ABSTRACT
Heat from the inrushing air served to warm up the cold and liquid hydrogen, which reverted to gas. The hydrogen gas then burned quite normally in the left jet engine. The plane again would carry liquid hydrogen tanks inside the fuselage structure fore and aft. In addition, the hydrogen aircraft are physically smaller in span and wing area, but characteristically have larger fuselages. One reason was that once the overall design was fixed there was not much room left to improve the plane's range, mainly because of the peculiar characteristics of liquid hydrogen. The plane again would carry liquid hydrogen tanks inside the fuselage structure fore and aft. Early designs that envisioned hydrogen carried in tanks mounted on top of each wing were abandoned. Lockheed wanted to convert four Tri-Star wide-body jets to liquid-hydrogen operation. A great deal of work also went into studying the much-feared, hazards of the fuel, including a large number of deliberate attempts to explode hydrogen.
