Rolls-Royce BR700
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The 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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[edit] Variants
| BR710 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 | 4912approx | |||||
| Overall Length (in) | 134.0 | 147.0 | 202.0nacelle? | |||||
| Fan Diameter (in) | 48.0 | 58.0 | 50.0 | |||||
[edit] BR710-A1-10, C2-20
The BR710, 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.
[edit] BR715-A1-30, B1-30, C1-30
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.
[edit] BR725
The BR725 is a new model intended to power the new 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]
[edit] References
- ^ Gulfstream G650 - Rolls-Royce power
- ^ "Rolls-Royce presents BR725 engine to power new Gulfstream G650", Rolls-Royce, 13 March 2008.
- ^ [Aerospace engineering & manufacturing, May 2008, p. 26 The monthly publication of SAE International]
- BR700: Technical data
- BR710: Power for ultra-long range business jets and special mission aircraft
- BR715: Power for the Boeing 717-200
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