This closeup of Boeing Phantom Works' unique X-48B Blended Wing Body technology demonstrator shows off its unusual engine placement and supercritical airfoil.

Boeing Phantom Works' subscale Blended Wing Body technology demonstration aircraft began its initial flight tests from NASA's Dryden Flight Research Center at Edwards Air Force Base, Calif. in the summer of 2007. The 8.5 percent dynamically scaled unmanned aircraft, designated the X-48B by the Air Force, is designed to mimic the aerodynamic characteristics of a full-scale large cargo transport aircraft with the same blended wing body shape. The initial flight tests focused on evaluation of the X-48B's low-speed flight characteristics and handling qualities. About 25 flights were planned to gather data in these low-speed flight regimes. Based on the results of the initial flight test series, a second set of flight tests was planned to test the aircraft's low-noise and handling characteristics at transonic speeds.

Boeing's X-48B Blended Wing Body technology demonstrator shows off its unique lines at sunset on Rogers Dry Lake adjacent to NASA's Dryden Flight Research Center. (Boeing photo # SMF06_F_KOEH_X48B-0900a)

A pristine blue sky backdrops the X-48B Blended Wing Body aircraft during the aircraft's first flight July 20, 2007, from NASA's Dryden Flight Research Center.

The unique manta-ray shaped planform of the Blended Wing Body X-48B is evidenced as the subscale demonstrator soars over Edwards AFB on its first test flight.

The X-48B Blended Wing Body research aircraft banks smartly in this Block 2 flight phase image.

Making a nice landing, the X-48B Blended Wing Body research aircraft team ends another successful Block 2 flight.

Boeing's sub-scale X-48B Blended Wing Body aircraft flies over the edge of Rogers Dry Lake at Edwards Air Force Base during its fifth flight on Aug. 14, 2007.

Boeing's X-48B Blended Wing Body technology demonstrator shows off its unique lines at sunset on Rogers Dry Lake adjacent to NASA's Dryden Flight Research Center. (Boeing photo # SMF06_F_KOEH_X48B-0955)

This rear-quarter view shows off the unique lines of Boeing's X-48B Blended Wing Body technology demonstrator on Rogers Dry Lake adjacent to NASA Dryden.

This modified F/A-18A is the test aircraft for the Active Aeroelastic Wing (AAW) project at NASA's Dryden Flight Research Center, Edwards, California.

This modified F/A-18A is the test aircraft for the Active Aeroelastic Wing (AAW) project at NASA's Dryden Flight Research Center, Edwards, California.

This modified F/A-18A is the test aircraft for the Active Aeroelastic Wing (AAW) project at NASA's Dryden Flight Research Center, Edwards, California.

This modified F/A-18A is the test aircraft for the Active Aeroelastic Wing (AAW) project at NASA's Dryden Flight Research Center, Edwards, California.

NASA aircraft technician Donte Warren completes placement of the first official U.S. Centennial of Flight Commission logo on an aircraft, Dryden's Active Aeroelastic Wing (AAW) F/A-18.

NASA aircraft technician Don Herman completes placement of the first official U.S. Centennial of Flight Commission logo on an aircraft, Dryden's Active Aeroelastic Wing (AAW) F/A-18.

This look-down view of the X-36 Tailless Fighter Agility Research Aircraft on the ramp at NASA’s Dryden Flight Research Center, Edwards, California, clearly shows the unusual wing and canard design of the remotely-piloted aircraft.

Lit by the rays of the morning sunrise on Rogers Dry Lake, adjacent to NASA's Dryden Flight Research Center, Edwards, California, technicians prepares the remotely-piloted X-36 Tailless Fighter Agility Research Aircraft for its first flight on May 17, 1997.

The lack of a vertical tail on the X-36 technology demonstrator is evident as the remotely piloted aircraft flies a low-altitude research flight above Rogers Dry Lake at Edwards Air Force Base in the California desert on October 30, 1997.

Lit by the rays of the morning sunrise on Rogers Dry Lake, adjacent to NASA's Dryden Flight Research Center, Edwards, California, a technician prepares the remotely-piloted X-36 Tailless Fighter Agility Research Aircraft for its first flight on May 17, 1997.

Lit by the rays of the morning sunrise on Rogers Dry Lake, adjacent to NASA's Dryden Flight Research Center, Edwards, California, technicians prepare the remotely-piloted X-36 Tailless Fighter Agility Research Aircraft for its first flight in May 1997.

The X-36 technology demonstrator shows off its distinctive shape as the remotely piloted aircraft flies a research mission over the Southern California desert on October 30, 1997.

As the sun creeps above the horizon of Rogers Dry Lake at NASA's Dryden Flight Research Center, Edwards, California, technicians make final preparations for the first flight of the X-36 Tailless Fighter Agility Research Aircraft.

The tailless X-36 technology demonstrator research aircraft cruises over the California desert at low altitude during a 1997 research flight.

The unusual lines of the X-36 technology demonstrator contrast sharply with the desert floor as the remotely piloted aircraft scoots across the California desert at low altitude during a research flight on October 30, 1997.

The X-36 technology demonstrator shows off its distinctive shape as the remotely piloted aircraft flies a research mission over the Southern California desert on October 30, 1997.

A collection of NASA's research aircraft on the ramp at the Dryden Flight Research Center in July 1997: X-31, F-15 ACTIVE, SR-71, F-106, F-16XL Ship #2, X-38, Radio Controlled Mothership and X-36.