The Rolls-Royce BR700 family of

turbofan The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the ''turbo'' portion refers to a gas turbine engine which achieves mechanic ...

engines for

regional jet A regional jet (RJ) is a jet-powered regional airliner with fewer than 100 seats. The first one was the Sud-Aviation Caravelle in 1959, followed by the widespread Yakovlev Yak-40, Fokker F-28, and BAe 146. The 1990s saw the emergence of ...

s and corporate jets. It was developed by BMW 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 ...

through the joint venture BMW Rolls-Royce AeroEngines GmbH, established in 1990. The BR710 first ran in 1995. It is manufactured in Dahlewitz,

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. Rolls-Royce took full control of the company in 2000, which is now known as ''Rolls-Royce Deutschland''. The military designation of the series is F130.

Design and development

BR710

The BR710 is a twin shaft

, and entered service on the Gulfstream V in

1997 File:1997 Events Collage.png, From left, clockwise: The movie set of ''Titanic'', the highest-grossing movie in history at the time; '' Harry Potter and the Philosopher's Stone'', is published; Comet Hale-Bopp passes by Earth and becomes one of ...

and the

Bombardier Global Express The Bombardier Global Express is a large cabin, 6,000 nmi / 11,100 km range business jet designed and manufactured by Bombardier Aviation (formerly Bombardier Aerospace). Announced in October 1991, it first flew on 13 October 1996, receiv ...

in 1998. This version has also been selected to power the Gulfstream G550. The BR710 comprises a diameter single-stage fan, driven by a two-stage LP turbine, supercharging a ten-stage HP compressor (scaled from the V2500 unit) and 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 0.8 and altitude of . In May 2017, the 3,200 engines in service reached 10 million flying hours. Another rerated version, with a revised exhaust system, was selected for the now-cancelled

Royal Air Force The Royal Air Force (RAF) is the United Kingdom's air and space force. It was formed towards the end of the First World War on 1 April 1918, becoming the first independent air force in the world, by regrouping the Royal Flying Corps (RFC) an ...

Nimrod MRA4s.

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 single-aisle airliner produced by Boeing Commercial Airplanes. The twin-engine airliner was developed for the 100-seat market and originally marketed by McDonnell Douglas as the MD-95. It was a shor ...

. 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 (manufacturing), used in casting and molding * Core (optical fiber), the signal-carrying portion of an optical fiber * Core, the centra ...

power and thereby

net thrust Net or net may refer to: Mathematics and physics * Net (mathematics), a filter-like topological generalization of a sequence * Net, a linear system of divisors of dimension 2 * Net (polyhedron), an arrangement of polygons that can be folded up ...

. 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. Its prototype underwent component bench and its first full engine run in spring 2008. European certification was achieved in June 2009. The first Gulfstream G650, with BR725 engines, was delivered in December 2011. The engine has a maximum thrust of . The fan with 24 swept blades is larger than the BR710. The HP axial compressor benefits from three-dimensional

aerodynamics Aerodynamics, from grc, ἀήρ ''aero'' (air) + grc, δυναμική (dynamics), is the study of the motion of air, particularly when affected by a solid object, such as an airplane wing. It involves topics covered in the field of fluid dy ...

for greater efficiency and has 10 stages including five blisks 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, combustion chamber or flame holder. In a gas turbine engine, the ''combustor'' or combustion chamber is f ...

yields a longer life and lower emissions: 80% lower smoke and unburned hydrocarbons and 35% lower NOx 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 by a turbine can be used for generating ...

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 co ...

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 ev ...

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 fi ...

at Mach 0.85 and FL450 is . Rolls-Royce offered the BR725 (F130 in the US military) with for the

United States Air Force The United States Air Force (USAF) is the Aerial warfare, air military branch, service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part ...

’s (USAF)

B-52H Stratofortress The Boeing B-52 Stratofortress is an American long-range, 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 United States Air ...

