The Allison T56 turboprop engine has been developed extensively throughout its production run, the many variants are described by the manufacturer as belonging to four main series groups.
66-583: Initial civil variants (Series I) were designed and produced by the Allison Engine Company as the 501-D and powered the Lockheed C-130 Hercules . Later variants (Series II, III, 3,5 and IV) gave increased performance through design refinements. Further derivatives of the 501-D/T56 were produced as turboshafts for helicopters including a variant with a United States military aircraft engine designation of T701 , which
132-536: A market capitalisation of £ 4.656bn, the 85th-largest of any company with a primary listing on the London Stock Exchange. The company's registered office is at Kings Place , near Kings Cross in London . Rolls-Royce grew from the engineering business of Henry Royce , which was established in 1884 and ten years later began to manufacture dynamos and electric cranes. Charles Rolls established
198-599: A "family aircraft". Before work on this design had progressed very far, Fisher sold the company to General Motors, which ended development owing to financial pressures of the Great Depression . Nevertheless, Gilman pressed ahead with the cylinder design, building a "paper project" V-12 engine. The Army was once again uninterested, but instead suggested Allison try selling it to the United States Navy . The Navy agreed to fund development of A and B models to
264-481: A $ 100 million contract to provide gas turbines for oil platforms. In October 2016 a joint Guardian and BBC investigation alleged widespread corruption by Rolls-Royce through middlemen in foreign countries including Brazil, India, China, Indonesia, South Africa, Angola, Iraq, Iran, Kazakhstan, Azerbaijan, Nigeria and Saudi Arabia. Rolls-Royce became subject to a major SFO investigation. In 2013 media reported allegations from two American ex-employees that thousands of
330-400: A $ 4.2 billion public tender offer for 100 per cent of the share capital of Tognum AG , the owner of MTU Friedrichshafen – a leading high-speed industrial and marine diesel engine manufacturer, which was completed using a 50:50 joint venture company. Rolls-Royce and Daimler AG intend that the joint venture company, which also now incorporates Rolls-Royce's existing Bergen engine business,
396-412: A 100% owned subsidiary of Rolls-Royce plc. Optimized Systems and Solutions Limited (formerly known as Data Systems & Solutions) was founded in 1999 as a joint venture between Rolls-Royce plc and Science Applications International Corporation (SAIC). In early 2006, SAIC exited the joint venture agreement, making Rolls-Royce plc the sole owner. In March 2011, Rolls-Royce and Daimler AG launched
462-738: A 49 by 49 ft (15 by 15 m) tall and wide enclosed space and it can handle a 66 tons engine including its carrier. The company completed its first engine run on the new test bed in July 2024. X-ray imaging allows to visualize the position of seals and clearances in real time while an engine is running. While it was retrofitted on Rolls' test bed 57, test bed 80 is the first to be purpose-designed for industrial radiography . To protect from external X-ray, 30 cm (11.8 in.) of lead , double walls are up to 8.9 ft. (2.7 m) thick (a 5.6-ft. interior wall and 3.3-ft. exterior wall) and provide acoustic insulation. Canadian prime contractor MDS Aero Support
528-544: A LiftFan nozzle was tested in 1997 at NASA's Lewis facility. By 1997, a complete prototype had been demonstrated by the Rolls-Royce owned but American-controlled Allison Advanced Development Company. In 1965 a drag racer, Jim Lytle, created a car known as Quad Al which incorporated four World War II surplus V-12 Allison aero-engines in a four-wheel drive configuration, and developing approximately 12,000 hp (8,900 kW). Although its engines started, it never ran;
594-416: A division of General Motors . The company's only regular production item was a patented steel-backed lead bearing, which was used in various high performance engines. It also built various drive shafts, extensions and gear chains for high power engines, on demand. Later its main business was the conversion of older Liberty engines to more powerful models, both for aircraft and marine use. Allison needed
