The Rolls-Royce BR700 is a family of

turbofan A turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft engine, aircraft propulsion. The word "turbofan" is a combination of references to the preceding generation engine technology of the turbojet and the add ...

engines for

regional jet A regional jet (RJ) is a jet airliner, jet-powered regional airliner usually defined by having fewer than 100 seats. The first aircraft considered part of this category was the Sud-Aviation Caravelle in 1959, followed by Douglas DC-9, BAC O ...

s and

corporate jet A business jet, private jet, or bizjet is a jet aircraft designed for transporting small groups of people, typically business executives and high-ranking coworker, associates. Business jets are generally designed for faster air travel and more ...

s. It is manufactured in Dahlewitz,

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

, by

Rolls-Royce Deutschland Rolls-Royce Deutschland is a subsidiary of British aircraft engine maker Rolls-Royce plc. Its primarily facilities are located at Dahlewitz outside Berlin and Motorenfabrik Oberursel at Oberursel near Frankfurt am Main. The company was ...

: this was initially a joint venture of

BMW Bayerische Motoren Werke AG, trading as BMW Group (commonly abbreviated to BMW (), sometimes anglicised as Bavarian Motor Works), is a German multinational manufacturer of vehicles and motorcycles headquartered in Munich, Bavaria, Germany. Th ...

and

Rolls-Royce plc Rolls-Royce Holdings plc 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 ...

established in 1990 to develop this engine. The BR710 first ran in 1995. The United States military designation for the BR725 variant is F130.

Design and development

BR710

The BR710 is a twin shaft

, and entered service on the

Gulfstream V The Gulfstream V (Model GV, pronounced "G-five") is a large, long-range business jet aircraft produced by Gulfstream Aerospace, derived from the previous Gulfstream IV. It flies up to , up to and has a range. It typically accommodates four c ...

1997 Events January * January 1 – The Emergency Alert System is introduced in the United States. * January 11 – Turkey threatens Cyprus on account of a deal to buy Russian S-300 missiles, prompting the Cypriot Missile Crisis. * January 1 ...

and the

Bombardier Global Express The Bombardier Global Express is a large cabin, long-range business jet designed and manufactured by Bombardier Aviation. Announced in October 1991, it first flew in October 1996, received its Canadian type certification in July 1998 and ente ...

in 1998. This version has also been selected to power the

Gulfstream G550 The Gulfstream G550 is an American business jet aircraft produced by the General Dynamics' Gulfstream Aerospace unit in Savannah, Georgia, US. The certification designation is GV-SP. A version with reduced fuel capacity was marketed as the G50 ...

. The BR710 comprises a diameter single-stage fan, driven by a two-stage LP turbine, and a ten-stage HP

compressor A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Many compressors can be staged, that is, the gas is compressed several times in steps o ...

(scaled from the V2500 unit) driven by a two-stage, air-cooled, HP turbine. This engine has a

thrust-specific fuel consumption Thrust-specific fuel consumption (TSFC) is the fuel efficiency of an engine design with respect to thrust output. TSFC may also be thought of as fuel consumption (grams/second) per unit of thrust (newtons, or N), hence ''thrust-specific''. This fig ...

(TSFC) of at static sea level takeoff and at a cruise speed of

Mach The Mach number (M or Ma), often only Mach, (; ) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a Boundary (thermodynamic), boundary to the local speed of sound. It is named after the Austrian physi ...

0.8 and altitude of . In May 2017, the 3,200 engines in service reached 10 million flying hours.

BR715

The BR715 is another twin-shaft turbofan; this engine was first run in April 1997 and entered service in mid-1999. This version powers the

Boeing 717 The Boeing 717 is an American five-abreast narrow-body aircraft, narrow-body airliner produced by Boeing Commercial Airplanes. The Twinjet, twin-engine airliner was developed for the 100-seat market and originally marketed by McDonnell Dougla ...

. A new LP spool, comprising a diameter single-stage fan, with two-stage LP compressor driven by a three-stage LP turbine, is incorporated into the BR715. The HP spool is similar to that of the BR710. The IP compressor booster stages supercharge the core, increasing

core Core or cores may refer to: Science and technology * Core (anatomy), everything except the appendages * Core (laboratory), a highly specialized shared research resource * Core (manufacturing), used in casting and molding * Core (optical fiber ...

power and thereby net thrust. However, a larger fan is required, to keep the

specific thrust Specific thrust is the thrust per unit air mass flowrate of a jet engine (e.g. turbojet, turbofan, etc.) and can be calculated by the ratio of net thrust/total intake airflow. Low specific thrust engines tend to be more efficient of propellant (a ...

low enough to satisfy jet noise considerations. This engine has a TSFC of at static sea level takeoff and at a cruise speed of Mach 0.8 and altitude of .

