The 747 is Out and Green Airplanes Are in

upstart writes:

NASA has a plan to "skip a generation" of passenger aircraft design to fight climate change:

After more than 50 years in production, the final 747 is taking to the skies.

Boeing delivered the last 747 ever built to Atlas Air on Tuesday. Aviation enthusiast John Travolta was there and said the plane was the "most well-thought-out and safest aircraft ever built." Richard Branson said "farewell to a wonderful beast" in a Reuters interview, bemoaning the high fuel costs for transatlantic flights on the jumbo jet. Airlines had a similar attitude, as slowing 747 sales reflected higher demand for smaller, more fuel-efficient planes. In fact, sustainability is on Boeing's mind as well.

[...] Unlike cars, you can't simply bolt a battery onto a plane and make it electric. (Making an electric vehicle is more complicated than that, but you get the point.) Improvements to airplanes happen in small increments over the course of decades. Typically, a single-digit reduction in an aircraft's fuel consumption would be meaningful. Boeing says the innovations in the new truss-braced wing concept will amount to a 30 percent reduction. That's exactly the kind of leap NASA wanted to get out of the Sustainable Flight Demonstrator project, which Boeing won.

The big idea behind the transonic truss-braced wing concept is an update to the aircraft configuration, or the plane's architecture. Unlike the low-wing design that dominates the commercial aircraft configuration today, the new Boeing design has wings that stretch over the top of the plane's tubular body. This reduces drag, but it also allows for a wider variety of propulsion systems, from bigger jet engines to exposed propellers. It's also fast. The "transonic" part of the concept's name refers to its ability to fly just shy of the speed of sound, or around 600 miles per hour.

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