
The first flight of a large aircraft to be powered by electric fuel cells began with a takeoff at 8:43…

The Helios Prototype is an enlarged version of the Centurion flying wing, which flew a series of test flights at…

The long, slender wing of the Perseus B remotely piloted research aircraft can be clearly seen in this photo, taken…

A long, slender wing and a pusher propeller at the rear characterize the Perseus B remotely piloted research aircraft, seen…

A large, controllable-pitch pusher propeller at the rear is a distinctive feature of the Perseus B remotely piloted research aircraft,…

A long, slender wing and a pusher propeller at the rear characterize the Perseus B remotely piloted aircraft, seen here…

The Perseus B high-altitude, remotely piloted research vehicle touches down on the runway at Edwards AFB, adjacent to NASA’s Dryden…

The Perseus proof-of-concept vehicle flies over Rogers Dry Lake at the Dryden Flight Research Center, Edwards, Calif., to test basic…

The Perseus proof-of-concept vehicle in flight at the Dryden Flight Research Center, Edwards, Calif. in 1991.

The Perseus B remotely piloted aircraft on the runway at Edwards Air Force Base, Calif. at the conclusion of a…