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127-438: Aviation includes the activities surrounding mechanical flight and the aircraft industry. Aircraft includes fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air aircraft such as hot air balloons and airships . Aviation began in the 18th century with the development of the hot air balloon , an apparatus capable of atmospheric displacement through buoyancy . Some of

254-765: A 2016 terrorist attack linked to ISIL , a truck was deliberately driven into a Christmas market next to the Kaiser Wilhelm Memorial Church , leaving 13 people dead and 55 others injured. In 2018, more than 200,000 protestors took to the streets in Berlin with demonstrations of solidarity against racism, in response to the emergence of far-right politics in Germany . Berlin Brandenburg Airport (BER) opened in 2020, nine years later than planned, with Terminal 1 coming into service at

381-402: A buoyant force that does not require lateral movement through the surrounding air mass to effect a lifting force. By contrast, aerodynes primarily use aerodynamic lift , which requires the lateral movement of at least some part of the aircraft through the surrounding air mass. Some things that fly do not generate propulsive thrust through the air, for example, the flying squirrel . This

508-455: A rocket launch , which provides the initial thrust to overcome the force of gravity and propels the spacecraft from the surface of the Earth. Once in space, the motion of a spacecraft—both when unpropelled and when under propulsion—is covered by the area of study called astrodynamics . Some spacecraft remain in space indefinitely, some disintegrate during atmospheric reentry , and others reach

635-501: A Slavic-derived name: Pankow , Steglitz-Zehlendorf , Marzahn-Hellersdorf , Treptow-Köpenick , and Spandau . Of Berlin's ninety-six neighborhoods, twenty-two bear a Slavic-derived name: Altglienicke , Alt-Treptow , Britz , Buch , Buckow , Gatow , Karow , Kladow , Köpenick , Lankwitz , Lübars , Malchow , Marzahn , Pankow , Prenzlauer Berg , Rudow , Schmöckwitz , Spandau , Stadtrandsiedlung Malchow , Steglitz , Tegel and Zehlendorf . The earliest human settlements in

762-583: A busy terminal area or using a major airport), and in many areas, such as northern Canada and low altitude in northern Scotland, air traffic control services are not available even for IFR flights at lower altitudes. Like all activities involving combustion , operating powered aircraft (from airliners to hot air balloons) releases soot and other pollutants into the atmosphere. Greenhouse gases such as carbon dioxide (CO 2 ) are also produced. In addition, there are environmental impacts specific to aviation: for instance, Another environmental impact of aviation

889-481: A camp for Sinti and Romani people (see Romani Holocaust ), and the Stalag III-D prisoner-of-war camp for Allied POWs of various nationalities. During World War II, large parts of Berlin were destroyed during 1943–45 Allied air raids and the 1945 Battle of Berlin . The Allies dropped 67,607 tons of bombs on the city, destroying 6,427 acres of the built-up area. Around 125,000 civilians were killed. After

1016-691: A center of the Enlightenment , but also, was briefly occupied during the Seven Years' War by the Russian army. Following France's victory in the War of the Fourth Coalition , Napoleon Bonaparte marched into Berlin in 1806 , but granted self-government to the city. In 1815, the city became part of the new Province of Brandenburg . The Industrial Revolution transformed Berlin during

1143-782: A city district separate from Brandenburg. In the early 20th century, Berlin had become a fertile ground for the German Expressionist movement. In fields such as architecture, painting and cinema new forms of artistic styles were invented. At the end of the First World War in 1918, a republic was proclaimed by Philipp Scheidemann at the Reichstag building . In 1920, the Greater Berlin Act incorporated dozens of suburban cities, villages, and estates around Berlin into an expanded city. The act increased

1270-503: A civil aviation authority must approve an aircraft suitable for safe flight operations. MRO firms are responsible for this process, thoroughly checking and documenting all components' repairs while tracking mechanical, propulsion, and electronic parts. Aviation regulators oversee maintenance practices in the country of aircraft registration, manufacture, or current location. All aircraft maintenance activities must adhere to international regulations that mandate standards. An aviation accident

1397-517: A combined state of Berlin and Brandenburg is different from other state fusion proposals. Normally, Article 29 of the Basic Law stipulates that a state fusion requires a federal law. However, a clause added to the Basic Law in 1994, Article 118a, allows Berlin and Brandenburg to unify without federal approval, requiring a referendum and a ratification by both state parliaments. In 1996, there

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1524-454: A feat made possible by their invention of three-axis control and in-house development of an engine with a sufficient power-to-weight ratio . Only a decade later, at the start of World War I , heavier-than-air powered aircraft had become practical for reconnaissance, artillery spotting, and even attacks against ground positions. Aircraft began to transport people and cargo as designs grew larger and more reliable. The Wright brothers took aloft

1651-524: A few hundred miles, was diminishing as airplane design advanced. The "Golden Age" of the airships ended on May 6, 1937. That year the Hindenburg caught fire, killing 36 people. The cause of the Hindenburg accident was initially blamed on the use of hydrogen instead of helium as the lift gas. An internal investigation by the manufacturer revealed that the coating used in the material covering the frame

1778-642: A flying fish was 45 seconds. Most birds fly ( see bird flight ), with some exceptions. The largest birds, the ostrich and the emu , are earthbound flightless birds , as were the now-extinct dodos and the Phorusrhacids , which were the dominant predators of South America in the Cenozoic era. The non-flying penguins have wings adapted for use under water and use the same wing movements for swimming that most other birds use for flight. Most small flightless birds are native to small islands, and lead

1905-427: A heavier aircraft gliding at a higher airspeed will arrive at the same touchdown point in a shorter time. Air pressure acting up against an object in air is greater than the pressure above pushing down. The buoyancy, in both cases, is equal to the weight of fluid displaced - Archimedes' principle holds for air just as it does for water. A cubic meter of air at ordinary atmospheric pressure and room temperature has

2032-564: A lifestyle where flight would offer little advantage. Among living animals that fly, the wandering albatross has the greatest wingspan, up to 3.5 meters (11 feet); the great bustard has the greatest weight, topping at 21 kilograms (46 pounds). Most species of insects can fly as adults. Insect flight makes use of either of two basic aerodynamic models: creating a leading edge vortex, found in most insects, and using clap and fling , found in very small insects such as thrips . Many species of spiders , spider mites and lepidoptera use

