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Rolls-Royce BR700: Wikis

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BR700 series
Rear view of a BR710
Type Turbofan
Manufacturer Rolls-Royce Deutschland
First run 1994
Major applications Gulfstream V
Boeing 717
BAE Systems Nimrod MRA4
Tupolev Tu-334
Global Express
Rekkof XF70/XF100[1]

The Rolls-Royce BR700 family of engines was developed by BMW and Rolls-Royce plc through the joint venture company BMW Rolls-Royce to power regional and corporate jets. Rolls-Royce took full control of the company in 2000 which is now known as Rolls-Royce Deutschland.

The company was established in 1990 and the first engine run (BR710) took place in September 1994.

Contents

Variants and applications

BR710

The BR700-710 (marketed as the BR710) is a twin shaft turbofan, entered service on the Gulfstream V in 1997 and the Bombardier Global Express in 1998. This version has also been selected to power the Gulfstream G550.

Another rerated version, with a revised exhaust system, will shortly enter service in the RAF Nimrod MRA4s.

Comprises a 48in diameter single stage fan, driven by a 2 stage LP turbine, supercharging a 10 stage HP compressor (scaled from the V2500 unit) and driven by a 2 stage, air-cooled, HP turbine.

BR700-710A1-10
Variant with a 65.6kN take-off rating and a maximum diameter of 1820mm.[2]
BR700-710A2-20
Variant with a 65.6kN take-off rating and a maximum diameter of 1820mm.[2]
BR700-710B3-40
Variant with a 69kN take-off rating for the BAE Nimrod MRA4.[3]
BR700-710C4-11
Variant with a 68.4kN take-off rating and a maximum diameter of 1785mm.[2]

BR715

Closeup of a BR715 engine on a Midwest Airlines Boeing 717

The BR700-715 (marketed as 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.

A new spool, comprising a 58in diameter single stage fan, with 2 stage LP compressor driven by a 3 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 power and thereby net thrust. However, a larger fan is required, to keep the specific thrust low enough to satisfy jet noise considerations.

BR700-715A1-30
Variant with a 83.23kN take-off rating for Boeing 717-200 basic gross weight variants.[4]
BR700-715B1-30
Variant with a 89.68kN take-off rating.[4]
BR700-715C1-30
Variant with a 95.33kN take-off rating for Boeing 717-200 high gross weight variants.[4]

BR725

The BR700-725 (marketed as the BR725) is a variant of the BR710 with a three stage-axial flow low pressure turbine to power the Gulfstream G650.[5] The engine has a maximum thrust of 17,000 pounds-force (75.6 kN).[6]

The BR725 has a bypass ratio of 4.4:1, which makes it 4 dB quieter than the predecessor BR710. Its 50-inch (127 cm) fan assembly consists of 24 swept titanium blades.

The BR725 prototype is undergoing component bench testing as of Spring 2008, and the first full engine run is planned for late Spring 2008.[7]

BR700-725A1-12
Variant with a 71.6kN take-off rating.[2]

Specifications

BR700 family specifications
BR710-48 BR715-58 BR725-50
Thrust (lb) 14,750-15,500 18,500-22,000 15,000-17,000
Dry Weight (lb) 4640 6155 4912 appx
Overall Length (in) 134.0 147.0 202.0 nacelle
Fan Diameter (in) 48.0 58.0 50.0

See also

Comparable engines

Related lists

References

External links


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