Editing Silverstein Committee (section)

==Saturn emerges==

The Saturn C vehicles imagined in the Silverstein Committee report were never built. As soon as the Saturn became a NASA-tuned design of high performance, the DoD became less interested in it for their own needs. Development of the Titan continued for these roles, and as a result the flexibility offered by the variety of Saturn C-model intermediate stages simply wasn't needed, and were eventually abandoned.

All that survived of the recommendation was the S-I first stage and the smallest of the new upper stages, the S-IV. It was originally intended that the S-IV would be equipped with four upgraded Centaur engines, but to decrease risk it was decided to use the existing engines and increase their number from four to six. A new, larger engine, the [[J-2 (rocket engine)|J-2]], was already in the pipeline that could replace these. The original S-IV design, the 220-inch with six engines, was used only for a short period until a larger diameter 260-inch version was created for the Saturn Block II models, and then finally replaced with the J-2 powered S-IVB of the [[Saturn IB]].