Rolls-Royce Pearl 700 engine at home

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Rolls-Royce (Stand X93) is completing testing of its Pearl 700 engine for the ultra-long-range Gulfstream G700 and moving into “production mode”, said Colm Golden, Rolls-Royce senior vice president for the Pearl 700 program The company has delivered several sets of production engines to the OEM since handing over the first ones late last year and has already issued two-thirds of the necessary certification reports.

Meanwhile, Golden reports that the Pearl 10X test campaign for Dassault’s large-cabin flagship is also going well. The Pearl 700 and 10X are designed to produce over 18,000 pounds of thrust and deliver significant increases in efficiency.

Compared to the Rolls-Royce BR725 that powers the Gulfstream G650 series, the Pearl 700 offers an 8% increase in take-off thrust, a 12% better thrust-to-weight ratio and 5% higher efficiency. Rolls-Royce achieved these gains by combining advanced materials and manufacturing techniques, including the use of 3D-printed combustion slabs.

Using 3D printing on the tiles allows Rolls-Royce engineers to optimize their shape in ways that traditional manufacturing cannot, Golden said. “You can have more complex shapes and enable the most efficient combustion process.” He added that the technique is used to make other engine parts as well as mounts and levers, usually to save weight.

Metal injection molding is another relatively new technology applied to engine manufacturing that allows the production of complex shapes in a single step. The process creates and shapes parts by injection molding using powdered metal mixed with a binder material. Once molded, the binder material is removed from the part. Friction stir welding is also used in engine manufacturing. Like most new jet engines, the Pearls use a forged blisk fan to reduce weight and drag.

But Golden pointed out that the Pearl’s highly efficient core is really its secret sauce and that by optimizing it and the parts around it, Rolls-Royce has developed “the most efficient core in business aviation.” . Our technology provides new tools for our designers that can really take us to the next level, enabling smaller cores that deliver better performance. With bigger planes, hearts really have to get smaller,” Golden said. The Pearl’s “Advance2” core features a 10-stage high-pressure compressor with six titanium vanes and a 24:1 pressure ratio.

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