660-522: A place where his race car engines could be modified and repaired. On January 1, 1917 Allison moved into a building at what was to become, in later years, the Indianapolis Motor Speedway . Along with the move, Allison hired Norman H. Gillman, a very talented engineer from a competing race team, as his chief engineer. Allison moved to Florida to invest in real estate after World War I, leaving Gillman in charge. Allison did not want
726-419: A separate business with Royce in 1904 because Royce had developed a range of cars which Rolls wanted to sell. A corporate owner was incorporated in 1906 with the name Rolls-Royce Limited . In 1971 the same company, Rolls-Royce Limited, entered voluntary liquidation because it was unable to meet its financial obligations. It remains in existence today, still in liquidation. Its business and assets were bought by
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#1732780823409792-483: A technical association dating back to the Second World War. Rolls-Royce had previously tried to buy the company when General Motors sold it in 1993, but GM opted for a management buyout instead for $ 370 million. Owing to Allison's involvement in classified and export restricted technology, the 1994 acquisition was subject to investigation to determine the national security implications. On 27 March 1995,
858-647: A very limited degree for its airships , until the crash of the USS Macon in 1935, when the Navy's need for a 1,000 hp (750 kW) engine disappeared. The very first V-1710 was purchased by the U.S. Navy as their GV-1710-2, and appears to have had an Allison serial of number 1, suggesting that they restarted numbering for the V-1710. The first V-1710 engine purchased by the USAAC was AAC 33-42, Allison Serial No. 2,
924-707: A £671 million penalty to settle bribery and corruption charges with the Serious Fraud Office (SFO), the US Department of Justice, and Brazilian authorities. On 14 June 2018 the company announced a restructuring of the business to create three simpler decentralised units ( civil aerospace , defence and power systems ), to rationalise back office functions and to remove middle management functions. The cost savings should amount to £400 million per year by 2020, with an up-front restructuring cost of £500 million. Some 4,600 people are likely to leave
990-493: Is a British multinational aerospace and defence company incorporated in February 2011. The company owns Rolls-Royce, a business established in 1904 which today designs, manufactures and distributes power systems for aviation and other industries. Rolls-Royce is the world's second-largest maker of aircraft engines (after CFM International ) and has major businesses in the marine propulsion and energy sectors . Rolls-Royce
1056-532: Is listed on the Frankfurt Stock Exchange . Following the acquisition of Goodrich by United Technologies Corporation in July 2012, Rolls-Royce announced it would purchase Goodrich's 50% share of Aero Engine Controls to become wholly owned by Rolls-Royce. At the June 2019 Paris Air Show , Rolls-Royce announced its acquisition of Siemens' electric propulsion branch (while they are partners on
1122-609: Is now Vinters Engineering Limited. Rolls-Royce sold Vickers Defence Systems (the other major Vickers area of business) to Alvis plc in 2002. Rolls-Royce has established a leading position in the corporate and regional airline sector through the development of the Tay engine, the Allison acquisition and the consolidation of the BMW Rolls-Royce joint venture. In 1999, BMW Rolls-Royce was renamed Rolls-Royce Deutschland and became
1188-613: Is responsible for design and management, test systems supply, engine adapters, support systems and data acquisition and control while construction is done by Buckingham Group Contracting. In 1988, Rolls-Royce acquired Northern Engineering Industries (NEI), based in the North East of England , a group of heavy engineering companies mainly associated with electrical generation and power management. The group included Clarke Chapman (cranes), Reyrolle (now part of Siemens ) and Parsons (now part of Siemens steam turbines ). The company
