Aircraft
Kite flying in China dates back several hundred years before the 3rd century BC. This ancient practice represents the earliest known example of man-made flight. Leonardo da Vinci created flying machine designs during the 15th century that incorporated aeronautical concepts. These early blueprints remained unworkable due to limitations in contemporary knowledge. The Montgolfier brothers invented the hot-air balloon in the late 18th century. Manned flights followed shortly after this invention. Hydrogen gas discovery led to the hydrogen balloon at almost the same time. Sir George Cayley developed modern aerodynamics through theories in mechanics and fluid dynamics. France established balloon companies during the French Revolution for military purposes. Experiments with gliders provided the basis for learning winged aircraft dynamics in the second half of the 19th century. Otto Lilienthal and Octave Chanute contributed significantly to these studies. Wilbur and Orville Wright successfully flew the first airplane in 1903 following their pioneering research. Charles Frederick Page received the first U.S. patent for an aircraft in 1906. The basic configuration with its characteristic cruciform tail was established by 1909.
Lighter-than-air aircraft or aerostats use buoyancy to float in the air much like ships on water. They are characterized by one or more large cells filled with lifting gases such as helium, hydrogen, or hot air. Small hot-air balloons called sky lanterns originated from ancient China prior to the 3rd century BC. Kites were also used in the military but rely on differences of air pressure beneath and above the kite. Heavier-than-air aircraft or aerodynes must find some way to obtain enough lift that can overcome the aircraft's weight. Aerodynamic lift involving wings is the most common method achieved via two methods. Fixed-wing aircraft achieve airflow past the wings by having the entire aircraft moving forward through the air. Rotorcraft do so by having mobile elongated wings spinning rapidly around a mast in an assembly known as the rotor. A rotary-wing aircraft uses rotors that spin around a vertical mast to generate lift. The International Civil Aviation Organization defines a rotorcraft as supported in flight by reactions of air on one or more rotors. Some types like 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.
Common examples of aircraft include airplanes drones rotorcraft including helicopters airships including blimps gliders paramotors and hot air balloons. Part 1 of Subchapter A of Chapter I of Title 14 of the U.S. Code of Federal Regulations states that aircraft means a device used or intended to be used for flight in the air. Military aircraft are any aircraft operated by a legal or insurrectionary armed service of any type. Combat aircraft are designed to destroy enemy equipment using its own armament. Non-combat aircraft such as transports and tankers may carry weapons for self-defense. Civil aviation represents all non-military and non-state aviation which can be both private and commercial. Commercial air transport includes scheduled and non-scheduled passenger and cargo flights. Aerial work involves specialized services such as agriculture photography surveying search and rescue etcetera. General aviation includes all other civil flights either private or commercial. In the United States general aviation carries 166 million passengers each year more than any individual airline. Scheduled air transport is larger in terms of passenger numbers while general aviation is larger in number of flights. Some countries make regulatory distinctions based on whether aircraft are flown for hire. Commercial aviation includes most flying done for hire particularly scheduled service on airlines. Private aviation includes pilots flying for their own purposes without receiving remuneration.
The key parts of an aircraft are generally divided into three categories: structure propulsion system and avionics. The structure comprises main load-bearing elements associated equipment and flight controls. The propulsion system if it exists comprises power source and associated equipment described above. Avionics comprise electrical and electronic control navigation communication systems including cockpit instrumentation radar monitoring and communications. Wings are usually constructed with wooden or metal inner framework and skin stretched over it. Rotorcraft use a rotor which acts like rotating wing allowing them to hover in place. When aerodynes carry payload it is usually carried inside fuselage central structure but can also be attached outside wing. Most aerodynes have rigid structure consisting of frame covered by skin since they travel at higher speeds than aerostats. Control surfaces adjust orientation about center of gravity when deflected generate moment rotates aircraft pitch roll yaw. Ailerons hinged surfaces normally located rear edge wing raise lower lift produced one side causing bank. Elevators usually located horizontal stabilizer increase decrease lift produced tail causing pitch up down. Rudder mounted vertical stabilizer deflects airflow tail left right controlling yaw. In rotorcraft control mainly accomplished through cyclical tilting rotor blades increasing angle attack one side decreasing other.
