Silent Flight!? No more Sonic Boom!

A new U.S. Air Force drone could help solve the sonic boom problem that has prevented supersonic airline travel from really taking off. NASA plans to see how the robotic airplane's computer can adjust to turbulence during subsonic test flights this summer. The small X-56A drone has long, thin wings and flies slower than the speed of sound. But it can test software programs that respond automatically to uncontrollable vibrations from the force of air flowing over its flexible wings — useful… (www.space.com) المزيد...