Vicker's New Experimental Plane - First pictures of the new supermarine 525 experimental aircraft.The supermarine 525 made its first flight recently piloted by Vickers Armstrong's chief test pilot Mr. M. J. Lithgow, who flew the aircraft for more than 20 minutes and described the flight as "completely successful".The plane, which has been described as the fastest and most powerful aircraft ever designed for aircraft carrier operations, is powered by two rolls-royce avon engines *****. May 06, 1954. (Photo by Paul Popper, Paul Popper Ltd.).