2159-411: A mass of about 1.2 kilograms, so its weight is about 12 newtons . Therefore, any 1-cubic-meter object in air is buoyed up with a force of 12 newtons. If the mass of the 1-cubic-meter object is greater than 1.2 kilograms (so that its weight is greater than 12 newtons), it falls to the ground when released. If an object of this size has a mass less than 1.2 kilograms, it rises in the air. Any object that has

2286-605: A mass that is less than the mass of an equal volume of air will rise in air - in other words, any object less dense than air will rise. Thrust-to-weight ratio is, as its name suggests, the ratio of instantaneous thrust to weight (where weight means weight at the Earth 's standard acceleration g 0 {\displaystyle g_{0}} ). It is a dimensionless parameter characteristic of rockets and other jet engines and of vehicles propelled by such engines (typically space launch vehicles and jet aircraft ). If

2413-417: A microclimate, with heat stored by the city's buildings and pavement . Temperatures can be 4 °C (7 °F) higher in the city than in the surrounding areas. Annual precipitation is 570 millimeters (22 in) with moderate rainfall throughout the year. Snowfall mainly occurs from December through March. The hottest month in Berlin was July 1834, with a mean temperature of 23.0 °C (73.4 °F) and

2540-424: A monumental ensemble. The National Socialist regime embarked on monumental construction projects in Berlin as a way to express their power and authority through architecture . Adolf Hitler and Albert Speer developed architectural concepts for the conversion of the city into World Capital Germania ; these were never implemented. NSDAP rule diminished Berlin's Jewish community from 160,000 (one-third of all Jews in

2667-470: A pair of flat gliding surfaces. "Flying" snakes also use mobile ribs to flatten their body into an aerodynamic shape, with a back and forth motion much the same as they use on the ground. Flying fish can glide using enlarged wing-like fins, and have been observed soaring for hundreds of meters. It is thought that this ability was chosen by natural selection because it was an effective means of escape from underwater predators. The longest recorded flight of

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2794-539: A planetary or lunar surface for landing or impact. In 2018, researchers at Massachusetts Institute of Technology (MIT) managed to fly an aeroplane with no moving parts, powered by an " ionic wind" also known as electroaerodynamic thrust. Many human cultures have built devices that fly, from the earliest projectiles such as stones and spears, the boomerang in Australia , the hot air Kongming lantern , and kites . George Cayley studied flight scientifically in

2921-540: A rapid population increase in Berlin. 1920s Berlin was the third-largest city in the world by population. After World War II and following Berlin's occupation, the city was split into West Berlin and East Berlin , divided by the Berlin Wall . East Berlin was declared the capital of East Germany, while Bonn became the West German capital. Following German reunification in 1990, Berlin once again became

3048-632: A reality in the 20th century following theoretical and practical breakthroughs by Konstantin Tsiolkovsky and Robert H. Goddard . The first orbital spaceflight was in 1957, and Yuri Gagarin was carried aboard the first crewed orbital spaceflight in 1961. There are different approaches to flight. If an object has a lower density than air, then it is buoyant and is able to float in the air without expending energy. A heavier than air craft, known as an aerodyne , includes flighted animals and insects, fixed-wing aircraft and rotorcraft . Because

3175-458: A retarding force called drag. Because lift and drag are both aerodynamic forces, the ratio of lift to drag is an indication of the aerodynamic efficiency of the airplane. The lift to drag ratio is the L/D ratio, pronounced "L over D ratio." An airplane has a high L/D ratio if it produces a large amount of lift or a small amount of drag. The lift/drag ratio is determined by dividing the lift coefficient by

3302-413: A small margin, largely based on support in former West Berlin , Brandenburg voters disapproved of the fusion by a large margin. It failed largely due to Brandenburg voters not wanting to take on Berlin's large and growing public debt and fearing losing identity and influence to the capital. Berlin is in northeastern Germany, in an area of low-lying marshy woodlands with a mainly flat topography , part of

3429-465: A technique called ballooning to ride air currents such as thermals , by exposing their gossamer threads which gets lifted by wind and atmospheric electric fields . Mechanical flight is the use of a machine to fly. These machines include aircraft such as airplanes , gliders , helicopters , autogyros , airships , balloons , ornithopters as well as spacecraft . Gliders are capable of unpowered flight. Another form of mechanical flight

3556-472: Is Germany 's capital and largest city by area and by population . With over 3.85 million inhabitants, it has more population within in its city limits than any other city in the European Union . The city is also one of the states of Germany , and is the third smallest state in the country in terms of area. Berlin is surrounded by the state of Brandenburg , and Brandenburg's capital Potsdam

3683-813: Is noise pollution , mainly caused by aircraft taking off and landing. Sonic booms were a problem with supersonic aircraft such as the Concorde . [REDACTED]  This article incorporates text by Wirths, Oliver; Tóth,Zsófia; Diaz Ruiz, Carlos available under the CC BY 4.0 license. Flight Many things can fly, from animal aviators such as birds , bats and insects , to natural gliders/parachuters such as patagial animals, anemochorous seeds and ballistospores , to human inventions like aircraft ( airplanes , helicopters , airships , balloons , etc.) and rockets which may propel spacecraft and spaceplanes . The engineering aspects of flight are

3810-418: Is perpendicular to the flow direction. Aerodynamic lift results when the wing causes the surrounding air to be deflected - the air then causes a force on the wing in the opposite direction, in accordance with Newton's third law of motion . Lift is commonly associated with the wing of an aircraft , although lift is also generated by rotors on rotorcraft (which are effectively rotating wings, performing

3937-508: Is a firm that ensures airworthiness or air transport. According to a 2024 article, "maintenance (M) involves inspecting, cleaning, oiling, and changing aircraft parts after a certain number of flight hours. Repair (R) is restoring the original function of parts and components. Overhaul (O) refers to extensive maintenance, the complete refurbishment of the aircraft, and upgrades in avionics, which can take several weeks to complete." Airlines are legally obligated to certify airworthiness, meaning that

