The Saturn IB-B was a proposed modification to the Saturn IB rocket, it was to be essentially an uprated version of the Saturn IB using the new MS-IVB-2 upper stage powered by the HG-3 engine developed from the S-IVB and an uprated S-IB-A first stage. It was Proposed by Douglas Studies in 1965 but it never passed the drawing board.
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This article is an automated import of the Wikipedia article "Saturn IB-B", available at https://en.wikipedia.org/wiki/Saturn_IB-B . Text is licensed under CC BY-SA 4.0.