LiveScience.com/Ge-Chen
Zha | Florida State University - A flying wing aircraft design
resembling a ninja star can turn 90 degrees in midair to go into
supersonic mode.
Supersonic Flying Wing Nabs $100,000 from NASA - 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. 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.
"I am hoping to develop an environmentally friendly and economically
viable airplane for supersonic civil transport in the next 20 to 30
years," Zha said. "Imagine flying from New York to Tokyo in four hours instead of 15 hours."
The U.S. military's B-2 Spirit stealth bomber that debuted in 1989
represents the only previously successful flying wing aircraft, even
though experimental flying wings flew before then. Zha's bidirectional
flying wing kicks the general concept up a notch by essentially laying
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.
Such midair spinning might sound unpleasant for people riding the
aircraft. But a five-second rotation would only cause pilots and
passengers to experience a "g-force" just one-tenth the force of gravity
— less than what airline passengers experience during takeoff.
NASA liked the idea enough to give Zha and his colleagues a $100,000
grant from the Innovative Advanced Concepts program. But the U.S. space
agency does not expect such funded concepts to fly for at least another
20 years or so.
"We are inventing the ways in which next-generation aircraft and
spacecraft will change the world and inspiring Americans to take bold
steps," said Michael Gazarik, director of NASA's Space Technology
Program.
The bidirectional flying wing aircraft could also lead to the first
supersonic drones soaring over the U.S. homeland or distant
battlefields. Zha previously pitched the robotic military version to the
U.S. Air Force at an unmanned aerial systems conference in 2009.
Both the U.S. government and aircraft manufacturers also have begun
pushing for hypersonic aircraft capable of flying more than five times
the speed of sound (Mach 5). Aerospace giant EADS displayed one passenger jet concept at the Paris Air Show in 2011, but aviation experts suggested a ticket to board the flight would cost at least $10,000.
The U.S. has already begun carrying out tests of unmanned hypersonic aircraft, but with mixed results. A U.S. Air Force test of the unmanned X-51A WaveRider ended prematurely when the aircraft plunged into the Pacific Ocean on Aug. 14. ( LiveScience.com )
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