80-605: AgustaWestland was an Anglo-Italian helicopter design and manufacturing company, which was a wholly owned subsidiary of Finmeccanica (now known as Leonardo). It was formed in July 2000 as an Anglo-Italian multinational company , when Finmeccanica and GKN merged their respective helicopter subsidiaries ( Agusta and Westland Helicopters ) to form AgustaWestland, with each holding a 50% share. Finmeccanica acquired GKN's stake in AgustaWestland in 2004. In 2016, AgustaWestland
160-620: A Polish helicopter manufacturer. In September 2012, AgustaWestland and Northrop Grumman announced the signing of a comprehensive teaming agreement under which the companies would jointly bid for contracts to build the U.S. Air Force Combat Rescue helicopter and U.S. Navy's new "Marine One" presidential helicopter. In March 2013, AgustaWestland announced its Project Zero hybrid tiltrotor/fan-in-wing technology demonstrator. The unmanned demonstrator made its first tethered flight in June 2011 at AgustaWestland's Cascina Costa, Italy facility. According to
240-605: A bribe. On 12 February 2013, Giuseppe Orsi , the CEO of Finmeccanica, was arrested by Italian authorities; the following day Indian Defence Minister A.K. Antony ordered a probe into the contract. In January 2014, India cancelled the US$ 630 ;million deal, subsequently recovering the sum which it had paid. In 2016, following a corporate reorganisation, AgustaWestland merged into Leonardo S.p.A. , Finmeccanica's new name. With this reorganidation, AgustaWestland ceased to exist as
320-439: A business model based on forming strategic partnerships with foreign, usually American, companies with the licensed production of those companies products, whilst building up their own ability to design and manufacture helicopters through a process of workshare and technology transfer. Though initially loose these partnerships settled down to the pairing of Mitsubishi with Sikorsky, Kawasaki with Boeing, and Subaru with Bell. With
400-444: A collective input is made, all the blades change equally, and the result is the helicopter increasing or decreasing in altitude. A swashplate controls the collective and cyclic pitch of the main blades. The swashplate moves up and down, along the main shaft, to change the pitch of both blades. This causes the helicopter to push air downward or upward, depending on the angle of attack . The swashplate can also change its angle to move
480-417: A constant altitude. The pedals serve the same function in both a helicopter and a fixed-wing aircraft, to maintain balanced flight. This is done by applying a pedal input in whichever direction is necessary to center the ball in the turn and bank indicator . Due to the operating characteristics of the helicopter—its ability to take off and land vertically, and to hover for extended periods of time, as well as
560-500: A few more flights and achieved a height of nearly 2.0 metres (6.5 ft), but it proved to be unstable and was abandoned. Helicopter manufacturer Helicopter manufacturers belong to the broader category of aerospace manufacturers . It is useful to think of helicopter manufacturers as falling into two categories, those that can design, certify and manufacture new helicopter designs from scratch and those that can only manufacture extant designs under license . Boeing Vertol
640-463: A gift by their father, would inspire the Wright brothers to pursue the dream of flight. In 1861, the word "helicopter" was coined by Gustave de Ponton d'Amécourt , a French inventor who demonstrated a small steam-powered model. While celebrated as an innovative use of a new metal, aluminum, the model never lifted off the ground. D'Amecourt's linguistic contribution would survive to eventually describe
720-405: A helicopter determines the size, function and capability of that helicopter design. The earliest helicopter engines were simple mechanical devices, such as rubber bands or spindles, which relegated the size of helicopters to toys and small models. For a half century before the first airplane flight, steam engines were used to forward the development of the understanding of helicopter aerodynamics, but
800-510: A helicopter powered by a gasoline engine with box kites attached to a mast by cables for a rotor, but it never flew. In 1906, two French brothers, Jacques and Louis Breguet , began experimenting with airfoils for helicopters. In 1907, those experiments resulted in the Gyroplane No.1 , possibly as the earliest known example of a quadcopter. Although there is some uncertainty about the date, sometime between 14 August and 29 September 1907,