1254-474: Is the largest of its kind, sized for engines of up to 140,000 lbf (620 kN) of thrust. Design started in 2017, construction began in 2018 and it should be commissioned by mid-2020. The 80,730 sq ft (7,500 m ) facility is 426.5 ft (130.0 m) long, has a 95 ft (29 m) tall intake tower and a 123 ft (37 m) tall exhaust stack. Built from 3,450 tons of steel and 27,000 m (950,000 cu ft) of concrete, it has
1320-587: The 578-DX propfan . Unlike the competing General Electric GE-36 UDF , the 578-DX was fairly conventional, having a reduction gearbox between the LP turbine and the propfan blades. Noise considerations, plus a significant reduction in the real cost of aviation fuel, brought the NASA funded program to a halt. In 1995, Allison tested a prototype lift fan for the Joint Strike Fighter Program and
1386-525: The Allison GT 404-4 turboshaft engine intended for trucks. Allison continued to work with General Motors on development of ceramic- turbine powered engines until the early 1990s. During their work they were able to engineer fairly stable automobile engines that were capable of burning a variety of fuels, such as gasoline, Diesel, kerosene, alcohol, vegetable oil, and coal powder. In the 1980s Allison collaborated with Pratt & Whitney on demonstrating
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#17327808234091452-618: The Allison J35 . The J35 was the primary powerplant for the F-84 Thunderjet and F-89 Scorpion , as well as appearing on numerous prototype designs. The J35 also finished production in 1955, by which point over 14,000 had been delivered. Allison also began development of a series of turboprop engines for the U.S. Navy, starting with the T38 and a "twinned" version as the T40 . The Navy
1518-654: The COVID-19 pandemic . Around 3,000 job losses were expected in the UK, half of them in Derby. In February 2021, Rolls-Royce started talks concerning an operational shutdown of its civil aerospace unit that might last for two weeks due to the impact of Covid-19 and its restrictions. Rolls-Royce announced, in October 2023, that it would cut 2,500 jobs, or 6 per cent of its total workforce. Rolls-Royce's £90 million test bed 80
1584-596: The Convair 580 turboprop passenger aircraft which was widely used by local service and regional airlines in the U.S. such as Allegheny Airlines , the original Frontier Airlines , North Central Airlines , as well as major carriers American , Eastern , United , and Pan-Am . Over the years a family of engines based on the T56 configuration was developed, culminating in the T406/ Allison AE1107 turboshaft for
1650-555: The E-Fan X demonstrator), to be completed in late 2019, employing 180 in Germany and Hungary. In May 2014, Rolls-Royce sold its energy gas turbine and compressor business to Siemens for £785 million. In July 2018, Rolls-Royce sold its commercial marine business to Kongsberg for £500 million. In September 2019, Rolls-Royce agreed to sell its civil nuclear services businesses in the U.S., Canada, Mondragon France, and Gateshead UK to
1716-960: The Indianapolis Motor Speedway in Indianapolis . James Allison was the owner of the Indianapolis Speedway Team Company , a race car business in Indianapolis, Indiana. While it was founded as the Indianapolis Speedway Team Company, its name changed numerous times, first to the Allison Speedway Team Company, then the Allison Experimental Company and last as the Allison Engineering Company before becoming
1782-544: The Rolls-Royce LiftSystem invented by Lockheed Martin for the F-35 Lightning II to production level; The F-35 is planned to be produced in significant numbers. At the 2005 Paris Air Show , Rolls-Royce secured in excess of $ 1 billion worth of orders. The firm received $ 800m worth of orders from Air China to supply its 20 Airbus A330 jets. On 18 June 2007, Rolls-Royce announced at
1848-707: The Trent 1000 for the revised Airbus A350XWB jetliner. As of July 2015, over 1,500 engines of this type have been supplied to 40 customers. On the military side, Rolls-Royce, in co-operation with other European manufacturers, has been a major contractor for the RB199 which in several variants powers the Panavia Tornado , and also for the EJ200 engine for the Eurofighter Typhoon . Rolls-Royce has matured
1914-790: The V-22 Osprey , the Allison AE2100 turboprop, used on newer models of the C-130 and the Allison/ Rolls-Royce AE 3007 turbofan which propels many regional airline aircraft, such as the Embraer ERJ 135 , ERJ 140 and ERJ 145 family of regional passenger jets that continue to be widely used in the airline industry. One of Allison's most successful projects is the Model 250 turboshaft/turboprop engine family, which
1980-677: The Westinghouse Electric Company for an undisclosed sum. These businesses had a revenue of $ 70 million and about 500 employees in 2018. Rolls-Royce is keeping its nuclear new build and small modular reactor (SMR) business in the UK. In November 2020, the company announced plans to build up to 16 Rolls-Royce SMR nuclear plants across the UK, continuing its nuclear division operations. In December 2020 Rolls-Royce announced it would sell other foreign parts of its civil nuclear instrumentation and control business to Framatome as part of its post-COVID recovery plan, completing
2046-547: The 2007 Paris Air Show that it had signed a large contract with Qatar Airways for the Trent XWB to power 80 A350s on order from Airbus worth $ 5.6 billion at list prices. On 11 November 2007, Rolls-Royce announced at the Dubai Airshow that it had signed its largest ever contract with Emirates for Trent XWBs to power 50 A350-900 and 20 A350-1000 aircraft with 50 option rights. Due to be delivered from 2014,
Allison T56 variants - Misplaced Pages Continue
2112-523: The US Department of Defense announced that the "deal between Allison Engine Co. and Rolls-Royce does not endanger national security." Rolls-Royce was, however, obliged to set up a proxy board to manage Allison and had also to set up a separate company, Allison Advanced Development Company, Inc. , to manage classified programmes "that involve leading-edge technologies" such as the Joint Strike Fighter programme . In 2000, this restriction
2178-593: The XV-1710-1, while Serial Nos. 3, 4, 5 were V-1710-4 engines for U.S. Navy airships, followed by a batch of 11 Air Corps engines purchased with FY-1934 funds (34-4 through 34-14) that covered Allison serials 6 through 16. After these the production race was on, totaling over 70,000 V-1710s. By this time the Army had become more interested in the design, and asked Allison to continue with a new "C" model. They had few funds of their own to invest, and Allison supported much of
2244-716: The acetylene gas works in downtown Indianapolis caused the company to relocate out of town, near the race track in Speedway, Indiana . Allison and Fisher raced automobiles at that track, each owning a race car team. This hobby resulted in Allison building a shop at the track in Speedway where he maintained his fleet of race cars. This shop became the site for Allison Plant #1. Fisher and Allison sold their interest in Prest-O-Lite to Union Carbide for $ 9,000,000. Allison started as an engine and car "hot rodding" company servicing
2310-542: The business out of 55,000 employed worldwide, 3,000 job losses from the UK and the rest from elsewhere in the world (15,700 of the employees work in Derby and 10,300 work elsewhere in the United Kingdom). In August 2018 Rolls-Royce announced it was taking a charge of £554 million to cover faults with some Trent 1000 engines on Boeing 787 Dreamliners . Rather than going thousands of hours between inspections,
2376-467: The company to wither, so he asked Gillman to build a V-12 marine engine worthy of the Allison name. Gillman then proceeded to build an engine that relied on what was learned from building and modifying the venerable Liberty engine. Allison's company was sold to Captain Eddie Rickenbacker in 1927 for $ 700,000 after Allison moved to Florida. In 1929, shortly after the death of James Allison,
2442-839: The company was purchased by the Fisher brothers . The Fishers sold the company to General Motors , who owned it for most of its history. The Allison Engine Company was acquired in 1995 by Rolls-Royce plc , and became the Rolls-Royce Corporation subsidiary. In the late 1920s the United States Army funded the development of a series of high-power engines, as part of its hyper engine series, which it intended to produce on Continental Motors ' production lines. Allison's manager, Norman Gilman, decided to experiment with his own high-power cylinder design. Allison's engine became Manufacturer Serial No. 1, AAC S/N 25-521. It
