Saturn I Block I Profile

Diagrams of the Block I S-I stage.

SA-1 Through SA-4 System Description, the document from which these diagrams were taken, is a very early document -- dated 2 April 1959, only 7½ months after the Saturn program was authorized, nearly a year before the first test firing of the SA-T stage, and two and a half years before the first Saturn flight. The document itself states that it "is preliminary and subject to change and addition ... The information contained herein is for general information only and should not be used as a final design criteria." Some of the items in these drawings did not make it to the final vehicle configuration:

Here, then, are the diagrams. All were taken from a barely-legible original copy and required reconstruction and painstaking clean-up.

Overall stage diagram. Section A-A, Section B-B, Section C-C, and a view of the base appear below.

Note that this diagram shows 8 XM-19 Recruit solid-fueled rockets at the aft end of the propellant tanks; these were meant to slow the stage's descent during recovery. It also mentions aspirators on the inboard engines. Neither of these features were representative of the final vehicle configuration (although if you zoom in on the S-I stage model in this famous picture of Wernher von Braun, you can see Recruits mounted around the thrust structure).

Block I Saturn I S-I stage profile diagram

Click image for a 5790x2250 pixel version of this image in a new window.
From "SA-1 Through SA-4 System Description". Located in the Saturn V Collection, Dept. of Archives/Special Collections, M. Louis Salmon Library, University of Alabama in Huntsville, which also makes this document available as a 88.9 megabyte PDF.
Scan, reconstruction, and cleanup by heroicrelics.org.


Section A-A, from the profile above. This section, forward looking aft, shows the spider beam, fuel system pressurization (including triplex spheres and fuel system vent), GOX line from heat exchanger (attached to fuel tank no. 4), and lox vent and relief valves (at Positions I and II, labelled "LOX vent" in this diagram).

Note that this diagram shows 51 nitrogen spheres, which is not representative of the final vehicle configuration.

Block I Saturn I S-I second stage adapter spider beam triplex nitrogen spheres profile diagram

Click image for a 2241x1961 pixel version of this image in a new window.
From "SA-1 Through SA-4 System Description". Located in the Saturn V Collection, Dept. of Archives/Special Collections, M. Louis Salmon Library, University of Alabama in Huntsville, which also makes this document available as a 88.9 megabyte PDF.
Scan, reconstruction, and cleanup by heroicrelics.org.


Section B-B, from the profile above. This section, forward looking aft, shows the second stage adapter and instrumentation canisters. The number of canisters varied slightly from one mission to the next; I believe this configuration reflects SA-1 and SA-2.

Note that this diagram shows recovery gear, which is not representative of the final vehicle configuration.

Block I Saturn I S-I stage second stage adapter profile

Click image for a 2406x2330 pixel version of this image in a new window.
From "SA-1 Through SA-4 System Description". Located in the Saturn V Collection, Dept. of Archives/Special Collections, M. Louis Salmon Library, University of Alabama in Huntsville, which also makes this document available as a 88.9 megabyte PDF.
Scan, reconstruction, and cleanup by heroicrelics.org.


Section C-C, from the profile above. This section, aft looking forward, shows the fuel and LOX manifolds (used to interconnect the four fuel tanks and the five LOX tanks, respectively) and the tank fill and drain connectors. At the test stand, each fuel tank and two of the LOX tanks had a fill and drain connector, while at the pad there was a single fuel and a single LOX fill and drain nozzle. The extra connectors at the test stand provided an emergency drain capability in the case of a fire.

The round connectors near the center of each propellant tank represent the engine feed lines; each outer propellant tank supplied propellant for one inboard and one outboard engine.

Block I Saturn I S-I stage fuel lox manifold tanks

Click image for a 2309x1922 pixel version of this image in a new window.
From "SA-1 Through SA-4 System Description". Located in the Saturn V Collection, Dept. of Archives/Special Collections, M. Louis Salmon Library, University of Alabama in Huntsville, which also makes this document available as a 88.9 megabyte PDF.
Scan, reconstruction, and cleanup by heroicrelics.org.


Base view. This section, aft looking forward, depicts a cut-away view of the base of the stage. Note especially how the fuel and LOX lines "wrap around" the engines.

I vaguely remember reading about some early Saturn flights trailing wires from the stage to relay information (perhaps acoustic measurements???) in the seconds around ignition and shortly after take-off; I assume that this is what the "2 trailing cables" item is.

Note that this diagram shows two short cable masts at Position I, retro-rockets on the thrust frame outriggers, and a LOX replenishment fitting on a thrust frame outrigger, which are not (or may not be) representative of the final vehicle configuration.

Block I Saturn I S-I stage aft view engine mount fuel LOX ducts

Click image for a 2188x1993 pixel version of this image in a new window.
From "SA-1 Through SA-4 System Description". Located in the Saturn V Collection, Dept. of Archives/Special Collections, M. Louis Salmon Library, University of Alabama in Huntsville, which also makes this document available as a 88.9 megabyte PDF.
Scan, reconstruction, and cleanup by heroicrelics.org.


I've also prepared three PDFs, containing cleaned-up copies of the original scans: