Saturn I Block II Boattail

Diagram of the boattail of the Block II S-I stage (crop of my Saturn I Block II Inboard Profile).

Saturn I Block II S-I stage inboard profile boattail

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Taken from page 11/3-/11-4 of Apollo systems description. Volume 2 - Saturn launch vehicles (p. 338 & 339 in the pdf).
Extraction, reconstruction, and cleanup by