2508-507: The company's main area of growth. Between 2010 and 2018, Rolls-Royce invested £11 billion in facilities and R&D and launched six new civil engines including the Trent XWB and the Pearl 15 for the business aviation market. It secured orders for 2,700 engines for wide-body aircraft and business jets . It expects to produce over 600 wide-body engines a year and should power over half of
2574-555: The creator could not afford the custom gearboxes and clutches required to handle the enormous torque generated by the engines. The car survives, without its engines, in Indiana , USA. In 1992 General Motors tried to sell Allison to concentrate on rebuilding automobile market share. Rolls-Royce attempted to buy the company in 1993, but General Motors opted for a management buyout instead for $ 370 million. In 1995 US authorities approved, with restrictions on Joint Strike Fighter Program ,
2640-675: The deal involving over 550 employees in November 2021. In 1996, Rolls-Royce and Airbus signed a memorandum of understanding , specifying the Trent 900 as the engine of choice for the then A3XX, now the Airbus A380 . However, the Engine Alliance GP7000 would ultimately also be offered as an option on the A380. In October 2006, Rolls-Royce suspended production of its Trent 900 engine because of delays by Airbus on
2706-704: The delivery of the A380 superjumbo. Rolls-Royce announced in October 2007 that production of the Trent 900 had been restarted after a twelve-month suspension caused by delays to the A380. In 2011, Rolls-Royce faced scrutiny after high profile incidents involving the Trent 900. One of the engines suffered a partial power loss during a Qantas flight in February 2011. This followed an incident in November 2010 in which an engine disintegrated in flight causing Qantas Flight 32 to make an emergency landing in Singapore. The aircraft
Allison T56 variants - Misplaced Pages Continue
2772-469: The development out of their own pocket. The V-1710-C first flew on 14 December 1936 in the Consolidated A-11 A testbed. The V-1710-C6 completed the Army 150 hour Type Test on 23 April 1937, at 1,000 hp (750 kW), the first engine of any type to do so. By then all of the other Army engine projects had been cancelled or withdrawn, leaving the V-1710 as the only modern design available. It
2838-415: The early stages after the introduction of IFRS 15 in 2018 and its profits for 2015 would have been £900m lower than the £1.4bn it reported if it had followed the new accounting standard . In February 2017 Rolls-Royce posted its largest ever pre-tax loss of £4.6 billion; This included a £4.4 billion writedown on financial hedges that the company uses to protect itself against currency fluctuations, and
2904-569: The end of the war, Allison found itself with a large production infrastructure that was no longer needed. For this reason, in 1947, the Army decided to take General Electric 's versions of Frank Whittle 's jet engines and give them to Allison to produce instead. The main production model was GE's 4,000 lbf (18 kN) I-40, produced as the Allison J33 . By the time production ended in 1955, Allison had produced over 7,000 J33s. Allison also took over GE's axial flow engine design, becoming
2970-405: The faults with turbine blades mean the engines currently require inspection every 300 hours of flight. In the same announcement Rolls-Royce said it would spend £450m fixing faults on the Trent 1000 in 2018, £450m in 2019 and £350m in 2020, with the work complete by 2022. In May 2020, the company announced its intention to cut 20% of its workforce (approximately 9,000 staff) worldwide as a result of
3036-407: The government using a company created for the purpose named Rolls-Royce (1971) Limited. Rolls-Royce Motors was separated out in 1973. Rolls-Royce (1971) Limited currently carries on the business under the name Rolls-Royce plc. Rolls-Royce plc returned to the stock market in 1987 under the government of Margaret Thatcher . In 2003 ownership of Rolls-Royce plc was passed to Rolls-Royce Group plc. In
3102-823: The integration of the reactor design, the PWR3 , for UK's next generation nuclear-armed submarines . In March 2023, Rolls-Royce announced that Rolls-Royce Submarines Limited will provide nuclear reactors for the SSN-AUKUS class of submarines for both the Royal Navy and Royal Australian Navy. To support the SSN-AUKUS programme, Rolls-Royce announced it would double the size of the Rolls-Royce Submarines LTD site in Raynesway, Derby creating 1,170 jobs in