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4064-439: Is a system that remains aloft primarily through the use of buoyancy to give an aircraft the same overall density as air. Aerostats include free balloons , airships , and moored balloons . An aerostat's main structural component is its envelope , a lightweight skin that encloses a volume of lifting gas to provide buoyancy , to which other components are attached. Aerostats are so named because they use "aerostatic" lift,

4191-468: Is an iconic landmark of Berlin and Germany; it stands as a symbol of eventful European history and of unity and peace. The Reichstag building is the traditional seat of the German Parliament. It was remodeled by British architect Norman Foster in the 1990s and features a glass dome over the session area, which allows free public access to the parliamentary proceedings and magnificent views of

4318-458: Is defined by the Convention on International Civil Aviation Annex 13 as an occurrence associated with the operation of an aircraft which takes place between the time any person boards the aircraft with the intention of flight until such time as all such persons have disembarked, in which a person is fatally or seriously injured, the aircraft sustains damage or structural failure or the aircraft

4445-404: Is equal to the drag D divided by the (density r times half the velocity V squared times the reference area A). [Cd = D / (A * .5 * r * V^2)] Lift-to-drag ratios for practical aircraft vary from about 4:1 for vehicles and birds with relatively short wings, up to 60:1 or more for vehicles with very long wings, such as gliders. A greater angle of attack relative to the forward movement also increases

4572-759: Is especially important for aircraft flying under instrument flight rules (IFR), when they may be in weather conditions that do not allow the pilots to see other aircraft. However, in very high-traffic areas, especially near major airports, aircraft flying under visual flight rules (VFR) are also required to follow instructions from ATC. In addition to separation from other aircraft, ATC may provide weather advisories, terrain separation, navigation assistance, and other services to pilots, depending on their workload. ATC do not control all flights. The majority of VFR (Visual Flight Rules) flights in North America are not required to contact ATC (unless they are passing through

4699-413: Is flight faster than the speed of sound . Supersonic flight is associated with the formation of shock waves that form a sonic boom that can be heard from the ground, and is frequently startling. The creation of this shockwave requires a significant amount of energy; because of this, supersonic flight is generally less efficient than subsonic flight at about 85% of the speed of sound. Hypersonic flight

4826-488: Is missing or is completely inaccessible. An accident in which the damage to the aircraft is such that it must be written off, or in which the plane is destroyed, is called a hull loss accident . The first fatal aviation accident occurred in a Wright Model A aircraft at Fort Myer, Virginia, US , on September 17, 1908, resulting in injury to the pilot, Orville Wright , and death of the passenger, Signal Corps Lieutenant Thomas Selfridge . The worst aviation accident in history

4953-467: Is nearby. The urban area of Berlin has a population of over 4.5 million and is therefore the most populous urban area in Germany. The Berlin-Brandenburg capital region has around 6.2 million inhabitants and is Germany's second-largest metropolitan region after the Rhine-Ruhr region, and the fifth-biggest metropolitan region by GDP in the European Union . Berlin was built along the banks of

5080-440: Is para-sailing, where a parachute-like object is pulled by a boat. In an airplane, lift is created by the wings; the shape of the wings of the airplane are designed specially for the type of flight desired. There are different types of wings: tempered, semi-tempered, sweptback, rectangular and elliptical. An aircraft wing is sometimes called an airfoil , which is a device that creates lift when air flows across it. Supersonic flight

5207-458: Is private or commercial and on the type of equipment involved. Many small aircraft manufacturers serve the general aviation market, with a focus on private aviation and flight training. The most important recent developments for small aircraft (which form the bulk of the GA fleet) have been the introduction of advanced avionics (including GPS ) that were formerly found only in large airliners , and

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5334-450: Is pushed in the direction opposite to flight. This can be done in several ways including by the spinning blades of a propeller , or a rotating fan pushing air out from the back of a jet engine , or by ejecting hot gases from a rocket engine . The forward thrust is proportional to the mass of the airstream multiplied by the difference in velocity of the airstream. Reverse thrust can be generated to aid braking after landing by reversing

5461-648: Is termed ballistic flight . Examples include balls , arrows , bullets , fireworks etc. Essentially an extreme form of ballistic flight, spaceflight is the use of space technology to achieve the flight of spacecraft into and through outer space . Examples include ballistic missiles , orbital spaceflight , etc. Spaceflight is used in space exploration , and also in commercial activities like space tourism and satellite telecommunications . Additional non-commercial uses of spaceflight include space observatories , reconnaissance satellites and other Earth observation satellites . A spaceflight typically begins with

5588-493: Is termed gliding . Some other things can exploit rising air to climb such as raptors (when gliding) and man-made sailplane gliders . This is termed soaring . However most other birds and all powered aircraft need a source of propulsion to climb. This is termed powered flight. The only groups of living things that use powered flight are birds , insects , and bats , while many groups have evolved gliding. The extinct pterosaurs , an order of reptiles contemporaneous with

5715-673: Is the most visited zoo in Europe. Babelsberg Studio is the world's first large-scale movie studio complex and the list of films set in Berlin is long. Berlin is also home to three World Heritage Sites : Museum Island , the Palaces and Parks of Potsdam and Berlin , and the Berlin Modernism Housing Estates . Other landmarks include the Brandenburg Gate , the Reichstag building , Potsdamer Platz ,

5842-462: Is very high speed flight where the heat generated by the compression of the air due to the motion through the air causes chemical changes to the air. Hypersonic flight is achieved primarily by reentering spacecraft such as the Space Shuttle and Soyuz . Some things generate little or no lift and move only or mostly under the action of momentum, gravity, air drag and in some cases thrust. This

5969-671: The Forum Fridericianum along with, the Berlin State Opera , Charlottenburg Palace , Gendarmenmarkt , Alte Kommandantur , as well as the City Palace . The tallest buildings in Berlin are spread across the urban area, with clusters at Potsdamer Platz , City West , and Alexanderplatz . Over one-third of the city's area consists of green and open-space, with the Großer Tiergarten , one of

6096-517: The Berlin Wall around West Berlin, and events escalated to a tank standoff at Checkpoint Charlie . West Berlin was now de facto a part of West Germany with a unique legal status, while East Berlin was de facto a part of East Germany. John F. Kennedy gave his " Ich bin ein Berliner " speech on 26 June 1963, in front of the Schöneberg city hall, located in the city's western part, underlining

