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Boeing NMA Engine and Fuselage-Shape Selections Loom

机译：波音NMA发动机和机身形状选择机

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As it gears up to launch its first clean-sheet design in 15 years, Boeing will soon make decisions that will indicate how it plans to keep the aircraft's total cost of ownership low. The new midmarket airplane (NMA) was this summer described as using proven technologies to avoid the usual hefty bill and long development that breakthrough features imply. But the airframer has options that could send the program in a different direction and embark on real innovations.Ihssane Mounir, Boeing's vice president for commercial sales and marketing, is prioritizing life-cycle costs over the use of new technologies. "The costs we will offer will have nothing to do with today's costs," he said in June. In engines, CFM is bidding a conventional turbofan design leveraging Leap, GEnx and GE9X technology, while both Pratt & Whitney andRolls-Royce are offering gear-driven fan concepts. All three engine-makers submitted bids to Boeing in June, covering powerplants with slightly more than 50,000 lb. thrust.CFM has not disclosed details of its NMA engine design, but President and CEO Gael Meheust stresses that "using Leap-level technology is the way italways should be.... You bring in all the technology that's already been developed, either in service with current engines or in programs you specifically did to validate those techs."While that approach may please the promoters of proven technologies, Pratt and Rolls will be strong contenders with likely aggressive reduction targets in fuel burn. Rolls has passed major development milestones for its next-generation large commercial turbofan product line, and has frozen the configuration of its UltraFan gearedengine concept. Such an architecture is new for Rolls-Royce.
机译：波音公司正准备在15年内推出其首张无尘纸设计，不久将做出决策，表明其计划如何降低飞机的总体拥有成本。今年夏天，这种新型的中型飞机（NMA）被描述为使用成熟的技术来避免通常的高额费用和突破性功能所暗示的长期发展。但波音公司有选择权，可以将程序推向另一个方向并着手进行真正的创新。波音公司商业销售和营销副总裁伊萨内·穆尼尔（Issane Mounir）认为，生命周期成本要优先于新技术的使用。他在六月份说：“我们将提供的成本与今天的成本无关。”在发动机方面，CFM竞标采用Leap，GEnx和GE9X技术的传统涡轮风扇设计，而普惠公司和罗尔斯·罗伊斯公司都提供齿轮驱动的风扇概念。这三家发动机制造商都在6月份向波音公司提交了投标书，其中涉及推力略高于50,000磅的动力装置。CFM没有透露其NMA发动机设计的细节，但总裁兼首席执行官Gael Meheust强调“使用Leap级技术是您应该引入所有已经开发的技术，无论是在当前引擎的服务中，还是在为验证这些技术而专门进行的程序中，都采用了这种技术。“尽管这种方法可能会让经过验证的技术的发起者Pratt和劳斯莱斯将成为强有力的竞争者，可能会大幅削减燃料消耗目标。罗尔斯（Rolls）已为其下一代大型商用涡轮风扇产品线突破了重要的发展里程碑，并冻结了UltraFan齿轮发动机概念的配置。这种架构对于劳斯莱斯来说是新的。

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