880-416: A helicopter. This is because a helicopter generates its own gusty air while in a hover, which acts against the fuselage and flight control surfaces. The result is constant control inputs and corrections by the pilot to keep the helicopter where it is required to be. Despite the complexity of the task, the control inputs in a hover are simple. The cyclic is used to eliminate drift in the horizontal plane, that
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#1732783364516960-477: A process of rebracketing , the word is often (erroneously, from an etymological point of view) perceived by English speakers as consisting of heli- and -copter , leading to words like helipad and quadcopter . English language nicknames for "helicopter" include "chopper", "copter", "heli", and "whirlybird". In the United States military, the common slang is "helo" pronounced /ˈhiː.loʊ/. A helicopter
1040-494: A rotor. The spinning creates lift, and the toy flies when released. The 4th-century AD Daoist book Baopuzi by Ge Hong ( 抱朴子 "Master who Embraces Simplicity") reportedly describes some of the ideas inherent to rotary wing aircraft. Designs similar to the Chinese helicopter toy appeared in some Renaissance paintings and other works. In the 18th and early 19th centuries Western scientists developed flying machines based on
1120-515: A separate company, and it became Leonardo's helicopter division. In 2020 Leonardo relaunched the "Agusta" brand for the VIP helicopter sector. The launch of the new brand was announced during Expo 2020 in Dubai. Comparable major helicopter manufacturers : Helicopter A helicopter is a type of rotorcraft in which lift and thrust are supplied by horizontally spinning rotors . This allows
1200-441: A single main rotor, but torque created by its aerodynamic drag must be countered by an opposed torque. The design that Igor Sikorsky settled on for his VS-300 was a smaller tail rotor. The tail rotor pushes or pulls against the tail to counter the torque effect, and this has become the most common configuration for helicopter design, usually at the end of a tail boom . Some helicopters use other anti-torque controls instead of
1280-417: A state called translational lift which provides extra lift without increasing power. This state, most typically, occurs when the airspeed reaches approximately 16–24 knots (30–44 km/h; 18–28 mph), and may be necessary for a helicopter to obtain flight. In forward flight a helicopter's flight controls behave more like those of a fixed-wing aircraft. Applying forward pressure on the cyclic will cause
1360-558: A system similar to the OKBs of the Soviet Union, where bidding companies whose designs were not chosen would be allowed to bid as subcontractors on the winning design. In 2018, the civil or parapublic market over five seats was dominated by Airbus Helicopters with 356 deliveries, a 54% share, ahead of Leonardo Helicopters (21%), Bell Helicopters (12%), Russian Helicopters (10%), Sikorsky Aircraft (1%) and others (2%). Cicaré
1440-527: Is a company specializing in the military, police, and civilian markets. This company also works with Airbus Helicopters for the Southeast Asia market. PT Dirgantara Indonesia also produces fixed-wing aircraft. In Japan the three main manufacturers of helicopters are the aviation arms of the Japanese conglomerates Mitsubishi , Kawasaki and Subaru Corporation . These companies initially followed
1520-429: Is a cylindrical metal shaft that extends upwards from the transmission. At the top of the mast is the attachment point for the rotor blades called the hub. Main rotor systems are classified according to how the rotor blades are attached and move relative to the hub. There are three basic types: hingeless, fully articulated, and teetering; although some modern rotor systems use a combination of these. Most helicopters have
1600-452: Is a type of rotorcraft in which lift and thrust are supplied by one or more horizontally-spinning rotors. By contrast the autogyro (or gyroplane) and gyrodyne have a free-spinning rotor for all or part of the flight envelope, relying on a separate thrust system to propel the craft forwards, so that the airflow sets the rotor spinning to provide lift. The compound helicopter also has a separate thrust system, but continues to supply power to
1680-547: Is an Argentinian ultralight helicopter manufacturer. Helibras or Helicópteros do Brasil S.A. (Helicopters of Brazil, Inc.) is wholly owned subsidiary of Europe's Airbus Helicopters for the South American market. Harbin Aircraft Industry Group , a subsidiary of AVIC , is China 's major helicopter manufacturer. The major western European companies in the industry are Airbus Helicopters ,