6223-698: The Burgundians followed. In the 7th century Slavic tribes, the later known Hevelli and Sprevane , reached the region. In the 12th century the region came under German rule as part of the Margraviate of Brandenburg , founded by Albert the Bear in 1157. Early evidence of middle age settlements in the area of today's Berlin are remnants of a house foundation dated 1270 to 1290, found in excavations in Berlin Mitte . The first written records of towns in

6350-750: The Karl-Marx-Allee heads east, an avenue lined by monumental residential buildings, designed in the Socialist Classicism style. Adjacent to this area is the Rotes Rathaus (City Hall), with its distinctive red-brick architecture. In front of it is the Neptunbrunnen , a fountain featuring a mythological group of Tritons , personifications of the four main Prussian rivers, and Neptune on top of it. The Brandenburg Gate

6477-949: The Memorial to the Murdered Jews of Europe , and the Berlin Wall Memorial . Berlin has numerous museums , galleries, and libraries. [REDACTED] Margraviate of Brandenburg 1237–1618 [REDACTED] Brandenburg-Prussia 1618–1701 [REDACTED]   Kingdom of Prussia 1701–1867 [REDACTED] North German Confederation 1867–1871 [REDACTED]   German Empire 1871–1918 [REDACTED]   Weimar Republic 1918–1933 [REDACTED]   Nazi Germany 1933–1945 [REDACTED]   Allied-occupied Germany 1945–1949 [REDACTED]   West Germany 1949–1990 [REDACTED]   East Germany 1949–1990 [REDACTED]   Germany 1990–present Berlin lies in northeastern Germany. Most of

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6604-904: The September 11 attacks and the SARS pandemic have driven many older airlines to government-bailouts, bankruptcy or mergers. At the same time, low-cost carriers such as Ryanair , Southwest and WestJet have flourished. General aviation includes all non-scheduled civil flying, both private and commercial . General aviation may include business flights, air charter , private aviation, flight training, ballooning , paragliding , parachuting , gliding , hang gliding , aerial photography , foot-launched powered hang gliders , air ambulance, crop dusting, charter flights, traffic reporting , police air patrols and forest fire fighting. Each country regulates aviation differently, but general aviation usually falls under different regulations depending on whether it

6731-511: The Spree river, which flows into the Havel in the western borough of Spandau . The city incorporates lakes in the western and southeastern boroughs, the largest of which is Müggelsee . About one-third of the city's area is composed of forests, parks and gardens , rivers, canals, and lakes. First documented in the 13th century and at the crossing of two important historic trade routes , Berlin

6858-667: The Wayback Machine and still impacts urban planning decisions. Walter Momper, the mayor of West Berlin, became the first mayor of the reunified city in the interim. City-wide elections in December 1990 resulted in the first "all Berlin" mayor being elected to take office in January 1991, with the separate offices of mayors in East and West Berlin expiring by that time, and Eberhard Diepgen (a former mayor of West Berlin) became

6985-529: The dinosaurs , were also very successful flying animals, and there were apparently some flying dinosaurs (see Flying and gliding animals#Non-avian dinosaurs ). Each of these groups' wings evolved independently , with insects the first animal group to evolve flight. The wings of the flying vertebrate groups are all based on the forelimbs, but differ significantly in structure; insect wings are hypothesized to be highly modified versions of structures that form gills in most other groups of arthropods . Bats are

7112-832: The end of World War II in Europe in May 1945, Berlin received large numbers of refugees from the Eastern provinces. The victorious powers divided the city into four sectors, analogous to Allied-occupied Germany the sectors of the Allies of World War II (the United States, the United Kingdom, and France) formed West Berlin , while the Soviet Union formed East Berlin . All four Allies of World War II shared administrative responsibilities for Berlin. However, in 1948, when

7239-482: The thrust-to-weight ratio is greater than the local gravity strength (expressed in g s), then flight can occur without any forward motion or any aerodynamic lift being required. If the thrust-to-weight ratio times the lift-to-drag ratio is greater than local gravity then takeoff using aerodynamic lift is possible. Flight dynamics is the science of air and space vehicle orientation and control in three dimensions. The three critical flight dynamics parameters are

7366-546: The 1960s composite material airframes and quieter, more efficient engines have become available, and Concorde provided supersonic passenger service for more than two decades, but the most important lasting innovations have taken place in instrumentation and control. The arrival of solid-state electronics, the Global Positioning System , satellite communications , and increasingly small and powerful computers and LED displays, have dramatically changed

7493-423: The 19th century; the city's economy and population expanded dramatically, and it became the main railway hub and economic center of Germany. Additional suburbs soon developed and increased the area and population of Berlin. In 1861, neighboring suburbs including Wedding , Moabit and several others were incorporated into Berlin. In 1871, Berlin became capital of the newly founded German Empire . In 1881, it became

7620-502: The 20th century. 17% of Berlin's buildings are Gründerzeit or earlier and nearly 25% are of the 1920s and 1930s, when Berlin played a part in the origin of modern architecture . Devastated by the bombing of Berlin in World War II many of the buildings that had survived in both East and West were demolished during the postwar period. After the reunification, many important heritage structures have been reconstructed , including

7747-719: The Earth's atmosphere. Meanwhile, the need to decarbonize the aviation industry to face the climate crisis has increased research into aircraft powered by alternative fuels, such as ethanol , electricity , hydrogen , and even solar energy , with flying prototypes becoming more common. Civil aviation includes all non-military flying, both general aviation and scheduled air transport . There are five major manufacturers of civil transport aircraft (in alphabetical order): Boeing, Airbus, Ilyushin and Tupolev concentrate on wide-body and narrow-body jet airliners , while Bombardier, Embraer and Sukhoi concentrate on regional airliners . Large networks of specialized parts suppliers from around

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7874-795: The Federal Republic of Germany was founded in West Germany and eventually included all of the American, British and French zones, excluding those three countries' zones in Berlin, while the Marxist–Leninist German Democratic Republic was proclaimed in East Germany . West Berlin officially remained an occupied city, but it politically was aligned with the Federal Republic of Germany despite West Berlin's geographic isolation. Airline service to West Berlin

