Apollo Saturn User Manual download pdf (Page 51)

S-If STAGI" STRUCTURE

The S-II stage ib a large cy]Indrlcal booster approximately 8] feet in length

and 33 feet in diameLer. The _tag¢: is powered by five llquid-prop=l]cd J-2 rocket

engln-7, _'bich combine to develop a total thrust of 1,i50,000 pounds.

Forward Shirt

_he forward skirt, z, part of the S-If body shell structure, is a cylindrical

aluminum alloy material, strenghened and supported internally and externally '

stringers and circumferential ring frames, the fo£ward skirt also houses the

Lelemetry and command (range safety) antennne.

, The Fu_Tank

The LH2 tank ts a long cylinder with a concave bulkhead forward and a con-

vex bulkhead aft. The tank structure is made up of six cylindrical sections which

incorporate stlffonlng members in both the ]ongitudlnal and circumferential

directions.

The /:on=on Bulkhead

This is an adhesive-bonded assembly of aluminum alloy and flberglass/phenolic

honeycor_b core to prevent, heat transfer and retain the cryogenic properties of the

fluids to which it is exposed (LOX and LH2). Fiberglass core materiel varies in

thickness between .080 inches to 5 inches. No connections or lines pass through

_he common bulkhead.

The LOX Tank

_ha LOX tank consists of _.!lipsoidal fore and aft halves with reinforced

gore segments. Three ring type slosh baffles control propellant sloshing and

minimize surface disturbances. A six part sump assembly at the lowest point

provides fili and drain openings for the five engine feed lines,

Aft Int_

The aft interstsge, also part of the body shall structure, is made up of

aluminum alloy mater_al and is supported internally by hat stringers and circum-

t ferential ring frames. The af_ inter,_tage has four ullage rockets mounted in its

outeg surface,

System Tunnel ,.

The systems tunnel houses el_ctrlcal cables, pressuri_atlon llnes and the

propellant dispersion ordn_aca, The runnel is attached externally from the $-I! ,.

stage aft skirt to the forward skirt,

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Apollo Saturn User Manual Page 51