3168-611: The offshore oil and gas market and its civil aerospace business, the company initiated job cuts of over 3,000 in response. Rolls-Royce had been selling many of its aero-engines in combination with long-term service contracts. Even though the company booked profits in part with the delivery of the engine, actual payments only came in over time. Between 2003 and 2015, it sold a majority of its engines with these “TotalCare” contracts. The company announced it would no longer be able to move its revenues forward from its long-term service contracts to compensate for its contracts being unprofitable in
3234-515: The order is potentially worth up to 8.4 billion US Dollars at list prices. On 20 November 2007, Rolls-Royce announced plans to build its first Asian aero engine facility in the Seletar Aerospace Park , Singapore. The $ 562m (£355m) plant complements its existing facility at Derby by concentrating on the assembly and testing of large civil engines, including Trent 1000 and Trent XWB. Productivity will be higher than at Derby, as
3300-482: The plant is fully integrated, as opposed to manufacturing occurring across five sites in the UK: a Trent 900 will take only 14 days to manufacture, as opposed to 20 in the UK. Originally expected to provide employment for 330 people, by the start of production in 2012, 1,600 employees were based in Singapore. In May 2012, Rolls-Royce Marine Power Operations won a Ministry of Defence contract worth more than £400 million for
3366-638: The process Rolls-Royce has been accused numerous times of corrupt practices and bribery . In 2014, facing allegations of bribery in the aftermath of the Sudhir Choudhrie affair, Rolls-Royce offered to return money to the Indian government. The Serious Fraud Office (SFO) also investigated allegations of bribery in Indonesia and China. In February 2015 Rolls-Royce was accused of bribing an employee of Brazil's state-controlled oil company to win
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#17327808234093432-581: The purchase of Allison by Rolls-Royce. The price was $ 525 million. In the year 2000, some of these restrictions were alleviated, and in 2001 the US government chose the F-35 with Rolls-Royce LiftFan and Pratt & Whitney F135 engines. Allison was also a partner with General Electric and Rolls-Royce on the F136 Fighter Engine Team. Rolls-Royce Group PLC Rolls-Royce Holdings plc
3498-506: The same way, Rolls-Royce Group plc passed ownership on 23 May 2011 to Rolls-Royce Holdings plc. Throughout these corporate changes Rolls-Royce plc has remained the principal trading company. The 1980s saw the introduction of a policy to offer an engine fitment on a much wider range of civil aircraft types, with the company's engines now powering 17 different airliners (and their variants) compared to General Electric 's 14 and Pratt & Whitney 's 10. The civil engines business represents
3564-402: The world's wide-body fleet within a few years, up from 22% a decade before. In 2023, Rolls-Royce entered into an agreement for $ 3.52 million of funding with the UK Space Agency for the creation of a nuclear reactor on the moon. The project is intended to provide power for space missions. In 2014 and 2015, Rolls-Royce issued at least four profit warnings due to US defence cuts, a downturn in
3630-451: Was acquired by Rolls-Royce plc in 1995 to become the US subsidiary , Rolls-Royce North America . A predecessor of Allison Engine Company, the Concentrated Acetylene Company , was founded in September 1904 by James Allison, Percy C. "Fred" Avery and Carl G. Fisher . Avery was the holder of the patent for the product. This company was the predecessor of the Prest-O-Lite Company , a manufacturer of acetylene headlights. An explosion at
3696-415: Was announced that Rolls-Royce had received its largest order to date worth £6.1bn ($ 9.2bn) to supply engines for 50 Emirates A380 planes. On 6 April 2004, Boeing announced that it had selected both Rolls-Royce and General Electric to power its new 787. Rolls-Royce submitted the Trent 1000 , a further development of that series. In July 2006, Rolls-Royce reached an agreement to supply a new version of
