currents from mechanical or thermal lifting) or from in-flight
refueling. These aircraft could theoretically have an infinite range.

Ferry range means the maximum range that an aircraft engaged in ferry flying can achieve. This
usually means maximum fuel load, optionally with extra fuel tanks and minimum equipment. It
refers to the transport of aircraft without any passengers or cargo. Combat radius is a related
measure based on the maximum distance a warplane can travel from its base of operations,
accomplish some objective, and return to its original airfield with minimal reserves.

Flight dynamics

Flight dynamics
Flight dynamics is the science of air vehicle orientation and control in three dimensions. The
three critical flight dynamics parameters are the angles of rotation in three dimensions about the
vehicle's center of gravity (cg), known as pitch, roll and yaw. These are collectively known as
aircraft attitude, often principally relative to the atmospheric frame in normal flight, but also
relative to terrain during takeoff or landing, or when operating at low elevation. The concept of
attitude is not specific to fixed-wing aircraft, but also extends to rotary aircraft such as
helicopters, and dirigibles, where the flight dynamics involved in establishing and controlling
attitude are entirely different.

Control systems adjust the orientation of a vehicle about its cg. A control system includes
control surfaces which, when deflected, generate a moment (or couple from ailerons) about the
cg which rotates the aircraft in pitch, roll, and yaw. For example, a pitching moment comes from
a force applied at a distance forward or aft of the cg, causing the aircraft to pitch up or down.

A fixed-wing aircraft increases or decreases the lift generated by the wings when it pitches nose
up or down by increasing or decreasing the angle of attack (AOA). The roll angle is also known as
bank angle on a fixed-wing aircraft, which usually "banks" to change the horizontal direction of
flight. An aircraft is streamlined from nose to tail to reduce drag making it advantageous to keep
the sideslip angle near zero, though an aircraft may be deliberately "sideslipped" to increase drag
and descent rate during landing, to keep aircraft heading same as runway heading during cross-
wind landings and during flight with asymmetric power.[75]

Stability

The empennage of a Boeing 747-200

A fixed wing is typically unstable in pitch, roll, and yaw. Pitch and yaw stabilities of conventional
fixed wing designs require horizontal and vertical stabilisers,[76][77] which act similarly to the
feathers on an arrow.[78] These stabilizing surfaces allow equilibrium of aerodynamic forces and
to stabilise the flight dynamics of pitch and yaw.[76][77]

Control

Impacto ambiental
Aircraft engines produce gases, noise, and particulates from fossil fuel combustion, raising
environmental concerns over their global effects and on local air quality.[79]

Jet airliners contribute to climate change by emitting carbon dioxide (CO2), the best understood
greenhouse gas, and, with less scientific understanding, nitrogen oxides, contrails and
particulates. Their radiative forcing is estimated at 1.4 that of CO2 alone, excluding induced
cirrus cloud with a very low level of scientific understanding. In 2018, global commercial
operations generated 2.4% of CO2 emissions.[80] Jet airliners have become more fuel efficient
and CO2 emissions per revenue ton-kilometer (RTK) in 2018 were 47% of those in 1990. In 2018,
CO2 emissions averaged 88 grams of CO2 per revenue passenger per km. While the aviation
industry is more fuel efficient, overall emissions have risen as the volume of air travel has
increased. By 2020, aviation emissions were 70% higher than in 2005 and they could grow by
300% by 2050.[81]

Aircraft noise pollution disrupts sleep, children's education and could increase cardiovascular
risk. Airports can generate water pollution due to their extensive handling of jet fuel and deicing
chemicals if not contained, contaminating nearby water bodies. Aviation activities emit ozone
and ultrafine particles, both of which are health hazards. Piston engines used in general aviation
burn Avgas, releasing toxic lead.

Aviation's environmental footprint can be reduced by better fuel economy in aircraft, or air traffic
control and flight routes can be optimized to lower non-CO2 effects on climate from NOx,
particulates or contrails. Aviation biofuel, emissions trading and carbon offsetting, part of the
ICAO's CORSIA, can lower CO2 emissions. Aviation usage can be lowered by short-haul flight
bans, train connections, personal choices and aviation taxation and subsidies. Fuel-powered
aircraft may be replaced by hybrid electric aircraft and electric aircraft or by hydrogen-powered
aircraft. Since 2021, the IATA members plan net-zero carbon emissions by 2050, followed by the
ICAO in 2022.