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#17327833645161760-528: Is an example of the first type and Kawasaki Heavy Industries , who license-produced Boeing Vertol designs for much of its recent history, is an example of the second type. The peace dividend at the end of the Cold War and the increased cost of developing new helicopters has seen a consolidation of arms manufacturers, and helicopter manufacturers are no exception, with even great names such as Aérospatiale disappearing. With too many manufacturers chasing
1840-452: Is called an aerial crane . Aerial cranes are used to place heavy equipment, like radio transmission towers and large air conditioning units, on the tops of tall buildings, or when an item must be raised up in a remote area, such as a radio tower raised on the top of a hill or mountain. Helicopters are used as aerial cranes in the logging industry to lift trees out of terrain where vehicles cannot travel and where environmental concerns prohibit
1920-547: Is equipped to stabilize and provide limited medical treatment to a patient while in flight. The use of helicopters as air ambulances is often referred to as " MEDEVAC ", and patients are referred to as being "airlifted", or "medevaced". This use was pioneered in the Korean War , when time to reach a medical facility was reduced to three hours from the eight hours needed in World War II , and further reduced to two hours by
2000-498: Is something the US government is especially loath to do. The selection of a foreign helicopter for the new Presidential helicopter being seen by some as unpatriotic. This is a problem facing the US defense industry as a whole. There is the very real possibility that defense contractors with failing bids will leave segments of the industry for good, leaving an ever smaller pool of qualified contractors. One possible solution would be to use
2080-678: Is the Sud-Ouest Djinn , and an example of the hot tip jet helicopter is the YH-32 Hornet . Some radio-controlled helicopters and smaller, helicopter-type unmanned aerial vehicles , use electric motors or motorcycle engines. Radio-controlled helicopters may also have piston engines that use fuels other than gasoline, such as nitromethane . Some turbine engines commonly used in helicopters can also use biodiesel instead of jet fuel. There are also human-powered helicopters . A helicopter has four flight control inputs. These are
2160-411: Is to control forward and back, right and left. The collective is used to maintain altitude. The pedals are used to control nose direction or heading . It is the interaction of these controls that makes hovering so difficult, since an adjustment in any one control requires an adjustment of the other two, creating a cycle of constant correction. As a helicopter moves from hover to forward flight it enters
2240-572: The Bell 205 and the Erickson S-64 Aircrane helitanker. Helicopters are used as air ambulances for emergency medical assistance in situations when an ambulance cannot easily or quickly reach the scene, or cannot transport the patient to a medical facility in time. Helicopters are also used when patients need to be transported between medical facilities and air transportation is the most practical method. An air ambulance helicopter
2320-588: The Bell 206 with 3,400. Most were in North America with 34.3% then in Europe with 28.0% followed by Asia-Pacific with 18.6%, Latin America with 11.6%, Africa with 5.3% and Middle East with 1.7%. The earliest references for vertical flight came from China. Since around 400 BC, Chinese children have played with bamboo flying toys (or Chinese top). This bamboo-copter is spun by rolling a stick attached to
2400-527: The Cornu helicopter which used two 6.1-metre (20 ft) counter-rotating rotors driven by a 24 hp (18 kW) Antoinette engine. On 13 November 1907, it lifted its inventor to 0.3 metres (1 ft) and remained aloft for 20 seconds. Even though this flight did not surpass the flight of the Gyroplane No. 1, it was reported to be the first truly free flight with a pilot. Cornu's helicopter completed
2480-499: The Vietnam War . In naval service a prime function of rescue helicopters is to promptly retrieve downed aircrew involved in crashes occurring upon launch or recovery aboard aircraft carriers. In past years this function was performed by destroyers escorting the carrier, but since then helicopters have proved vastly more effective. Police departments and other law enforcement agencies use helicopters to pursue suspects and patrol
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2560-595: The BA609 civil tiltrotor aircraft from 25 per cent to 40 per cent. In June 2008, AgustaWestland and the Russia-based helicopter manufacturer Russian Helicopters agreed to form a new joint venture company to assemble AW139 helicopters in Russia. Construction of a $ 50 million helicopter assembly facility in the town of Tomilino near Moscow began in June 2010. In early 2010, AgustaWestland acquired PZL-Świdnik ,
