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Aircraft Propulsion
A powered aircraft is an aircraft that uses onboard propulsion with mechanical power generated by an aircraft engine of some kind. Aircraft propulsion nearly always uses either a type of propeller, or a form of jet propulsion. Other potential propulsion techniques such as ornithopters are very rarely used. Methods of propulsion Rotating aerofoils Propeller aircraft A propeller or airscrew comprises a set of small, wing-like aerofoil ''blades'' set around a central hub which spins on an axis aligned in the direction of travel. The blades are set at a '' pitch'' angle to the airflow, which may be fixed or variable, such that spinning the propeller creates aerodynamic lift, or ''thrust'', in a forward direction. A ''tractor'' design mounts the propeller in front of the power source, while a '' pusher'' design mounts it behind. Although the pusher design allows cleaner airflow over the wing, tractor configuration is more common because it allows cleaner airflow to the prope ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alitalia
Alitalia - Società Aerea Italiana Società per azioni, S.p.A., operating as Alitalia (), was an Italian airline which was once the flag carrier and largest airline of Italy. The company had its head office in Fiumicino, Metropolitan City of Rome Capital. The airline was owned by the Government of Italy from its founding in 1946 until it was Privatization, privatized in 2009; after struggling with profitability while a private company, including failed negotiations to sell to other private parties, the Italian government took ownership of the airline in March 2020. The airline operated a fleet of Airbus A319-100, Airbus A320-200, Airbus A321-100, Airbus A330-200, and Boeing 777-200ER aircraft to over 34 scheduled domestic, European and intercontinental destinations. The airline operated from its main hub at Leonardo da Vinci–Fiumicino Airport. The airline was a full member of SkyTeam alliance, and it had codeshare agreements with 42 airlines. In 2018, the airline was the List ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirigible
An airship or dirigible balloon is a type of aerostat or lighter-than-air aircraft that can navigate through the air under its own power. Aerostats gain their lift from a lifting gas that is less dense than the surrounding air. In early dirigibles, the lifting gas used was hydrogen, due to its high lifting capacity and ready availability. Helium gas has almost the same lifting capacity and is not flammable, unlike hydrogen, but is rare and relatively expensive. Significant amounts were first discovered in the United States and for a while helium was only available for airships in that country. Most airships built since the 1960s have used helium, though some have used hot air.A few airships after World War II used hydrogen. The first British airship to use helium was the ''Chitty Bang Bang'' of 1967. The envelope of an airship may form the gasbag, or it may contain a number of gas-filled cells. An airship also has engines, crew, and optionally also payload accommodation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Front Electric Sustainer
Front electric sustainer (FES) is a propulsion system for gliders that uses an electric motor powered by batteries and a foldable propeller. It is produced by LZ Design d.o.o. in Logatec, Slovenia. The system uses a 22 kW compact outrunner brushless DC electric motor located in the nose of the sailplane. Power is provided by two lithium-ion battery packs. Lighter gliders are able to self-launch with FES. Heavier gliders can use it as a sustainer system, i.e. climb and cruise sufficiently high and far to avoid an out-landing. Although gliders with FES have a shorter range (70–100 km) under power than gliders with two-stroke gasoline sustainer engines (10 litres at 8.5 L/h at 100 km/h = 120 km) or jet sustaining engines (150–200 km), the electric motor can be expected to start reliably provided there is sufficient energy in the batteries. The one-metre diameter propeller is made of carbon fibre and folds across the nose. It opens using centrifugal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propfan
A propfan, also called an open rotor engine, or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The design is intended to offer the speed and performance of a turbofan, with the fuel economy of a turboprop. A propfan is typically designed with a large number of short, highly twisted blades, similar to the (ducted) fan in a turbofan engine. For this reason, the propfan has been variously described as an "unducted fan" (UDF) or an "ultra-high-bypass (UHB) turbofan." Definition In the 1970s, Hamilton Standard described its propfan as "a small diameter, highly loaded multiple bladed variable pitch propulsor having swept blades with thin advanced airfoil sections, integrated with a nacelle contoured to retard the airflow through the blades thereby reducing compressibility losses and designed to operate with a turbine engine and using a single stage reduction gear resulting i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turboprop
A turboprop is a turbine engine that drives an aircraft propeller. A turboprop consists of an intake, reduction gearbox, compressor, combustor, turbine, and a propelling nozzle. Air enters the intake and is compressed by the compressor. Fuel is then added to the compressed air in the combustor, where the fuel-air mixture then combusts. The hot combustion gases expand through the turbine stages, generating power at the point of exhaust. Some of the power generated by the turbine is used to drive the compressor and electric generator. The gases are then exhausted from the turbine. In contrast to a turbojet or turbofan, the engine's exhaust gases do not provide enough energy to create significant thrust, since almost all of the engine's power is used to drive the propeller. Technological aspects Exhaust thrust in a turboprop is sacrificed in favor of shaft power, which is obtained by extracting additional power (beyond that necessary to drive the compressor) from turbine ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internal Combustion Engine