Usos para aeronaves

Military

Boeing B-17E in flight

A military aircraft is any aircraft that is operated by a legal or insurrectionary armed service of
any type.[82] Military aircraft can be either combat or non-combat:

Combat aircraft are aircraft designed to destroy enemy equipment using its own armament.[82]
Combat aircraft are typically developed and procured only by military forces.

Non-combat aircraft, such as transports and tankers, are not designed for combat as their
primary function but may carry weapons for self-defense. These mainly operate in support
roles, and may be developed by either military forces or civilian organizations.

Civil

Agusta A109 helicopter of the Swiss air

rescue service

Civil aviation is one of two major categories of flying, representing all non-military and non-state
aviation, which can be both private and commercial. Most countries in the world are members of
the International Civil Aviation Organization and work together to establish common Standards
and Recommended Practices for civil aviation through that agency.

Civil aviation includes three major categories:

Commercial air transport, including scheduled and non-scheduled passenger and cargo flights

Aerial work, in which an aircraft is used for specialized services such as agriculture,
photography, surveying, search and rescue, etc.

General aviation (GA), including all other civil flights, private or commercial[83]

Although scheduled air transport is the larger operation in terms of passenger numbers, GA is
larger in the number of flights (and flight hours, in the U.S.[84]) In the U.S., GA carries 166 million
passengers each year,[85] more than any individual airline, though less than all the airlines
combined. Since 2004, the U.S. airlines combined have carried over 600 million passengers each
year, and in 2014, they carried a combined 662,819,232 passengers.[86]

Some countries also make a regulatory distinction based on whether aircraft are flown for hire,
like:

Commercial aviation includes most or all flying done for hire, particularly scheduled service on
airlines; and
 Private aviation includes pilots flying for their own purposes (recreation, business meetings,
etc.) without receiving any kind of remuneration.

A British Airways Boeing 747-400 departs

London Heathrow International Airport.
This is an example of a commercial
aviation service.

All scheduled air transport is commercial, but general aviation can be either commercial or
private. Normally, the pilot, aircraft, and operator must all be authorized to perform commercial
operations through separate commercial licensing, registration, and operation certificates.

Experimental

A model aircraft, weighing six grams

An experimental aircraft is an aircraft intended for testing new aerospace technologies and
design concepts.

The term research aircraft or testbed aircraft, by contrast, generally denotes aircraft modified to
perform scientific studies, such as weather research or geophysical surveying, similar to a
research vessel.[87]

The term "experimental aircraft" also has specific legal meaning in Australia, the United States
and some other countries; usually used to refer to aircraft flown with an experimental
certificate.[88] In the United States, this also includes most homebuilt aircraft, many of which are
based on conventional designs and hence are experimental only in name because of certain
restrictions in operation.[89]
Model

Veja também

Lists
Early flying machines

Flight altitude record

List of aircraft

List of civil aircraft

List of fighter aircraft

List of individual aircraft

List of large aircraft

List of aviation, aerospace and aeronautical terms

Topics
Aircraft hijacking

Aircraft spotting

Air traffic control

Airport

Flying car

Personal air vehicle

Powered parachute

Spacecraft

Spaceplane

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Links externos

History
The Evolution of Modern Aircraft (NASA) (https://www.hq.nasa.gov/office/pao/History/SP-46
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Virtual Museum (http://invention.psychology.msstate.edu/Tale_of_Airplane/taleplane.html)

Smithsonian Air and Space Museum (http://www.nasm.si.edu/) – online collection with a

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Information
Airliners.net (http://www.airliners.net/)

Aviation Dictionary (https://web.archive.org/web/20080624032037/http://www.aviationdiction

ary.org/) – free aviation terms, phrases and jargons

New Scientist 's aviation page (https://www.newscientist.com/topic/aviation)