8001-526: The French War ministry. The report on the trials was not publicized until 1910, as they had been a military secret. In November 1906, Ader claimed to have made a successful flight on October 14, 1897, achieving an "uninterrupted flight" of around 300 metres (980 feet). Although widely believed at the time, these claims were later discredited. The Wright brothers made the first successful powered, controlled and sustained airplane flight on December 17, 1903,

8128-520: The Hindenburg was the first to be captured on newsreel. In 1799, Sir George Cayley set forth the concept of the modern airplane as a fixed-wing flying machine with separate systems for lift, propulsion, and control. Otto Lilienthal was the first person to make well-documented, repeated, successful flights with gliders , therefore making the idea of " heavier than air " a reality. Newspapers and magazines published photographs of Lilienthal gliding, favorably influencing public and scientific opinion about

8255-702: The Huguenot immigration. Many other immigrants came from Bohemia , Poland , and Salzburg . Since 1618, the Margraviate of Brandenburg had been in personal union with the Duchy of Prussia . In 1701, the dual state formed the Kingdom of Prussia , as Frederick III, Elector of Brandenburg , crowned himself as king Frederick I in Prussia . Berlin became the capital of the new Kingdom, replacing Königsberg . This

8382-780: The Museumsinsel U-Bahn station opened in 2021, which completed all new works on the U5. A partial opening by the end of 2020 of the Humboldt Forum museum, housed in the reconstructed Berlin Palace , was postponed until March 2021. On 16 September 2022, the opening of the eastern wing, the last section of the Humboldt Forum museum, meant the Humboldt Forum museum was finally completed. It became Germany's currently most expensive cultural project. The legal basis for

8509-458: The US support for West Berlin. Berlin was completely divided. Although it was possible for Westerners to pass to the other side through strictly controlled checkpoints, for most Easterners, travel to West Berlin or West Germany was prohibited by the government of East Germany. In 1971, a Four-Power Agreement guaranteed access to and from West Berlin by car or train through East Germany. In 1989, with

8636-625: The United States) they may use radar to see aircraft positions. Becoming an air traffic controller in the United States typically requires an associate or bachelor's degree from the Air Traffic Collegiate Training Initiative. The FAA also requires extensive training, along with medical examinations and background checks. Some controllers are required to work weekend, night, and holiday shifts. There are generally four different types of ATC: ATC

8763-623: The Western Allies extended the currency reform in the Western zones of Germany to the three western sectors of Berlin, the Soviet Union imposed the Berlin Blockade on the access routes to and from West Berlin, which lay entirely inside Soviet-controlled territory. The Berlin airlift , conducted by the three western Allies, overcame this blockade by supplying food and other supplies to the city from June 1948 to May 1949. In 1949,

8890-680: The air to overcome the drag associated with lift all takes energy. Different objects and creatures capable of flight vary in the efficiency of their muscles, motors and how well this translates into forward thrust. Propulsive efficiency determines how much energy vehicles generate from a unit of fuel. The range that powered flight articles can achieve is ultimately limited by their drag, as well as how much energy they can store on board and how efficiently they can turn that energy into propulsion. Berlin Berlin ( / b ɜːr ˈ l ɪ n / bur- LIN , German: [bɛʁˈliːn] )

9017-601: The angles of rotation in three dimensions about the vehicle's center of mass , known as pitch , roll and yaw (See Tait-Bryan rotations for an explanation). The control of these dimensions can involve a horizontal stabilizer (i.e. "a tail"), ailerons and other movable aerodynamic devices which control angular stability i.e. flight attitude (which in turn affects altitude , heading ). Wings are often angled slightly upwards- they have "positive dihedral angle " which gives inherent roll stabilization. To create thrust so as to be able to gain height, and to push through

9144-554: The area of Berlin from 66 to 883 km (25 to 341 sq mi). The population almost doubled, and Berlin had a population of around four million. During the Weimar era , Berlin underwent political unrest due to economic uncertainties but also became a renowned center of the Roaring Twenties . The metropolis experienced its heyday as a major world capital and was known for its leadership roles in science, technology, arts,

9271-572: The area of modern Berlin are dated around 60,000 BC. A deer mask, dated to 9,000 BC, is attributed to the Maglemosian culture . In 2,000 BC dense human settlements along the Spree and Havel rivers gave rise to the Lusatian culture . Starting around 500 BC Germanic tribes settled in a number of villages in the higher situated areas of today's Berlin. After the Semnones left around 200 AD,

9398-419: The area of present-day Berlin date from the late 12th century. Spandau is first mentioned in 1197 and Köpenick in 1209. 1237 is considered the founding date of the city. The two towns over time formed close economic and social ties, and profited from the staple right on the two important trade routes , one was known as Via Imperii , and the other trade route reached from Bruges to Novgorod . In 1307

9525-459: The capital of all of Germany. Due to its geographic location and history, Berlin has been called "the heart of Europe". The economy of Berlin is based on high tech and the service sector , encompassing a diverse range of creative industries , startup companies , research facilities, and media corporations. Berlin serves as a continental hub for air and rail traffic and has a complex public transportation network . Tourism in Berlin makes

9652-400: The car stable on the road. For a solid object moving through a fluid, the drag is the component of the net aerodynamic or hydrodynamic force acting opposite to the direction of the movement. Therefore, drag opposes the motion of the object, and in a powered vehicle it must be overcome by thrust . The process which creates lift also causes some drag. Aerodynamic lift is created by

9779-567: The cities and villages in northeastern Germany bear Slavic languages -derived names. Typical Germanization for place name suffixes of Slavic origin are -ow, -itz, -vitz, -witz, -itzsch and -in , prefixes are Windisch and Wendisch . The name Berlin has its roots in the language of the West Slavs , and may be related to the Old Polabian stem berl-/birl- ("swamp"). Of Berlin's twelve boroughs , five bear

9906-752: The city a popular global destination. Significant industries include information technology, the healthcare industry , biomedical engineering , biotechnology , the automotive industry , and electronics . Berlin is home to several universities such as the Humboldt University of Berlin , Technische Universität Berlin , the Berlin University of the Arts and the Free University of Berlin . The Berlin Zoological Garden

