| BR700 series | |
|---|---|
| Rear view of a BR710 | |
| Type | Turbofan |
| Manufacturer | BMW Rolls-Royce Rolls-Royce Deutschland |
| First run | 1994 |
| Major applications | Bombardier Global Express Boeing 717 Gulfstream V |
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.
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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, was selected for the now cancelled Royal Air Force 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.
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 LP 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.
The BR725 is a variant of the BR710 with a three stage-axial flow low pressure turbine to power the Gulfstream G650.[1] The engine has a maximum thrust of 17,000 pounds-force (75.6 kN).[2]
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.[3]
| 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 | |||||
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