NASA, US Air Force unveil new X-plane — the X-66A [codename:TTBW]— to test wild wing design for fuel-efficient flight - News and Discussion

Hamartia Antidote

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No, not the same tech as the x-65...


The X-66A could "shape the future of aviation."

graphic illustration showing an aerial view of the X-66A plane flying above water and a forested area to the right.

The X-66A plane will help the U.S. achieve the goal of net-zero greenhouse gas emissions by 2050. (Image credit: NASA)
NASA's latest experimental X-plane has received a name.


The United States Air Force has designated the plane, designed in conjunction with Boeing through NASA's Sustainable Flight Demonstrator project as the X-66A.

The X-66A is also the first X-plane designed specifically to help the U.S. achieve the net-zero goal for aviation greenhouse gas emissions, set out in the White House's U.S. Aviation Climate Action Plan, released in 2021.

NASA said in a press release that the X-66A could inform a new generation of sustainable single-aisle aircraft, planes that currently operated as the backbone of passenger-bassed air travel. As a result of their heavy usage, single-aisle aircraft account for around half of aviation greenhouse gas emissions across the globe. This means a sustainable version of such a craft could have a major impact on greenhouse gas emissions.

"At NASA, our eyes are not just focused on stars but also fixated on the sky. The Sustainable Flight Demonstrator builds on NASA's world-leading efforts in aeronautics as well climate," NASA Administrator Bill Nelson said in the statement. "The X-66A will help shape the future of aviation, a new era where aircraft are greener, cleaner, and quieter and create
new possibilities for the flying public and American industry alike."

NASA has a Funded Space Act Agreement with Boeing for the Sustainable Flight Demonstrator, which will see the space agency make an investment of $425 million over seven years. While NASA also provides the facilities and technical expertise for the project, Boeing and its partners will contribute an estimated $725 million to its funding.

Together with Boeing, this will see NASA build and fly a full-sized demonstration of the X-66A with extra long thin wings stabilized by diagonal struts, a design called a "Transonic Truss-Braced Wing."

X-plane status is granted by the Air Force to development programs such as that of the X-66A, which aim to create revolutionary experimental aircraft configurations. Usually reserved for research aircraft, the X-planes should test novel designs and new technologies that can be integrated into other aircraft rather than planes designed to be prototypes for full production.

"We're incredibly proud of this designation because it means that the X-66A will be the next in a long line of experimental aircraft used to validate breakthrough designs that have transformed aviation," Boeing chief technology officer Todd Citron said. "With the learnings gained from design, construction, and flight testing, we'll have an opportunity to shape the future of flight and contribute to the decarbonization of aerospace."

In the case of the X-66A, the X-plane status recognizes the design's Transonic Truss-Braced Wing configuration that, in combination with advancements in propulsion systems, and materials, could lead to a reduction of 30% in fuel consumption and fewer emissions in comparison to current "best-in-class" aircraft.

The aircraft is the latest in a long line of X-planes created by NASA, dating back to the 1940s, and the space agency's predecessor, the National Advisory Committee for Aeronautics (NACA), which founded an experimental aircraft program with the Air Force and the U.S. Navy. With its emphasis on emission reduction, the X-66A may just be one of the most important X-planes yet.

"To reach our goal of net zero aviation emissions by 2050, we need transformative aircraft concepts like the ones we're flying on the X-66A," associate administrator for NASA's Aeronautics Research Mission Directorate Bob Pearce said. "With this experimental aircraft, we're aiming high to demonstrate the kinds of energy-saving, emissions-reducing technologies the aviation industry needs."


 

RTX selected by Boeing for X-66A NASA Sustainable Flight Demonstrator Project


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RTX (NYSE: RTX) has been selected by Boeing as a collaborator on the X-66A flight demonstrator, part of NASA's Sustainable Flight Demonstrator project. Two RTX business units, Pratt & Whitney and Collins Aerospace, will support Boeing with Pratt & Whitney GTF™ engines, and Collins nacelles and engine accessories. Pratt & Whitney and Collins will also support ground and flight tests, slated to start in 2028.


The Sustainable Flight Demonstrator is part of NASA's broader Sustainable Flight National Partnership, which is dedicated to developing the technologies needed to achieve net-zero CO2 emissions for commercial aviation. Boeing's X-66A program is focused on developing the Transonic Truss-Braced Wing (TTBW) concept, which could enable significant improvements in fuel efficiency and reduced emissions for next generation single-aisle aircraft.

"NASA's Sustainable Flight Demonstrator is a leading example of how public-private partnerships can help foster the technological breakthroughs needed to deliver on the industry-wide goal of a more sustainable, net-zero emissions future," said Geoff Hunt, senior vice president of Engineering & Technology at Pratt & Whitney. "We'll work with Boeing to apply GTF engines to the X-66A and help demonstrate the potential of its pioneering truss-braced wing design."

The GTF engine, with its revolutionary geared fan architecture, delivers industry-leading fuel efficiency and sustainability benefits for single-aisle aircraft. With up to 20% better fuel efficiency, GTF engines have helped airlines save more than 1.4 billion gallons of fuel and over 14 million metric tons of CO2 emissions since entering service in 2016. GTF engines are certified to operate with sustainable aviation fuel (SAF) and offer up to a 75% reduction in aircraft noise footprint compared to previous generation engines.

"Collins has a long history of successful partnerships with NASA, Boeing, and Pratt & Whitney, with decades of experience pushing the boundaries of innovation in aerospace," said Dr. Mauro Atalla, senior vice president, Engineering & Technology for Collins. "Now, as part of the Sustainable Flight Demonstrator program, we will work together to demonstrate new technologies and systems to support the next generation of low-emission single-aisle aircraft that will play an integral role in reducing the environmental footprint of the aviation industry."

Collins' nacelles consist of lightweight and durable composite and metallic materials that encase the engine and serve many functions, including safeguarding the engine, controlling airflow, reducing noise and facilitating thrust reversal for deceleration during aircraft landings. In addition, Collins provides the control system components for the GTF engine, including heat exchangers, the integrated fuel pump and control, the air turbine starter and electronic controls.

"The learnings from the Sustainable Flight Demonstrator, X-66, and the partnership with NASA are important elements in the industry's efforts to decarbonize aviation," said Dr. Todd Citron, Boeing's Chief Technology Officer. "We're grateful for the support from RTX on this critical effort."

RTX is advancing a wide range of technologies to support the future of sustainable aviation, including engine readiness for unblended 100% SAF, hybrid-electric propulsion and hydrogen fuel. Pratt & Whitney and Collins are also collaborating with NASA on other Sustainable Flight National Partnership projects, including Hybrid Thermally Efficient Core (HyTEC) and Hi-Rate Composite Aircraft Manufacturing (HiCAM).

About RTX

RTX is the world's largest aerospace and defense company. With more than 180,000 global employees, we push the limits of technology and science to redefine how we connect and protect our world. Through industry-leading businesses – Collins Aerospace, Pratt & Whitney, and Raytheon – we are advancing aviation, engineering integrated defense systems for operational success, and developing next-generation technology solutions and manufacturing to help global customers address their most critical challenges. The company, with 2022 sales of $67 billion, is headquartered in Arlington, Virginia.
 

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