10033-521: The city lost half of its population. Frederick William , known as the "Great Elector", who had succeeded his father George William as ruler in 1640, initiated a policy of promoting immigration and religious tolerance. With the Edict of Potsdam in 1685, Frederick William offered asylum to the French Huguenots . By 1700, approximately 30 percent of Berlin's residents were French, because of

10160-418: The cockpits of airliners and, increasingly, of smaller aircraft as well. Pilots can navigate much more accurately and view terrain, obstructions, and other nearby aircraft on a map or through synthetic vision , even at night or in low visibility. On June 21, 2004, SpaceShipOne became the first privately funded aircraft to make a spaceflight , opening the possibility of an aviation market capable of leaving

10287-512: The coldest was January 1709 , with a mean temperature of −13.2 °C (8.2 °F). The wettest month on record was July 1907, with 230 millimeters (9.1 in) of rainfall, whereas the driest were October 1866, November 1902, October 1908 and September 1928, all with 1 millimeter (0.039 in) of rainfall. Berlin's history has left the city with a polycentric metropolitan area and an eclectic mix of architecture. The city's appearance today has been predominantly shaped by German history during

10414-463: The country) to about 80,000 due to emigration between 1933 and 1939. After Kristallnacht in 1938, thousands of the city's Jews were imprisoned in the nearby Sachsenhausen concentration camp . Starting in early 1943, many were deported to ghettos like Łódź , and to concentration and extermination camps such as Auschwitz . Berlin hosted the 1936 Summer Olympics for which the Olympic stadium

10541-486: The craft is heavier than air, it must generate lift to overcome its weight . The wind resistance caused by the craft moving through the air is called drag and is overcome by propulsive thrust except in the case of gliding . Some vehicles also use thrust in the place of lift; for example rockets and Harrier jump jets . Forces relevant to flight are These forces must be balanced for stable flight to occur. A fixed-wing aircraft generates forward thrust when air

10668-443: The drag coefficient, CL/CD. The lift coefficient Cl is equal to the lift L divided by the (density r times half the velocity V squared times the wing area A). [Cl = L / (A * .5 * r * V^2)] The lift coefficient is also affected by the compressibility of the air, which is much greater at higher speeds, so velocity V is not a linear function. Compressibility is also affected by the shape of the aircraft surfaces. The drag coefficient Cd

10795-593: The end of October, and flights to and from Tegel Airport ending in November. Due to the fall in passenger numbers resulting from the COVID-19 pandemic , plans were announced to close BER's Terminal 5, the former Schönefeld Airport , beginning in March 2021. The connecting link of U-Bahn line U5 from Alexanderplatz to Hauptbahnhof, along with the new stations Rotes Rathaus and Unter den Linden, opened on 4 December 2020,

10922-717: The end of the Cold War and pressure from the East German population, the Berlin Wall fell on 9 November and was subsequently mostly demolished. Today, the East Side Gallery preserves a large portion of the wall. On 3 October 1990, the two parts of Germany were reunified as the Federal Republic of Germany, and Berlin again became a reunified city. After the fall of the Berlin Wall, the city experienced significant urban development Archived 16 December 2023 at

11049-411: The extent of deflection, and thus generates extra lift. However a greater angle of attack also generates extra drag. Lift/drag ratio also determines the glide ratio and gliding range. Since the glide ratio is based only on the relationship of the aerodynamics forces acting on the aircraft, aircraft weight will not affect it. The only effect weight has is to vary the time that the aircraft will glide for –

11176-433: The first jet aircraft and the first liquid-fueled rockets . After World War II, especially in North America, there was a boom in general aviation , both private and commercial, as thousands of pilots were released from military service and many inexpensive war-surplus transport and training aircraft became available. Manufacturers such as Cessna , Piper , and Beechcraft expanded production to provide light aircraft for

11303-642: The first aircraft to transport passengers and cargo over great distances. The best known aircraft of this type were manufactured by the German Zeppelin company. The most successful Zeppelin was the Graf Zeppelin . It flew over one million miles, including an around-the-world flight in August 1929. However, the dominance of the Zeppelins over the airplanes of that period, which had a range of only

11430-499: The first elected mayor of a reunited Berlin. On 18 June 1994, soldiers from the United States, France and Britain marched in a parade which was part of the ceremonies to mark the withdrawal of allied occupation troops allowing a reunified Berlin (the last Russian troops departed on 31 August, while the final departure of Western Allies forces was on 8 September 1994). On 20 June 1991, the Bundestag (German Parliament) voted to move

11557-462: The first half of the 19th century, and in the second half of the 19th century Otto Lilienthal made over 200 gliding flights and was also one of the first to understand flight scientifically. His work was replicated and extended by the Wright brothers who made gliding flights and finally the first controlled and extended, manned powered flights. Spaceflight, particularly human spaceflight became

11684-407: The first passenger, Charles Furnas, one of their mechanics, on May 14, 1908. During the 1920s and 1930s great progress was made in the field of aviation, including the first transatlantic flight of Alcock and Brown in 1919, Charles Lindbergh 's solo transatlantic flight in 1927, and Charles Kingsford Smith 's transpacific flight the following year. One of the most successful designs of this period

11811-570: The first untethered human lighter-than-air flight on November 21, 1783, of a hot air balloon designed by the Montgolfier brothers . The usefulness of balloons was limited because they could only travel downwind. It was immediately recognized that a steerable, or dirigible , balloon was required. Jean-Pierre Blanchard flew the first human-powered dirigible in 1784 and crossed the English Channel in one in 1785. Rigid airships became

11938-413: The flying automaton of Archytas of Tarentum (428–347 BC). Later, somewhat more credible claims of short-distance human flights appear, such as the winged flights of Abbas ibn Firnas (810–887, recorded in the 17th century), Eilmer of Malmesbury (11th century, recorded in the 12th century), and the hot-air Passarola of Bartholomeu Lourenço de Gusmão (1685–1724). The modern age of aviation began with

12065-577: The humanities, city planning, film, higher education, government, and industries. Albert Einstein rose to public prominence during his years in Berlin, being awarded the Nobel Prize for Physics in 1921. In 1933, Adolf Hitler and the Nazi Party came to power . Hitler was inspired by the architecture he had experienced in Vienna , and he wished for a German Empire with a capital city that had

