Engineers Explore Radical New Designs for Commercial Planes To Cut Energy Consumption and Emission

Modern airliner designs date from the 1950s: a metal tube and swept-back wings with jet engines slung underneath. They get you where you're going and back. But after decades of research, something very different could be flying you on vacation by the late 2030s. From a report: Unconventional designs such as "blended-wing" shapes now used for some military jets, which combine the cabin and wings in one piece, have been floated for years as possibilities for passenger aircraft. Now the rise of climate-change concerns and emergence of new manufacturing materials have brought a rethink a step closer to reality, scientists at the National Aeronautics and Space Administration say. Just about every fuel-saving aerodynamic efficiency has been wrung out of existing aircraft. The next generation will need bolder designs to meet new environmental standards and airline economics, and that's forcing plane makers back to the drawing board. The designs now exist mainly as artists' renderings, models and small-scale prototypes. That could be set to finally change. NASA in June launched a competition for U.S. companies to design and build a full-scale demonstrator. The rules require entrants to target planes around the size of a Boeing Co. 737 that can carry 150 passengers. The agency wants a prototype that could fly as early as 2027 and be ready for mass production in the next decade. The agency won't comment on the proposals submitted by the September deadline, but points to the recent history of alternative designs by researchers and aircraft makers. These include plane bodies that look like flying wings with passengers seated 10 or more across, compared with rows of six on a Boeing 737. Others have long, thin wings that would have to fold to fit into airport gates. In some designs, jets under the wing are replaced by rear-facing propellers mounted on the back of the plane. NASA held a similar competition 10 years ago that focused more on the efficiency of the designs than the ability to make them commercially feasible. Now, it is focused on aircraft that are more efficient and can enter the fleet to make a difference to aviation industry emissions. "We've been working on advanced configurations for 20 years, but last time I went to the airport I didn't see any of them flying around," says Brent Cobleigh, NASA's flight demonstrations and capabilities project manager. Aircraft designers have coalesced around three main designs, which people involved in the latest contest said are expected to feature prominently in the entries. They carry exotic names -- such as transonic truss-braced wings, blended-wing bodies and double bubbles -- that reflect how far removed they are from most of the conventional planes that now carry commercial passengers worldwide. NASA earmarked only around $1 billion of its $26 billion fiscal 2023 budget request for aircraft-related activities, in line with past years, but officials say its work has influenced every part of planes now flying.

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