2640-558: The Bambi bucket, are usually filled by submerging the bucket into lakes, rivers, reservoirs, or portable tanks. Tanks fitted onto helicopters are filled from a hose while the helicopter is on the ground or water is siphoned from lakes or reservoirs through a hanging snorkel as the helicopter hovers over the water source. Helitack helicopters are also used to deliver firefighters, who rappel down to inaccessible areas, and to resupply firefighters. Common firefighting helicopters include variants of
2720-762: The Chinese top in a model consisting of contrarotating turkey flight feathers as rotor blades, and in 1784, demonstrated it to the French Academy of Sciences . Sir George Cayley , influenced by a childhood fascination with the Chinese flying top, developed a model of feathers, similar to that of Launoy and Bienvenu, but powered by rubber bands. By the end of the century, he had progressed to using sheets of tin for rotor blades and springs for power. His writings on his experiments and models would become influential on future aviation pioneers. Alphonse Pénaud would later develop coaxial rotor model helicopter toys in 1870, also powered by rubber bands. One of these toys, given as
2800-478: The Chinese toy. It was not until the early 1480s, when Italian polymath Leonardo da Vinci created a design for a machine that could be described as an " aerial screw ", that any recorded advancement was made towards vertical flight. His notes suggested that he built small flying models, but there were no indications for any provision to stop the rotor from making the craft rotate. As scientific knowledge increased and became more accepted, people continued to pursue
2880-453: The Gyroplane No. 1 lifted its pilot into the air about 0.6 metres (2 ft) for a minute. The Gyroplane No. 1 proved to be extremely unsteady and required a man at each corner of the airframe to hold it steady. For this reason, the flights of the Gyroplane No. 1 are considered to be the first manned flight of a helicopter, but not a free or untethered flight. That same year, fellow French inventor Paul Cornu designed and built
2960-571: The Martian atmosphere is 100 times thinner than Earth's, its two blades spin at close to 3,000 revolutions a minute, approximately 10 times faster than that of a terrestrial helicopter. In 2017, 926 civil helicopters were shipped for $ 3.68 billion, led by Airbus Helicopters with $ 1.87 billion for 369 rotorcraft, Leonardo Helicopters with $ 806 million for 102 (first three-quarters only), Bell Helicopter with $ 696 million for 132, then Robinson Helicopter with $ 161 million for 305. By October 2018,
3040-727: The West would have been carried out by much smaller OH-58 Kiowa -sized helicopters. Although light helicopter designs had been produced by Mil and Kamov, there was no longer a system by which the manufacturing complexes could be forced to retool to produce these designs. There was also a damaging conflict of interest between the manufacturing complexes and Rosoboronexport , with both Ulan-Ude Aviation Plant and Kazan Helicopter Plant competing to undercut official Rosoboronexport prices, by exporting helicopters destined for military users as civilian in purpose. Kamov , Mil and Rostvertol eventually merged to form Russian Helicopters in 2007. In
3120-550: The aircraft's handling properties under low airspeed conditions—it has proved advantageous to conduct tasks that were previously not possible with other aircraft, or were time- or work-intensive to accomplish on the ground. Today, helicopter uses include transportation of people and cargo, military uses, construction, firefighting, search and rescue , tourism , medical transport, law enforcement, agriculture, news and media , and aerial observation , among others. A helicopter used to carry loads connected to long cables or slings
3200-466: The aviation industry; and the turboshaft engine for helicopter use, pioneered in December 1951 by the aforementioned Kaman K-225, finally gave helicopters an engine with a large amount of power and a low weight penalty. Turboshafts are also more reliable than piston engines, especially when producing the sustained high levels of power required by a helicopter. The turboshaft engine was able to be scaled to
3280-435: The blades angle forwards or backwards, or left and right, to make the helicopter move in those directions. The anti-torque pedals are located in the same position as the rudder pedals in a fixed-wing aircraft, and serve a similar purpose, namely to control the direction in which the nose of the aircraft is pointed. Application of the pedal in a given direction changes the pitch of the tail rotor blades, increasing or reducing