12192-406: The introduction of composite materials to make small aircraft lighter and faster. Ultralight and homebuilt aircraft have also become increasingly popular for recreational use, since in most countries that allow private aviation, they are much less expensive and less heavily regulated than certified aircraft. Simple balloons were used as surveillance aircraft as early as the 18th century. Over

12319-518: The largest and most popular parks in Berlin, located in the centre of the city. The Fernsehturm (TV tower) at Alexanderplatz in Mitte is among the tallest structures in the European Union at 368 m (1,207 ft). Built in 1969, it is visible throughout most of the central districts of Berlin. The city can be viewed from its 204-meter-high (669 ft) observation floor. Starting here,

12446-726: The low plateaus on both sides of the Spree Valley. Large parts of the boroughs Reinickendorf and Pankow lie on the Barnim Plateau, while most of the boroughs of Charlottenburg-Wilmersdorf , Steglitz-Zehlendorf , Tempelhof-Schöneberg , and Neukölln lie on the Teltow Plateau. The borough of Spandau lies partly within the Berlin Glacial Valley and partly on the Nauen Plain, which stretches to

12573-921: The lowest is the Spektesee in Spandau, at 28.1 meters (92 ft) elevation. Berlin has an oceanic climate ( Köppen : Cfb ) bordering on a humid continental climate ( Dfb ). This type of climate features mild to very warm summer temperatures and cold, though not very severe, winters. Annual precipitation is modest. Frosts are common in winter, and there are larger temperature differences between seasons than typical for many oceanic climates . Summers are warm and sometimes humid with average high temperatures of 22–25 °C (72–77 °F) and lows of 12–14 °C (54–57 °F). Winters are cold with average high temperatures of 3 °C (37 °F) and lows of −2 to 0 °C (28 to 32 °F). Spring and autumn are generally chilly to mild. Berlin's built-up area creates

12700-416: The most significant advancements in aviation technology came with the controlled gliding flying of Otto Lilienthal in 1896; then a large step in significance came with the construction of the first powered airplane by the Wright brothers in the early 1900s. Since that time, aviation has been technologically revolutionized by the introduction of the jet which permitted a major form of transport throughout

12827-663: The motion of an aerodynamic object (wing) through the air, which due to its shape and angle deflects the air. For sustained straight and level flight, lift must be equal and opposite to weight. In general, long narrow wings are able deflect a large amount of air at a slow speed, whereas smaller wings need a higher forward speed to deflect an equivalent amount of air and thus generate an equivalent amount of lift. Large cargo aircraft tend to use longer wings with higher angles of attack, whereas supersonic aircraft tend to have short wings and rely heavily on high forward speed to generate lift. However, this lift (deflection) process inevitably causes

12954-497: The new middle-class market. By the 1950s, the development of civil jets grew, beginning with the de Havilland Comet , though the first widely used passenger jet was the Boeing 707 , because it was much more economical than other aircraft at that time. At the same time, turboprop propulsion started to appear for smaller commuter planes, making it possible to serve small-volume routes in a much wider range of weather conditions. Since

13081-427: The only mammals capable of sustaining level flight (see bat flight ). However, there are several gliding mammals which are able to glide from tree to tree using fleshy membranes between their limbs; some can travel hundreds of meters in this way with very little loss in height. Flying frogs use greatly enlarged webbed feet for a similar purpose, and there are flying lizards which fold out their mobile ribs into

13208-412: The operation of aircraft, are reduced and controlled to an acceptable level. It encompasses the theory, practice, investigation, and categorization of flight failures, and the prevention of such failures through regulation, education, and training. It can also be applied in the context of campaigns that inform the public as to the safety of air travel. A maintenance, repair, and overhaul organization (MRO)

13335-410: The pitch of variable-pitch propeller blades, or using a thrust reverser on a jet engine. Rotary wing aircraft and thrust vectoring V/STOL aircraft use engine thrust to support the weight of the aircraft, and vector sum of this thrust fore and aft to control forward speed. In the context of an air flow relative to a flying body, the lift force is the component of the aerodynamic force that

13462-548: The possibility of flying machines becoming practical. Lilienthal's work led to him developing the concept of the modern wing. His flight attempts in Berlin in 1891 are seen as the beginning of human flight and the " Lilienthal Normalsegelapparat " is considered to be the first airplane in series production, making the Maschinenfabrik Otto Lilienthal in Berlin the first air plane production company in

13589-410: The purview of aerospace engineering which is subdivided into aeronautics , the study of vehicles that travel through the atmosphere, and astronautics , the study of vehicles that travel through space, and ballistics , the study of the flight of projectiles. Humans have managed to construct lighter-than-air vehicles that raise off the ground and fly, due to their buoyancy in the air. An aerostat

13716-427: The same function without requiring that the aircraft move forward through the air). While common meanings of the word " lift " suggest that lift opposes gravity, aerodynamic lift can be in any direction. When an aircraft is cruising for example, lift does oppose gravity, but lift occurs at an angle when climbing, descending or banking. On high-speed cars, the lift force is directed downwards (called "down-force") to keep

13843-584: The seat of the German capital from Bonn to Berlin, which was completed in 1999, during the chancellorship of Gerhard Schröder . Berlin's 2001 administrative reform merged several boroughs, reducing their number from 23 to 12. In 2006, the FIFA World Cup Final was held in Berlin. Construction of the "Berlin Wall Trail" (Berliner Mauerweg) began in 2002 and was completed in 2006. In

13970-783: The town citizens against the building culminated in 1448, in the "Berlin Indignation" ("Berliner Unwille"). Officially, the Berlin-Cölln palace became permanent residence of the Brandenburg electors of the Hohenzollerns from 1486, when John Cicero came to power. Berlin-Cölln, however, had to give up its status as a free Hanseatic League city. In 1539, the electors and the city officially became Lutheran . The Thirty Years' War between 1618 and 1648 devastated Berlin. One third of its houses were damaged or destroyed, and

14097-474: The two towns formed an alliance with a common external policy, their internal administrations still being separated. Members of the Hohenzollern family ruled in Berlin until 1918, first as electors of Brandenburg, then as kings of Prussia , and eventually as German emperors . In 1443, Frederick II Irontooth started the construction of a new royal palace in the twin city Berlin-Cölln. The protests of