BR725

The BR725 is a variant of the BR710 to power the

Gulfstream G650 The Gulfstream G650, G700, and G800 are large Business jet, business jets produced by the American company Gulfstream Aerospace.axial compressor An axial compressor is a gas compressor that can continuously pressurize gases. It is a rotating, airfoil-based compressor in which the gas or working fluid principally flows parallel to the axis of rotation, or axially. This differs from other ...

benefits from three-dimensional

aerodynamics Aerodynamics () is the study of the motion of atmosphere of Earth, air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dynamics and its subfield of gas dynamics, and is an ...

for greater efficiency and has 10 stages including five

blisk A blisk (portmanteau of bladed disk) is a turbomachine component comprising both rotor disk and blades as a single part instead of a disk assembled with individual removable blades. Blisks generally have better aerodynamics than conventional rot ...

s to reduce weight. The BR715 inspired

combustor A combustor is a component or area of a gas turbine, ramjet, or scramjet engine where combustion takes place. It is also known as a burner, burner can, combustion chamber or flame holder. In a gas turbine engine, the ''combustor'' or combustion ...

yields a longer life and lower emissions: 80% lower smoke and unburned hydrocarbons and 35% lower

NOx In atmospheric chemistry, is shorthand for nitric oxide () and nitrogen dioxide (), the nitrogen oxides that are most relevant for air pollution. These gases contribute to the formation of smog and acid rain, as well as affecting tro ...

than CAEP 6 limits. The two-stage HP

turbine A turbine ( or ) (from the Greek , ''tyrbē'', or Latin ''turbo'', meaning vortex) is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced can be used for generating electrical ...

has blade

active tip-clearance control Active clearance control (ACC) is a method used in large aircraft gas turbines to improve fuel efficiency during cruise. This is achieved by setting the turbine tip clearance at more than one operating point and contrasts with passive clearance con ...

for more efficiency; 3D aerodynamics reduce the cooling air flow. The LP turbine has three stages instead of two. The BR725 has a

bypass ratio The bypass ratio (BPR) of a turbofan engine is the ratio between the mass flow rate of the bypass stream to the mass flow rate entering the core. A 10:1 bypass ratio, for example, means that 10 kg of air passes through the bypass duct for eve ...

of 4.2:1 and is 4 dB quieter than the predecessor BR710. Its cruise

thrust specific fuel consumption Thrust-specific fuel consumption (TSFC) is the fuel efficiency of an engine design with respect to thrust output. TSFC may also be thought of as fuel consumption (grams/second) per unit of thrust (newtons, or N), hence ''thrust-specific''. This fig ...

at Mach 0.85 and FL450 is .

F130

On 24 September 2021, the

United States Air Force The United States Air Force (USAF) is the Air force, air service branch of the United States Department of Defense. It is one of the six United States Armed Forces and one of the eight uniformed services of the United States. Tracing its ori ...

(USAF) selected the F130 (the US military designation for the BR725) for the

B-52H Stratofortress The Boeing B-52 Stratofortress is an American long-range, subsonic aircraft, subsonic, jet-powered strategic bomber. The B-52 was designed and built by Boeing, which has continued to provide support and upgrades. It has been operated by the ...

Commercial Engine Replacement Program (CERP). This version has thrust, similar to the existing engines ( Pratt & Whitney TF33). The USAF will purchase 650 engines (608 direct replacements, 42 spares) for its fleet of 76 B-52H aircraft in a $2.6 billion deal; upgraded aircraft will be redesignated B-52J. The CERP engines will be built at

Rolls-Royce North America Rolls-Royce North America, Inc. is a subsidiary of multinational corporation Rolls-Royce plc. The American unit operates under a Special Security Arrangement which allows it to work independently on some of the most sensitive United States de ...

's plant in

Indianapolis Indianapolis ( ), colloquially known as Indy, is the List of capitals in the United States, capital and List of municipalities in Indiana, most populous city of the U.S. state of Indiana and the county seat of Marion County, Indiana, Marion ...

Indiana Indiana ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Michigan to the northwest, Michigan to the north and northeast, Ohio to the east, the Ohio River and Kentucky to the s ...

