BR725

The BR725 is the most advanced member of the BR700 engine series. Its advanced technology and outstanding performance levels will enable a whole new class of business jets. It will operate in a market segment worth an estimated $14 billion in engine sales over the next 20 years.

The first application for the 16,100lb thrust BR725 engine will be Gulfstream‟s new flagship corporate jet – the G650.

The BR725 combines proven features from the BR700 and Trent engine families with new technologies derived from ongoing Rolls-Royce „Vision‟ technology acquisition programs.

Compared with its highly successful predecessor, the BR710, the BR725 is more powerful, has 4 percent better specific fuel consumption and shows 21 percent improvement in NOx emissions.

The 50-inch diameter fan is made up of 24 “swept” titanium blades for improved aerodynamic efficiency and lower noise. Its weight was optimized by incorporating composite fan outlet guide vanes, a single piece nose cone and a solid titanium fan case. The new, all-composite nacelle has a new inlet cowl to house the larger fan. The nacelle diameter is the same size as on the BR710.

Five stages of blisks optimize the weight of the BR725 high-pressure compressor, while 3D aero optimization and the introduction of elliptical leading edges lead to higher efficiency. The BR725 combustor is based on proven BR715 design, which is renowned for its low emissions and long life. The high-pressure turbine features two shrouded stages and profiled end walls. Via active tip clearance control cruise fuel burn can be improved.
The BR725 received type certification from the US Federal Aviation Administration (FAA) in December 2009. The certification covers a thrust rating of 16,100lbf (71.6 kN) and follows certification from the European Aviation Safety Agency (EASA) in June 2009.

On November 25 2009, the BR725 powered the successful first flight of the Gulfstream G650. The first engine run of a BR725 was successfully completed in April 2008 at the Rolls-Royce facility in Dahlewitz, Germany.
In August 2010, Gulfstream Aerospace Corp. announced that its ultra-long-range, ultra-large-cabin Gulfstream G650 reached Mach 0.995 as part of its flight-test program.