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3360-677: The building of roads. These operations are referred to as longline because of the long, single sling line used to carry the load. In military service helicopters are often useful for delivery of outsized slung loads that would not fit inside ordinary cargo aircraft: artillery pieces, large machinery (field radars, communications gear, electrical generators), or pallets of bulk cargo. In military operations these payloads are often delivered to remote locations made inaccessible by mountainous or riverine terrain, or naval vessels at sea. In electronic news gathering , helicopters have provided aerial views of some major news stories, and have been doing so, from
3440-406: The cockpit from overhead. The control is called the cyclic because it changes cyclic pitch of the main blades. The result is to tilt the rotor disk in a particular direction, resulting in the helicopter moving in that direction. If the pilot pushes the cyclic forward, the rotor disk tilts forward, and the rotor produces a thrust in the forward direction. If the pilot pushes the cyclic to the side,
3520-535: The company, the aircraft "employs no hydraulics, doesn't burn fossil fuel and generates zero emissions." India signed a contract to purchase 12 AgustaWestland AW101 helicopters in February 2010 for the Communication Squadron of Indian Air Force to carry the president, PM and other VVIPs. The contract was frozen in February 2013 after allegations surfaced that US$ 60 million had been paid as
3600-797: The configuration of a single main rotor accompanied by a vertical anti-torque tail rotor (i.e. unicopter , not to be confused with the single-blade monocopter ) has become the most common helicopter configuration. However, twin-rotor helicopters (bicopters), in either tandem or transverse rotors configurations, are sometimes in use due to their greater payload capacity than the monorotor design, and coaxial-rotor , tiltrotor and compound helicopters are also all flying today. Four-rotor helicopters ( quadcopters ) were pioneered as early as 1907 in France, and along with other types of multicopters , have been developed mainly for specialized applications such as commercial unmanned aerial vehicles (drones) due to
3680-470: The cyclic, the collective, the anti-torque pedals, and the throttle. The cyclic control is usually located between the pilot's legs and is commonly called the cyclic stick or just cyclic . On most helicopters, the cyclic is similar to a joystick. However, the Robinson R22 and Robinson R44 have a unique teetering bar cyclic control system and a few helicopters have a cyclic control that descends into
3760-410: The design are growing, there is still the danger that not enough helicopters will be sold to be able to maintain the teams needed for the continuous development of the design to keep it competitive over the next twenty to thirty years, and to eventually develop its replacement. The sporadic nature of defense procurement is also unattractive to companies wishing to maintain a constant income stream. While
3840-606: The design of helicopters. After a winning design had been chosen it was assigned to large manufacturing complexes responsible only for production. For example, both the Ulan-Ude Aviation Plant and the Kazan Helicopter Plant were responsible for the production of helicopters derived from the Mil Mi-8 family. The products of these factories were then exported through state export corporations,
3920-439: The event was taken by Max Skladanowsky , but it remains lost . In 1885, Thomas Edison was given US$ 1,000 (equivalent to $ 34,000 today) by James Gordon Bennett, Jr. , to conduct experiments towards developing flight. Edison built a helicopter and used the paper for a stock ticker to create guncotton , with which he attempted to power an internal combustion engine. The helicopter was damaged by explosions and one of his workers
4000-571: The experience they have built up as licensees and sub-contractors the Japanese companies are beginning to produce and offer their own products. A 2006 re-organisation of the helicopter industry in Russia created Oboronprom ( Russian Helicopters ) a holding company to bring together Mil and manufacturing plants. In the Soviet- planned economic system, the Mil and Kamov OKBs were responsible only for
