Rocket engine

J-2

Rockets

Overview

The restartable LH2/LOX engine of the Saturn V second and third stages and the Saturn IB second stage; its S-IVB restart sent Apollo crews toward the Moon.

Components & hardware

Propellants

LH2 / LOX

Powers

Saturn IB

Saturn V

Knowledge connections

PowersSaturn IB
PowersS-II (Saturn V second stage)
PowersS-IVB (Saturn upper stage)
Uses propellantLH2 / LOX
PowersSaturn V

Sources

The primary and reference sources this topic draws on.

NASANational Aeronautics and Space Administration
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.