Commercial Engine Replacement Program (CERP). On 24 September 2021 the USAF selected the F130, rejecting proposals from GE Aviation and Pratt & Whitney. The USAF intends to purchase 650 engines (608 direct replacements, 42 spare engines) for its fleet of 76 B-52H aircraft in a $2.6 billion deal. 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 def ...

Indianapolis, Indiana Indianapolis (), colloquially known as Indy, is the state capital and most populous city of the U.S. state of Indiana and the seat of Marion County. According to the U.S. Census Bureau, the consolidated population of Indianapolis and Mari ...

, plant.

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

reduction, 50% NOx 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 * High availability * Reliability (computer networking), a ...

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

Pearl 15

The Pearl engine was developed in Dahlewitz from the BR700 with

Advance Advance commonly refers to: *Advance, an offensive push in sports, games, thoughts, military combat, or sexual or romantic pursuits *Advance payment for goods or services *Advance against royalties, a payment to be offset against future royalty pa ...

2 technologies.

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

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 an electric discharge between the atmosphere and the ground. Most originate in a cumulonimbus cloud and terminate on the ground, called cloud-to-ground (CG) lightning. A less common type of strike, ground- ...

, water ingestion,

ice Ice is water frozen into a solid state, typically forming at or below temperatures of 0 degrees Celsius or Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaqu ...

, 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 with the Symbol (chemistry), 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, resista ...

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, or "true seal" ** Fur seal * Seal (emblem), a device to imp ...

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 fuel/air mix is burned. For steam engines, the term has also been used for an extension of the firebox which is used to allow a more complete combustion process. Intern ...

. Its core uses advanced

nickel Nickel is a chemical element with 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 slow ...

alloys and ceramic

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

s, includes a new 10-stage compressor with 6 titanium blisks 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 ratio of the stagnation pressure as measured at the front and rear of the compressor of a gas turbine engine. The terms ''compression ratio'' and ''pressure ...

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, a stretch of the previous G650. 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 18,000 lbf-thrust (80 kN), with a titanium fan blisk, 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 1820mm for the Gulfstream GV. ;BR700-710A2-20 :Variant with a takeoff rating and a maximum diameter of 1820mm for the Bombardier Global Express/XRS/5000/6000. ;BR700-710B3-40 :Variant with a takeoff rating for the

BAE Systems Nimrod MRA4 The BAE Systems Nimrod MRA4 was a planned maritime patrol and attack aircraft intended to replace the Hawker Siddeley Nimrod MR2. The rebuilt aircraft would have extended the operating life of the Nimrod fleet by several decades and signific ...

. ;BR700-710C4-11 :Variant with a takeoff rating and a maximum diameter of 1785mm for the Gulfstream GV-SP (G500/G550). ;BR700-710D5-21 :Variant with a takeoff rating and a maximum radius of 980mm 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 single-aisle airliner produced by Boeing Commercial Airplanes. The twin-engine airliner was developed for the 100-seat market and originally marketed by McDonnell Douglas as the MD-95. It was a shor ...

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 ...

rating and a maximum radius of 950 mm for the Gulfstream GVI (G650). ;BR700-TP :Turboprop variant rated at and targeted for the European Future Large Aircraft (eventual

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 capab ...

military transporter/tanker). The BR715 thrust ratings can be adjusted by changing a plug in the FADEC controller, meaning no engine change is required. The A1-30 can become a C1-30 with a simple plug and software change.

Applications

* Boeing B-52H Stratofortress (F130 variant) * Dassault Falcon 10X * Gulfstream V * Gulfstream G550 * Gulfstream G650/G700 *

Rekkof Netherlands Aircraft Company (formerly Rekkof Aircraft - from ''Fokker'' spelled backwards) is a Dutch company dedicated to restarting the production of upgraded versions of the Fokker 70 and Fokker 100 regional jets as production of those stopped ...

/ Fokker XF70/ XF100 * Tupolev Tu-334

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