An internal combustion engine (ICE or IC engine) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high-pressure gases produced by combustion applies direct force to some component of the engine. The force is typically applied to pistons ( piston engine), turbine blades (gas turbine), a rotor (Wankel engine), or a nozzle ( jet engine). This force moves the component over a distance, transforming chemical energy into kinetic energy which is used to propel, move or power whatever the engine is attached to. This replaced the external combustion engine for applications where the weight or size of an engine was more important. The first commercially successful internal combustion engine was created by Étienne Lenoir around 1860, and the first modern internal combustion engine, known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing military alliances: the Allies and the Axis powers. World War II was a total war that directly involved more than 100 million personnel from more than 30 countries. The major participants in the war threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. Aircraft played a major role in the conflict, enabling the strategic bombing of population centres and deploying the only two nuclear weapons ever used in war. World War II was by far the deadliest conflict in human history; it resulted in 70 to 85 million fatalities, mostly among civilians. Tens of millions died due to genocides (including the Holocaust), starvation, ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Frost
William Frost (28 May 1848 – March 1935) was a Welsh designer of an early flying machine, the Frost Airship Glider. Biography William Frost was born on 28 May 1848 in Saundersfoot, Pembrokeshire, to Rebecca and John Frost. His ambition to invent a flying machine started about 1880. Despite his poverty he constructed the "Frost Airship Glider", which seems, in principle, to have resembled a vertical takeoff airplane, with gas-filled tanks. From the patent description: The flying machine is propelled into the air by two reversible revolving horizontally. When sufficient height is gained, wings are spread and tilted by means of a lever, causing the machine to float onward and downward. When low enough the lever is reversed causing it to rise upward & onward. When required to stop it the wings are tilted so as to hold against the wind or air and lowered by the reversible fans. The steering is done by a helm fitted to front of machine. The patent seems to contradict itself ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steam Engine
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder. This pushing force can be transformed, by a connecting rod and crank, into rotational force for work. The term "steam engine" is generally applied only to reciprocating engines as just described, not to the steam turbine. Steam engines are external combustion engines, where the working fluid is separated from the combustion products. The ideal thermodynamic cycle used to analyze this process is called the Rankine cycle. In general usage, the term ''steam engine'' can refer to either complete steam plants (including boilers etc.), such as railway steam locomotives and portable engines, or may refer to the piston or turbine machinery alone, as in the beam engine and stationary steam engine. Although steam-driven devices were known as early as the aeolipile in the f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henri Giffard
Baptiste Jules Henri Jacques Giffard (8 February 182514 April 1882) was a French engineer. In 1852 he invented the steam injector and the powered Giffard dirigible airship. Career Giffard was born in Paris in 1825. He invented the injector and the Giffard dirigible, an airship powered with a steam engine and weighing over 180 kg (400 lb). It was the world's first passenger-carrying airship (then known as a dirigible, from French). Both practical and steerable, the hydrogen-filled airship was equipped with a 3 hp steam engine that drove a propeller. The engine was fitted with a downward-pointing funnel. The exhaust steam was mixed in with the combustion gases and it was hoped by these means to stop sparks rising up to the gas bag; he also installed a vertical rudder. On 24 September 1852, Giffard made the first powered and controlled flight travelling 27 km from Paris to Élancourt. The wind was too strong to allow him to make way against it, so he was unabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steam Aircraft
A steam-powered aircraft is an aircraft propelled by a steam engine. Steam power was used during the 19th century, but fell into disuse with the arrival of the more practical internal combustion engine at the beginning of the pioneer era. Steam power is distinct from its use as a lifting gas in thermal airships and early balloons. History * 1842: The Aerial Steam Carriage of William Samuel Henson and John Stringfellow was patented, but was never successful, although a steam-powered model was flown in 1848. * 1852: Henri Giffard flew a 3-horsepower (2 kW) steam-powered dirigible over Paris; it was the first powered aircraft. * 1861 Gustave Ponton d'Amécourt made a small steam-powered craft, coining the name helicopter. * 1874: Félix du Temple flew a steam-powered aluminium monoplane off a downhill run. While it did not achieve level flight, it was the first manned heavier-than-air powered flight. * 1877: Enrico Forlanini built and flew a model steam-powered helicop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gossamer Albatross II In Flight
Gossamer most commonly refers to: * Fine spider silk used by spiderlings for ballooning or kiting * Gossamer (fabric), very light, sheer, gauze-like fabric Gossamer may also refer to: Technology * Gossamer Condor, the first human-powered aircraft capable of controlled and sustained flight * Gossamer Albatross, a human-powered aircraft built by American aeronautical engineer Dr. Paul B. MacCready's AeroVironment * The code name of the motherboard used in first-generation Apple G3 Macs Culture * The Gossamer Project (or Gossamer Archive), a large ''X-Files'' fan fiction archive * Gossamer (Looney Tunes), a character in the ''Looney Tunes'' cartoons * Gossamer, alias of two different DC Comics superheroes, Ayla Ranzz and Jay Nakamura Literature * '' The Gossamer Years'', an English title for the Japanese classical work of literature ''Kagerō Nikki'' * ''Gossamer'' (novel), a 2006 novel by Lois Lowry * Gossamer, a 1995 short story by Stephen Baxter in his collection ''Vacu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_with_front-end_electric_sustainer_(FES).jpg "Click for more on -> Front Electric Sustainer")
.jpg "Click for more on -> Propfan")
