dsc17127.jpg

Detail of the aft end of the S-II thrust structure.

On the thrust structure, on each end point of the "X"-shaped center engine support, are engine mounts.

The silver cylindrical component behind the center engine support is the LOX sump; on a flight stage, LOX feed lines would lead to each J-2 engine mount. However, as this S-II stage is the Dynamic Test Vehicle, these lines are replaced by mass simulators (white beams leading from behind each engine mount almost to the LOX sump).