4080-486: The first half of the 20th century was that the amount of power produced by an engine was not able to overcome the engine's weight in vertical flight. This was overcome in early successful helicopters by using the smallest engines available. When the compact, flat engine was developed, the helicopter industry found a lighter-weight powerplant easily adapted to small helicopters, although radial engines continued to be used for larger helicopters. Turbine engines revolutionized
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#17327833645164160-574: The helicopter to take off and land vertically , to hover , and to fly forward, backward and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of short take-off and landing ( STOL ) or short take-off and vertical landing ( STOVL ) aircraft cannot perform without a runway . In 1942, the Sikorsky R-4 became the first helicopter to reach full-scale production . Although most earlier designs used more than one main rotor,
4240-459: The high operating cost of helicopters cost-effective in ensuring that oil platforms continue to operate. Various companies specialize in this type of operation. NASA developed Ingenuity , a 1.8 kg (4.0 lb) helicopter used to survey Mars (along with a rover). It began service in February 2021 and was retired due to sustained rotor blade damage in January 2024 after 73 sorties. As
4320-480: The idea of vertical flight. In July 1754, Russian Mikhail Lomonosov had developed a small coaxial modeled after the Chinese top but powered by a wound-up spring device and demonstrated it to the Russian Academy of Sciences . It was powered by a spring, and was suggested as a method to lift meteorological instruments. In 1783, Christian de Launoy , and his mechanic , Bienvenu, used a coaxial version of
4400-504: The in-service and stored helicopter fleet of 38,570 with civil or government operators was led Robinson Helicopter with 24.7% followed by Airbus Helicopters with 24.4%, then Bell with 20.5 and Leonardo with 8.4%, Russian Helicopters with 7.7%, Sikorsky Aircraft with 7.2%, MD Helicopters with 3.4% and other with 2.2%. The most widespread model is the piston Robinson R44 with 5,600, then the H125/ AS350 with 3,600 units, followed by
4480-662: The lack of an airstrip would make transport via fixed-wing aircraft impossible. The use of transport helicopters to deliver troops as an attack force on an objective is referred to as " air assault ". Unmanned aerial systems (UAS) helicopter systems of varying sizes are developed by companies for military reconnaissance and surveillance duties. Naval forces also use helicopters equipped with dipping sonar for anti-submarine warfare , since they can operate from small ships. Oil companies charter helicopters to move workers and parts quickly to remote drilling sites located at sea or in remote locations. The speed advantage over boats makes
4560-581: The late 1960s. Helicopters have also been used in films, both in front and behind the camera. The largest single non-combat helicopter operation in history was the disaster management operation following the 1986 Chernobyl nuclear disaster . Hundreds of pilots were involved in airdrop and observation missions, making dozens of sorties a day for several months. " Helitack " is the use of helicopters to combat wildland fires . The helicopters are used for aerial firefighting (water bombing) and may be fitted with tanks or carry helibuckets . Helibuckets, such as
4640-555: The limited power did not allow for manned flight. The introduction of the internal combustion engine at the end of the 19th century became the watershed for helicopter development as engines began to be developed and produced that were powerful enough to allow for helicopters able to lift humans. Early helicopter designs utilized custom-built engines or rotary engines designed for airplanes, but these were soon replaced by more powerful automobile engines and radial engines . The single, most-limiting factor of helicopter development during
4720-546: The marketplace. Even when consolidation is inevitable, governments and politicians have sought to play matchmaker, as seen in the Westland affair . In the United States, in addition to the concern of maintaining national champions, there is also the fear of a loss of competition in the domestic market, creating a situation where designs and prices become uncompetitive. Increasing competition by considering foreign designs
4800-760: The merger in July 2000, which included a 50-50 ownership structure, and the payment of top-up fees to GKN to compensate for a disparity in profit levels between Agusta and Westland. In January 2002, AgustaWestland announced that it would be cutting a total of 950 jobs in the United Kingdom and closing its factory in Weston-super-Mare , which carried out customer support work, as activity was concentrated at its main site in Yeovil . On 26 May 2004, GKN confirmed that it had agreed to sell its share of AgustaWestland to Finmeccanica for £1.06 billion. The sale
