Suntan

The largest and most extraordinary project for using hydrogen as a fuel was carried out by the Air Force in 1956-1958 in supersecrecy. The project was code-named Suntan, and even this was kept secret. Suntan was an effort by the Air Force to develop a hydrogen-fueled airplane with performance superior to the secret spy plane, the U-2. The aircraft and engine design for this project is reviewed. Due to technological problems and conflicting technical views over its feasibility and the best way to accomplish reconnaissance, the Suntan project simply faded away and was cancelled in 1959.