S-IV

The S-IV was the second stage of the Saturn I, a rocket-powered launch vehicle used by NASA for early flights in the Apollo program.

The S-IV is similar to, but distinct from, the S-IVB stage used on the Saturn IB and Saturn V rockets.

See also

S-IV stage of the Saturn I

References

NASA (April 1975). "Apollo Program Summary Report, Part 1" (PDF).