4880-601: The nearby park, the Parco Forlanini. Emmanuel Dieuaide's steam-powered design featured counter-rotating rotors powered through a hose from a boiler on the ground. In 1887 Parisian inventor, Gustave Trouvé , built and flew a tethered electric model helicopter. In July 1901, the maiden flight of Hermann Ganswindt 's helicopter took place in Berlin-Schöneberg; this was probably the first heavier-than-air motor-driven flight carrying humans. A movie covering
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#17327833645164960-464: The nose to pitch down, with a resultant increase in airspeed and loss of altitude. Aft cyclic will cause the nose to pitch up, slowing the helicopter and causing it to climb. Increasing collective (power) while maintaining a constant airspeed will induce a climb while decreasing collective will cause a descent. Coordinating these two inputs, down collective plus aft cyclic or up collective plus forward cyclic, will result in airspeed changes while maintaining
5040-411: The power normally required to be diverted for the tail rotor to be applied fully to the main rotors, increasing the aircraft's power efficiency and lifting capacity. There are several common configurations that use the counter-rotating effect to benefit the rotorcraft: Tip jet designs let the rotor push itself through the air and avoid generating torque. The number, size and type of engine(s) used on
5120-405: The predecessors of the present Rosoboronexport . With the dissolution of the Soviet Union , the helicopter industry in Russia became fragmented. For example, PZL, in the former Soviet satellite state of Poland, was tasked with the production of light helicopters. As a result, there was no production of light helicopters in Russia and the Mil Mi-8 family of helicopters was used for tasks which in
5200-612: The rapid expansion of drone racing and aerial photography markets in the early 21st century, as well as recently weaponized utilities such as artillery spotting , aerial bombing and suicide attacks . The English word helicopter is adapted from the French word hélicoptère , coined by Gustave Ponton d'Amécourt in 1861, which originates from the Greek helix ( ἕλιξ ), genitive helikos (ἕλῐκος), "helix, spiral, whirl, convolution" and pteron ( πτερόν ) "wing". In
5280-436: The rotor disk tilts to that side and produces thrust in that direction, causing the helicopter to hover sideways. The collective pitch control or collective is located on the left side of the pilot's seat with a settable friction control to prevent inadvertent movement. The collective changes the pitch angle of all the main rotor blades collectively (i.e. all at the same time) and independently of their position. Therefore, if
5360-406: The rotor in cruise, which allows its rotation to be slowed down , thus increasing the maximum speed of the aircraft. The Lockheed AH-56A Cheyenne diverted up to 90% of its engine power to a pusher propeller during forward flight. There are three basic flight conditions for a helicopter: hover, forward flight and the transition between the two. Hovering is the most challenging part of flying
5440-422: The rotor throughout normal flight. The rotor system, or more simply rotor , is the rotating part of a helicopter that generates lift . A rotor system may be mounted horizontally, as main rotors are, providing lift vertically, or it may be mounted vertically, such as a tail rotor, to provide horizontal thrust to counteract torque from the main rotors. The rotor consists of a mast, hub and rotor blades. The mast
5520-494: The same contracts, and the removal of government subsidies, it was impossible for individual manufacturers to absorb the costs of bringing a design to maturity that subsequently failed commercially. For example, the AgustaWestland EH101 , which will be a mainstay of the newly merged AgustaWestland company for the foreseeable future, had, and to an extent still has, the ability to break its parents. Although sales of
5600-418: The size of the helicopter being designed, so that all but the lightest of helicopter models are powered by turbine engines today. Special jet engines developed to drive the rotor from the rotor tips are referred to as tip jets . Tip jets powered by a remote compressor are referred to as cold tip jets, while those powered by combustion exhaust are referred to as hot tip jets. An example of a cold jet helicopter