Future developments

The Advance 2 development effort inserts new, advanced technology into existing class BR710 and the larger BR725 engines. An even larger engine will also be made, with a fan. The BR710 and BR715 main developments, the next generation of engines to be introduced in the 2020s, will have an Advance 3 core, improved engine health management, newer materials, and cooling. They will also have a “

” fan made out of titanium, with an overall pressure ratio of 50:1. These improvements will yield a 10%

reduction, 50%

margin improvement, 99.995%

reliability Reliability, reliable, or unreliable may refer to: Science, technology, and mathematics Computing * Data reliability (disambiguation), a property of some disk arrays in computer storage * Reliability (computer networking), a category used to des ...

, and a 20% better thrust-to-weight ratio.

Pearl 15

The Pearl engine was developed in Dahlewitz from the BR700 with Advance2 technologies.

EASA The European Union Aviation Safety Agency (EASA) is an agency of the European Commission with responsibility for civil aviation safety in the European Union. It carries out certification, regulation and standardisation and also performs inve ...

certification was applied for on 28 February 2015. It made its first ground run in 2015, type tests in 2016, and flight tests in 2017. Six test engines logged over 6,000 cycles on 2,000 test hours. The test program included

lightning strike A lightning strike or lightning bolt is a lightning event in which an electric discharge takes place between the atmosphere and the ground. Most originate in a cumulonimbus cloud and terminate on the ground, called cloud-to-ground (CG) lightning ...

, water ingestion,

ice Ice is water that is frozen into a solid state, typically forming at or below temperatures of 0 ° C, 32 ° F, or 273.15 K. It occurs naturally on Earth, on other planets, in Oort cloud objects, and as interstellar ice. As a naturally oc ...

, and -40 °C cold-start testing. EASA certification was granted on 28 February 2018 and it was unveiled on 28 May 2018. It was undergoing flight tests in May 2018 for an end of 2019 planned entry into service aboard the

5500 and 6500 developments. It should have logged 10,000 hours by then. Its layout is similar to the BR725, with the same stage count and 24

titanium Titanium is a chemical element; it has symbol Ti and atomic number 22. Found in nature only as an oxide, it can be reduced to produce a lustrous transition metal with a silver color, low density, and high strength, resistant to corrosion in ...

fan blades. Its fan has a diameter. The enhanced 3-stage turbine with advanced high temperature materials, advanced segments and

seal Seal may refer to any of the following: Common uses * Pinniped, a diverse group of semi-aquatic marine mammals, many of which are commonly called seals, particularly: ** Earless seal, also called "true seal" ** Fur seal ** Eared seal * Seal ( ...

s allow for higher pressures and temperatures and the new low emissions cooled

includes a new tiled

combustion chamber A combustion chamber is part of an internal combustion engine in which the air–fuel ratio, fuel/air mix is burned. For steam engines, the term has also been used for an extension of the Firebox (steam engine), firebox which is used to allow a mo ...

. Its core uses advanced

nickel Nickel is a chemical element; it has symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive, but large pieces are slo ...

alloys and ceramic

coating A coating is a covering that is applied to the surface of an object, or substrate. The purpose of applying the coating may be decorative, functional, or both. Coatings may be applied as liquids, gases or solids e.g. powder coatings. Paints ...

s, includes a new 10-stage compressor with 6 titanium

s and a new 2-stage HP

with enhanced aerodynamics and blade cooling, enhanced segments and seals. Its

overall pressure ratio In aeronautical engineering, overall pressure ratio, or overall compression ratio, is the amount of times the pressure increases due to ram compression and the work done by the compressor stages. The compressor pressure ratio is the ratio of the ...

attains 43:1 and its

4.8:1. The HP compressor ratio rises to 24:1. It delivers up to 9% more thrust with and a 7% TSFC improvement while being 2 decibels quieter. Health monitoring should improve on the BR710 99.97% dispatch reliability which is logging one unplanned engine removal per 100,000 hours while the BR715 is approaching zero unplanned removals.

Pearl 700

The Pearl 700 will power the

Gulfstream G700 The Gulfstream G650, G700, and G800 are large business jets produced by the American company Gulfstream Aerospace.

, a stretch of the previous G650, and the G800, with more range than the G650ER. Evolved from the BR725 with a similar architecture plus a fourth low-pressure turbine stage and a larger, blisk fan, its bypass ratio is higher than 6.5:1 and its overall pressure ratio should exceed 50:1. It should provide of thrust, 3-5% better

than the BR725 variant powering the Gulfstream G650, reduced emissions and lower noise.

