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机译:超意计划

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Rolls-Royce is keeping to its original UltraFan future engine development plan and targeting a fast-paced series of tests through the remainder of 2019, despite its decision earlier this year to withdraw the geared-propulsion concept from Boeing's new midmarket airplane (NMA) engine competition. First announced by Rolls in 2014, the shift to the geared-engine architecture remains the company's No. 1 priority for its long-term future gas turbine development plan and, offering a 25%-plus efficiency improvement over the Trent 700, it will be available in the second half of the 2020s. Although the UltraFan development timetable was close to Boeing's 2025 initial service-entry target for the NMA, Rolls dropped its bid on Feb. 28 after acknowledging an unacceptable schedule risk (AW&STMarch 11-24, p. 14). The engine concept, which is scalable for use on both single- and twin-aisle aircraft, is therefore currently without a specific application, although Rolls says discussions with manufacturers on unidentified projects are underway.
机译:Rolls-Royce正在通过2019年早些时候的剩余时间来保持其原始超级未来发动机开发计划,并瞄准快节奏的一系列测试,尽管今年早些时候决定撤回波音新的中型飞机(NMA)发动机的推进推进概念竞赛。首先由2014年汇款宣布,转向齿轮发动机架构仍然是该公司的第1号优先考虑其长期未来的燃气轮机开发计划,并为特伦特700提供了25%的效率改善,将是在2020年代的下半部分提供。虽然超人开发时间表接近波音2025年的NMA初始服务入境目标,但28日劳动力在确认不可接受的时间表风险(AW&STMarch 11-24,第14页)后,劳动力下降。因此,发动机概念可用于单个和双通道飞机,因此目前没有特定应用,尽管劳动者说,与未认出的项目的制造商进行讨论正在进行中。

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