US unveils high-tech B-21 stealth bomber

US unveils high-tech B-21 stealth bomber
US unveils high-tech B-21 stealth bomber

The United States unveiled the B-21 Raider, a high-tech stealth bomber that can carry nuclear and conventional weapons and is designed to be able to fly without a crew on board.

The slickly choreographed ceremony at B-21 manufacturer Northrop Grumman's facility in Palmdale, California opened with the US national anthem as older bombers roared over a crowd that included top US officials.

Dramatic music played and lights flashed as the doors of a hanger holding the new aircraft slowly opened, and the crowd applauded as the cloth covering it was pulled away to reveal a sleek grey bomber that is on track to cost nearly $700 million per plane.

"The B-21 Raider is the first strategic bomber in more than three decades. It is a testament to America's enduring advantages in ingenuity and innovation," US Defense Secretary Lloyd Austin said in remarks at the ceremony.

Many specifics of the aircraft are being kept under wraps, but the plane will offer significant advances over existing bombers in the US fleet, which Austin highlighted in his remarks.

He hailed its range -- "no other long-range bomber can match its efficiency" -- and its durability, saying it is "designed to be the most maintainable bomber ever built."

Like the F-22 and F-35 warplanes, the B-21 features stealth technology, which minimises an aircraft's signature through both its shape and the materials it is constructed from, making it harder for adversaries to detect.