I've read of many weird and wonderful concepts in aviation over the course of its existence, but this one's both new to me and weirder than most! Livescience reports:
An aircraft that resembles a four-point ninja star could go into supersonic mode by simply turning 90 degrees in midair. The unusual "flying wing" concept has won $100,000 in NASA funding to trying becoming a reality for future passenger jet travel.
The supersonic, bidirectional flying wing idea comes from a team headed by Ge-Cheng Zha, an aerospace engineer at the University of Miami, and including collaborators from Florida State University. He said the fuel-efficient aircraft could reach supersonic speeds without the thunderclap sound produced by a sonic boom — a major factor that previously limited where the supersonic Concorde passenger jet could fly over populated land masses.
. . .
Zha's bidirectional flying wing ... essentially lay[s] two flying wings on top of one another at a 90 degree angle, so that the aircraft faces one way for subsonic flight and rotates another way for supersonic flight.
The midair transformation allows the aircraft to fly in its most fuel-efficient modes at both subsonic and supersonic speeds, Zha explained. Jet engines located on top of the aircraft in concept illustrations appear to rotate independently of the aircraft so that they can always point forward in flight.
There's more at the link. Here's a University of Miami computer graphics video of the concept (with apologies for their ghastly choice of music!).
Dr. Zha has other videos on YouTube, including a two-year-old five-part series discussing his supersonic flying wing: click the links for Part 1, Part 2, Part 3, Part 4 and Part 5. He foresees a bright future for aviation in the USA.
I must admit, I'd never considered an aircraft that can turn 90° in mid-air like that. I've no idea whether it's practically possible, given that it's only a theory at present; but if Dr. Zha can make it work, I guess the sky really is the limit! Only problem is, if a shuriken-shaped aircraft is involved in a mid-air collision, you know who's going to be blamed . . .