5680-483: The skies. Since helicopters can achieve a unique aerial view, they are often used in conjunction with police on the ground to report on suspects' locations and movements. They are often mounted with lighting and heat-sensing equipment for night pursuits. Military forces use attack helicopters to conduct aerial attacks on ground targets. Such helicopters are mounted with missile launchers and miniguns . Transport helicopters are used to ferry troops and supplies where
5760-479: The tail rotor, such as the ducted fan (called Fenestron or FANTAIL ) and NOTAR . NOTAR provides anti-torque similar to the way a wing develops lift through the use of the Coandă effect on the tail boom. The use of two or more horizontal rotors turning in opposite directions is another configuration used to counteract the effects of torque on the aircraft without relying on an anti-torque tail rotor. This allows
5840-448: The throttle is to maintain enough engine power to keep the rotor RPM within allowable limits so that the rotor produces enough lift for flight. In single-engine helicopters, the throttle control is a motorcycle-style twist grip mounted on the collective control, while dual-engine helicopters have a power lever for each engine. A compound helicopter has an additional system for thrust and, typically, small stub fixed wings . This offloads
5920-417: The thrust produced by the tail rotor and causing the nose to yaw in the direction of the applied pedal. The pedals mechanically change the pitch of the tail rotor altering the amount of thrust produced. Helicopter rotors are designed to operate in a narrow range of RPM . The throttle controls the power produced by the engine, which is connected to the rotor by a fixed ratio transmission. The purpose of
6000-488: The upkeep of a work force and industrial infrastructure is expensive without a full work load, companies that have reduced capacity have lost work for fear that they would not be able to meet production targets. Consolidation is seen as a way of both limiting the number of competing designs and increasing the financial strength of companies. However, helicopter manufacturing is seen as a strategic industry, and some governments have sought to protect their national champions from
6080-572: The vertical flight he had envisioned. Steam power was popular with other inventors as well. In 1877, the Italian engineer, inventor and aeronautical pioneer Enrico Forlanini developed an unmanned helicopter powered by a steam engine . It rose to a height of 13 meters (43 feet), where it remained for 20 seconds, after a vertical take-off from a park in Milan . Milan has dedicated its city airport to Enrico Forlanini, also named Linate Airport , as well as
6160-866: The world's largest helicopter manufacturer, and Leonardo Helicopters (former AgustaWestland ), representing the second largest. As of 2020, the two firms hold respectively 48% and 20% of the worldwide helicopter manufacturing market share. In India, the Hindustan Aeronautics Limited is the main helicopter manufacturer for the Indian Armed Forces , Indian Coast Guard . It is the only major manufacturer in South Asia that designs and manufactures both military utility and attack helicopters and also their civilian models. PT Dirgantara Indonesia ( Indonesia Aerospace in English)
6240-690: Was approved by the British government in October 2004. AgustaWestland opened offices in Philadelphia in 2005 and won a contract to build the new presidential helicopter Marine One over the U.S. manufacturer Sikorsky Aircraft , but this program was cancelled in 2009. In November 2005, it was announced that AgustaWestland had agreed to acquire Bell Helicopter 's 25 per cent interest in the AB139 medium twin helicopter program, and to increase its interest in
6320-486: Was badly burned. Edison reported that it would take a motor with a ratio of three to four pounds per horsepower produced to be successful, based on his experiments. Ján Bahýľ , a Slovak inventor, adapted the internal combustion engine to power his helicopter model that reached a height of 0.5 meters (1.6 feet) in 1901. On 5 May 1905, his helicopter reached 4 meters (13 feet) in altitude and flew for over 1,500 meters (4,900 feet). In 1908, Edison patented his own design for
6400-752: Was merged into Leonardo S.p.A. (formerly Finmeccanica), where it became the company's helicopters division under the Leonardo Helicopters brand. The collaboration between Agusta and Westland dates back to 1981, when the two companies established the European Helicopter Industries joint venture with the aim of developing a new medium-size utility helicopter , the EH101 . In March 1999, Finmeccanica and GKN announced their intention to merge their respective helicopter subsidiaries. The two parties announced finalised terms for
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