Suntan was the code-name of a prototype reconnaissance aircraft program with the goal of creating a much faster and higher-altitude successor to the U-2 enabled by the use of liquid hydrogen (LH2) as fuel. From 1956-1958 the United States Air Force funded a highly secretive program of research and development on the aircraft and engine design and made significant investments in large-scale LH2 production.
Made by Lockheed Corporation.