3762-435: Was developed for the canceled Boeing Vertol XCH-62 project. Related development Comparable engines Related lists Allison Engine Company The Allison Engine Company was an American aircraft engine manufacturer. Shortly after the death of James Allison in 1929 the company was purchased by the Fisher brothers . Fisher sold the company to General Motors , which owned it for most of its history. It
3828-485: Was extensively damaged and the airline grounded its fleet of A380s. The problem was traced to a fatigue crack in an oil pipe requiring the replacement of some engines and modifications to the design. Trent-powered A380s operated by Lufthansa and Singapore Airlines were also affected. Qantas gradually returned its A380s to service over several months. In June 2011 the airline announced it had agreed to compensation of AU$ 95m (US$ 100m) from Rolls-Royce. On 17 April 2015, it
3894-420: Was interested only in the T40, but the complexities of the drive shaft arrangement doomed the engine and the project was eventually cancelled. Allison tried again with the T56 , basically an enlarged T38 with the power of the T40, and was eventually rewarded when this engine was selected to power the C-130 Hercules . Allison turboprop engines were also used to re-engine Convair prop airliners which resulted in
3960-416: Was invested in equipping the V-1710 with a complex two-stage supercharger, and when placed in aircraft designs like the P-39 or P-40, which lacked the room for a turbocharger, the engine suffered tremendously at higher altitudes. It was for this reason in particular that the V-1710 was later removed from the P-51 Mustang and replaced with the Rolls-Royce Merlin . With the need for the V-1710 winding down at
4026-424: Was renamed Rolls-Royce Industrial Power Group. It was sold off piecemeal over the next decade as the company re-focused on its core aero-engine operations following the recession of the early 1990s. On 21 November 1994, Rolls-Royce announced its intention to acquire the Allison Engine Company , an American manufacturer of gas turbines and components for aviation, industrial and marine engines. The two companies had
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#17327808234094092-570: Was replaced by a more flexible Special Security Arrangement . In 2001, Rolls-Royce and its LiftSystem was among the group that won the JSF contract for the F-35 . The Allison acquisition, at $ 525 million (equivalent to £328 million), brought four new engine types into the Rolls-Royce civil engine portfolio on seven platforms and several light aircraft applications. Allison is now known as Rolls-Royce Corporation , part of Rolls-Royce North America . In 1999 Rolls-Royce acquired Vickers plc for its marine businesses. The portion retained
4158-422: Was soon found as the primary power plant of the new generation of United States Army Air Corps (USAAC) fighters, the P-38 Lightning , P-39 Airacobra and P-40 Warhawk . The Army had been leaning heavily towards exhaust-driven turbochargers , instead of the more common mechanically driven superchargers , favoring the theoretical advantage of using the otherwise wasted energy in the exhaust. Thus, little effort
4224-413: Was started by the company in the early 1960s, when helicopters started to be powered by turbine, rather than reciprocating, engines. Allison turbine engines were used to power Bell 206 Jet Ranger and Long Ranger helicopters as well as the initial version of the Sikorsky S-76 helicopter. In the mid-1970s the Allison Division of General Motors Corporation in Detroit designed ceramic components into
4290-424: Was the X-4520, a 24-cylinder air-cooled 4-bank “X” configured engine designed by the Army Air Corps and built by the Allison Engineering Company in 1925. The result was presented to the Army in 1928, which turned down the development proposal. In 1929, shortly after the death of James Allison, the company was purchased by the Fisher brothers, who instructed it to use the cylinder design for a six-cylinder engine for
4356-403: Was the world's 16th largest defence contractor in 2018 when measured by defence revenues. The company is also the world's fourth largest commercial aircraft engine manufacturer, with a 12% market share as of 2020 . Rolls-Royce Holdings plc is listed on the London Stock Exchange, where it is a constituent of the FTSE 100 Index . At the close of London trading on 28 August 2019, the company had
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