The largest aircraft by dimensions volume as of 2016 is the long British Airlander 10 hybrid blimp. It has helicopter fixed-wing features capable speeds up to airborne endurance two weeks payload up to. The largest aircraft by weight largest regular fixed-wing ever built was Antonov An-225 Mriya Soviet-built Ukrainian SSR six-engine transport 1980s. That aircraft was long with wingspan holding world payload record after transporting goods flown loads commercially. Maximum loaded weight was heaviest aircraft built to date could cruise at. Aircraft destroyed during Russo-Ukrainian War. Largest military airplanes include Ukrainian Antonov An-124 Ruslan world second-largest airplane American Lockheed C-5 Galaxy transport weighing loaded over. Hughes H-4 Hercules Spruce Goose American World War II wooden flying boat had greater wingspan 94m 260ft than any current aircraft. Fastest fixed-wing fastest glider Space Shuttle reentered atmosphere nearly Mach 25 or. Fastest recorded powered aircraft flight fastest recorded air-breathing powered aircraft NASA X-43A Pegasus scramjet-powered hypersonic lifting body experimental research aircraft Mach 9.68 or on the 16th of November 2004. Prior X-43A fastest recorded manned powered airplane North American X-15 rocket-powered airplane Mach 6.7 or 7,274 km/h 4,520 mph the 3rd of October 1967.
Aircraft engines produce gases noise particulates fossil fuel combustion raising environmental concerns global effects local air quality. Jet airliners contribute climate change emitting carbon dioxide best understood greenhouse gas nitrogen oxides contrails particulates less scientific understanding. Radiative forcing estimated 1.4 that of alone excluding induced cirrus cloud very low level scientific understanding. In 2018 global commercial operations generated 2.4% emissions. Jet airliners became more fuel efficient emissions per revenue ton-kilometer 1990 were 47% those 1990. Emissions averaged 88 grams per revenue passenger per km in 2018. Aviation industry more fuel efficient overall emissions risen volume air travel increased. By 2020 aviation emissions 70% higher than 2005 could grow 300% by 2050. Aircraft noise pollution disrupts sleep children education increase cardiovascular risk. Airports generate water pollution extensive handling jet fuel deicing chemicals contaminating nearby water bodies if not contained. Aviation activities emit ozone ultrafine particles health hazards. Piston engines general aviation burn Avgas releasing toxic lead. Aviation footprint reduced better fuel economy aircraft air traffic control flight routes optimized lower non-effects climate from particulates contrails. Aviation biofuel emissions trading carbon offsetting ICAO CORSIA lower emissions. Usage lowered short-haul flight bans train connections personal choices taxation subsidies. Fuel-powered aircraft replaced hybrid electric aircraft hydrogen-powered aircraft since 2021 IATA members plan net-zero carbon emissions 2050 followed ICAO 2022.
Common questions
When did kite flying in China begin?
Kite flying in China dates back several hundred years before the 3rd century BC. This ancient practice represents the earliest known example of man-made flight.
Who invented the hot-air balloon and when was it created?
The Montgolfier brothers invented the hot-air balloon in the late 18th century. Manned flights followed shortly after this invention.
What is the largest aircraft by dimensions as of 2016?
The largest aircraft by dimensions volume as of 2016 is the long British Airlander 10 hybrid blimp. It has helicopter fixed-wing features capable speeds up to airborne endurance two weeks payload up to.
Which aircraft holds the record for the fastest recorded powered aircraft flight on the 16th of November 2004?
The NASA X-43A Pegasus scramjet-powered hypersonic lifting body experimental research aircraft achieved Mach 9.68 or on the 16th of November 2004. Prior X-43A fastest recorded manned powered airplane North American X-15 rocket-powered airplane Mach 6.7 or 7,274 km/h 4,520 mph the 3rd of October 1967.
When did aviation emissions reach 70% higher than 2005 levels?
By 2020 aviation emissions were 70% higher than 2005 and could grow 300% by 2050. Aviation industry more fuel efficient overall emissions risen volume air travel increased.