Pearl 10X

The upcoming Dassault Falcon 10X will be powered by two Pearl 10X engines over thrust, with a titanium fan

, a 10-stage compressor, a two-stage shroudless HP turbine and a four-stage turbine. The initial Pearl 10X test engine was first run in early 2022 and the programme had accumulated 1,000h of testing by May, along with the Advance2 demonstrator. The Advance2 core and new low-pressure system allows 5% more efficiency than the previous Rolls-Royce business jet engines.

Variants

;BR700-710A1-10 :Variant with a takeoff rating and a maximum diameter of for the Gulfstream GV. ;BR700-710A2-20 :Variant with a takeoff rating and a maximum diameter of for the Bombardier Global Express/XRS/5000/6000. ;BR700-710B3-40 :Variant with a takeoff rating for the BAE Systems Nimrod MRA4. ;BR700-710C4-11 :Variant with a takeoff rating and a maximum diameter of for the Gulfstream GV-SP (G500/G550). ;BR700-710D5-21 :Variant with a takeoff rating and a maximum radius of for the Bombardier Global 5500/6500. ;BR700-715A1-30 :Variant with a takeoff rating for

Boeing 717-200 The Boeing 717 is an American five-abreast narrow-body airliner produced by Boeing Commercial Airplanes. The twin-engine airliner was developed for the 100-seat market and originally marketed by McDonnell Douglas in the early 1990s as the MD- ...

basic gross weight variants. ;BR700-715B1-30 :Variant with an takeoff rating. ;BR700-715C1-30 :Variant with a takeoff rating for

high gross weight variants. ;BR700-725A1-12 :Variant with a

takeoff Takeoff is the phase of flight in which an aerospace vehicle leaves the ground and becomes airborne. For aircraft traveling vertically, this is known as liftoff. For aircraft that take off horizontally, this usually involves starting with a tr ...

rating and a fan diameter of for the Gulfstream GVI (G650). ;F130 :Military variant of the BR700-725 with a

maximum In mathematical analysis, the maximum and minimum of a function (mathematics), function are, respectively, the greatest and least value taken by the function. Known generically as extremum, they may be defined either within a given Interval (ma ...

rating for the

Boeing B-52 Stratofortress The Boeing B-52 Stratofortress is an American long-range, subsonic aircraft, subsonic, jet-powered strategic bomber. The B-52 was designed and built by Boeing, which has continued to provide support and upgrades. It has been operated by the ...

. ;BR700-TP :Turboprop variant rated at and proposed for the European

Future Large Aircraft The Airbus A400M AtlasNamed after the Greek mythological figure. is a European four-engine turboprop military transport aircraft. It was designed by Airbus Military, now Airbus Defence and Space, as a tactical airlifter with strategic capabil ...

(which became the

Airbus A400M Atlas The Airbus A400M AtlasNamed after the Greek mythological figure. is a European four-engine turboprop military transport aircraft. It was designed by Airbus Military, now Airbus Defence and Space, as a tactical airlifter with strategic capa ...

military transporter/tanker). The BR715 thrust ratings can be adjusted by changing a plug in the

FADEC A full authority digital engine (or electronics) control (FADEC) is a system consisting of a digital computer, called an "electronic engine controller" (EEC) or " engine control unit" (ECU), and its related accessories that control all aspects of a ...

controller, meaning no engine change is required. The A1-30 can become a C1-30 with a simple plug and software change.

Applications

* BAE Systems Nimrod MRA4 *

* Boeing B-52J Stratofortress (F130 variant) * Dassault Falcon 10X *

Gulfstream G650 The Gulfstream G650, G700, and G800 are large Business jet, business jets produced by the American company Gulfstream Aerospace.Rekkof Fokker Next Gen NV (formerly Rekkof Restart - from ''Fokker'' spelled backwards, Rekkof Aircraft, and Netherlands Aircraft Company) is a Dutch company dedicated to develop and manufacture a hydrogen-powered regional airliner. History Initi ...

Fokker Fokker (; ) was a Dutch aircraft manufacturer that operated from 1912 to 1996. The company was founded by the Dutch aviator Anthony Fokker and became famous during World War I for its fighter aircraft. During its most successful period in the 19 ...

XF70/ XF100 *

Tupolev Tu-334 The Tupolev Tu-334 () was a Russian Short haul, short-to-medium range airliner project that was developed to replace the aging Tupolev Tu-134 and Yak-42s in service around the world. The airframe was based on a shortened Tupolev Tu-204, Tu-20 ...

Specifications

References

External links

BR700: Technical data

BR710: Power for ultra-long range business jets and special mission aircraft
* {{aeroengine-specs High-bypass turbofan engines 1990s turbofan engines