Page 21 - Apollo Moonships

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1 S–IC FIRST STAGE Fuel hose
Fuel tank
2 S–II SECOND STAGE
Retrorocket
INTERSTAGE SKIRT
This truncated cone joined the S-IVB and S-II booster stages and worked as a load-bearing structure..
3 S–IVB THIRD STAGE Panel
ADAPTER
The Spacecraft Lunar Module Adapter (SLA) provided protection and structural attachment to the LEM during the launch of the Saturn V rocket.
Ladder
Forward skirt
S–IC BOOSTER STAGE
This stage provided the initial boost to the Saturn launch vehicle. Its five liquid propellant F-1 rocket engines provided acceleration to increase the speed to over 7 000 feet per second.
Fuel line
Fuel tank
Forward skirt
Instruments
INSTRUMENT UNIT
This aluminum-alloy ring contained the guidance, navigation, and control systems that guided the Saturn V rocket through the Earth’s orbit.
FINS AND FAIRINGS
Fairings were fitted over each of the four outboard F-1 engines to smooth the airflow. Airfoil fins were attached to the fairings.
S–II STAGE
The S-II stage provided a second boost for the Saturn V launch vehicle, powered by five J-2 engine rockets.
F–1 engine
INTERSTAGE RING
In addition to its structural support function, the interstages also served as electrical and mechanical interface between the booster stages.
Fuel line
Fuel tank
Aft skirt
J–2 engine
S–IVB STAGE
Retrorocket
Powered by a single J-2 rocket engine, the S-IVB stage was designed to boost its payload twice: to the Earth’s orbit on the first burn and to the moon (translunar injection) on a second burn.
Aft skirt
Forward skirt
Auxiliary Propulsion
System (APS) J–2 engine