NASA Flight Testing NASA's Prandtl-D Research Aircraft

NASA's Armstrong Flight Research Center engineers are working on an increasingly complex aircraft called the Preliminary Research Aerodynamic Design to Lower Drag, or Prandtl-D. The aircraft features a new method for determining the shape of the wing with a twist that could lead to an 11-percent reduction in fuel consumption. via NASA http://www.nasa.gov/image-feature/flight-testing-nasas-prandtl-d-research-aircraft