14224-455: The vast Northern European Plain which stretches all the way from northern France to western Russia. The Berliner Urstromtal (an ice age glacial valley ), between the low Barnim Plateau to the north and the Teltow plateau to the south, was formed by meltwater flowing from ice sheets at the end of the last Weichselian glaciation . The Spree follows this valley now. In Spandau, a borough in

14351-693: The west of Berlin, the Spree empties into the river Havel , which flows from north to south through western Berlin. The course of the Havel is more like a chain of lakes, the largest being the Tegeler See and the Großer Wannsee . A series of lakes also feeds into the upper Spree, which flows through the Großer Müggelsee in eastern Berlin. Substantial parts of present-day Berlin extend onto

14478-590: The west of Berlin. Since 2015, the Arkenberge hills in Pankow at 122 meters (400 ft) elevation, have been the highest point in Berlin. Through the disposal of construction debris they surpassed Teufelsberg (120.1 m or 394 ft), which itself was made up of rubble from the ruins of the Second World War. The Müggelberge at 114.7 meters (376 ft) elevation is the highest natural point and

14605-601: The world support these manufacturers, who sometimes provide only the initial design and final assembly in their own plants. The Chinese ACAC consortium has also recently entered the civil transport market with its Comac ARJ21 regional jet. Until the 1970s, most major airlines were flag carriers , sponsored by their governments and heavily protected from competition. Since then, open skies agreements have resulted in increased competition and choice for consumers, coupled with falling prices for airlines. The combination of high fuel prices, low fares, high salaries, and crises such as

14732-646: The world. The word aviation was coined by the French writer and former naval officer Gabriel La Landelle in 1863. He originally derived the term from the verb avier (an unsuccessful neologism for "to fly"), itself derived from the Latin word avis ("bird") and the suffix -ation . There are early legends of human flight such as the stories of Icarus in Greek myth, Jamshid and Shah Kay Kāvus in Persian myth, and

14859-421: The world. Lilienthal is often referred to as either the "father of aviation" or "father of flight". Early dirigible developments included machine-powered propulsion ( Henri Giffard , 1852), rigid frames ( David Schwarz , 1896) and improved speed and maneuverability ( Alberto Santos-Dumont , 1901) There are many competing claims for the earliest powered, heavier-than-air flight. The first recorded powered flight

14986-442: The years, military aircraft have been built to meet ever increasing capability requirements. Manufacturers of military aircraft compete for contracts to supply their government's arsenal. Aircraft are selected based on factors like cost, performance, and the speed of production. Aviation safety means the state of an aviation system or organization in which risks associated with aviation activities, related to, or in direct support of

15113-477: Was a successful attempt to centralise the capital in the very far-flung state, and it was the first time the city began to grow. In 1709, Berlin merged with the four cities of Cölln, Friedrichswerder, Friedrichstadt and Dorotheenstadt under the name Berlin, "Haupt- und Residenzstadt Berlin". In 1740, Frederick II, known as Frederick the Great (1740–1786), came to power. Under the rule of Frederick II, Berlin became

15240-411: Was an unsuccessful attempt of unifying the states of Berlin and Brandenburg. Both share a common history, dialect and culture and in 2020, there are over 225,000 residents of Brandenburg that commute to Berlin. The fusion had the near-unanimous support by a broad coalition of both state governments, political parties, media, business associations, trade unions and churches. Though Berlin voted in favor by

15367-487: Was built. During World War II , Berlin was the location of multiple Nazi prisons, forced labour camps, 17 subcamps of the Sachsenhausen concentration camp for men and women, including teenagers, of various nationalities, including Polish, Jewish, French, Belgian, Czechoslovak, Russian, Ukrainian, Romani, Dutch, Greek, Norwegian, Spanish, Luxembourgish, German, Austrian, Italian, Yugoslavian, Bulgarian, Hungarian,

15494-467: Was carried out by Clément Ader on October 9, 1890, in his bat-winged, fully self-propelled fixed-wing aircraft , the Ader Éole . It was reportedly the first manned, powered, heavier-than-air flight of a significant distance (50 m (160 ft)) but insignificant altitude from level ground. Seven years later, on October 14, 1897, Ader's Avion III was tested without success in front of two officials from

15621-598: Was designated the capital of the Margraviate of Brandenburg (1417–1701), Kingdom of Prussia (1701–1918), German Empire (1871–1918), Weimar Republic (1919–1933), and Nazi Germany (1933–1945). Berlin served as a scientific, artistic, and philosophical hub during the Age of Enlightenment , Neoclassicism , and the German revolutions of 1848–1849 . During the Gründerzeit , an industrialization-induced economic boom triggered

15748-490: Was granted only to American, British and French airlines. The founding of the two German states increased Cold War tensions. West Berlin was surrounded by East German territory, and East Germany proclaimed the Eastern part as its capital, a move the western powers did not recognize. East Berlin included most of the city's historic center. The West German government established itself in Bonn . In 1961, East Germany began to build

15875-412: Was highly flammable and allowed static electricity to build up in the airship. Changes to the coating formulation reduced the risk of further Hindenburg type accidents. Although there have been periodic initiatives to revive their use, airships have seen only niche application since that time. There had been previous airship accidents that were more fatal, for instance, a British R38 on 23 August 1921, but

16002-550: Was the Douglas DC-3 , which became the first airliner to be profitable carrying passengers exclusively, starting the modern era of passenger airline service. By the beginning of World War II, many towns and cities had built airports, and there were numerous qualified pilots available. During World War II one of the first jet engines was developed by Hans con Ohain, and accomplished the world's first jet-powered flight in 1939. The war brought many innovations to aviation, including

16129-820: Was the Tenerife airport disaster on March 27, 1977, when 583 people died when two Boeing 747 jumbo jets, operated by Pan Am and KLM collided on a runway in Los Rodeos airport, now known as Tenerife North. An aviation incident is defined as an occurrence, other than an accident, associated with the operation of an aircraft that affects or could affect the safety of operations. Air traffic control (ATC) involves communication with aircraft to help maintain separation – that is, they ensure that aircraft are sufficiently far enough apart horizontally or vertically for no risk of collision. Controllers may co-ordinate position reports provided by pilots, or in high traffic areas (such as

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