An
MIT design team has produced a series of innovative commercial airliner designs that may offer as much as a 70% reduction in fuel use (with a correspondingly reduced carbon footprint):
In what could set the stage for a fundamental shift in commercial aviation, an MIT-led team has designed a green airplane that is estimated to use 70 percent less fuel than current planes while also reducing noise and emission of nitrogen oxides (NOx).
The design was one of two that the team, led by faculty from the Department of Aeronautics and Astronautics, presented to NASA last month as part of a $2.1 million research contract to develop environmental and performance concepts that will help guide the agency’s aeronautics research over the next 25 years. Known as “N+3” to denote three generations beyond today’s commercial transport fleet, the research program is aimed at identifying key technologies, such as advanced airframe configurations and propulsion systems, that will enable greener airplanes to take flight around 2035.
MIT was the only university to lead one of the six U.S. teams that won contracts from NASA in October 2008. Four teams — led by MIT, Boeing, GE Aviation and Northrop Grumman, respectively — studied concepts for subsonic (slower than the speed of sound) commercial planes, while teams led by Boeing and Lockheed-Martin studied concepts for supersonic (faster than the speed of sound) commercial aircraft. Led by AeroAstro faculty and students, including principal investigator Ed Greitzer, the H. Nelson Slater Professor of Aeronautics and Astronautics, the MIT team members include Aurora Flight Sciences Corporation and Pratt & Whitney.
Their objective was to develop concepts for, and evaluate the potential of, quieter subsonic commercial planes that would burn 70 percent less fuel and emit 75 percent less NOx than today’s commercial planes. NASA also wanted an aircraft that could take off from shorter runways. Designing an airplane that could meet NASA’s aggressive criteria while accounting for the changes in air travel in 2035 — when air traffic is expected to double — would require “a radical change,” according to Greitzer. Although automobiles have undergone extensive design changes over the last half-century, “aircraft silhouettes have basically remained the same over the past 50 years,” he said, describing the traditional, easily recognizable “tube-and-wing” structure of an aircraft’s wings and fuselage.
I has me doubts about that "when air traffic is expected to double" figure for 2035; there are a lot of factors that will probably constrain the growth of air travel.
There is also a strong possibility that these innovative designs will simply become another in a long series of, what used to be called 'viewgraph engineering': new ideas that offered fuel economy or other advantages and were never built. It may surprise some people; but, there is a conservatism in the aerospace industry and the airlines. The 'latest' designs from Boeing and Airbus are designed along the pattern established 60 years ago by the Boeing 707: swept wings and tail, and jet engines in under-wing pods. The aircraft makers have been eager to incorporate material improvements, such as composites, improved avionics (especially if they can replace flight crew members!) and improved engines.
As for the airlines, they've learned that it's more cost-effective to keep flying the same airframe decade-after-decade; just upgrade the engines and avionics on a regular basis.
Dr. Eric Drexler made a similar comment on his
Metamodern blog:
A new configuration with better aerodynamics, and a reminder that hundred-billion-dollar-scale opportunities are sometimes unexploited.
On the other hand, airlines are going to have to deal with both rising costs of fuel and increased public concerns about the carbon footprint of aviation. If governments (note plural) start seriously considering a Carbon Tax, we might finally see some real innovation in aircraft design.