The S-IV was the second stage of the
Saturn I, a rocket-powered launch vehicleused by NASAfor early flights in the Apollo program.
The S-IV is similar to, but distinct from, the later
S-IVBstage used on the Saturn IBand Saturn Vrockets.
The S-IV stage was a large LOX/LH2-fueled rocket stage used for the early test flights of the Saturn I rocket. It formed the second stage of the Satun I and was powered by a cluster of six
RL-10engines. The cryogenic LH2 ( liquid hydrogen) and LOX ( liquid oxygen) tanks were separated by a common bulkhead. The forward bulkhead of the LOX tank formed the aft bulkhead of the LH2 tank. This saved about ten tons of structural weight.
Height: 12.19 m
Diameter: 5.49 m
Engines: 6 RL-10
Thrust: 400 kN
Fuel: liquid hydrogen (LH2)
Oxidizer: liquid oxygen (LOX)
Burn time: approx. 410 s
Burnout altitude (for Saturn I): up to 450 km
S-IV stage of the Saturn I
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