Image: J-2 rocket engine

Description: This chart is an illustration of J-2 Engine characteristics. A cluster of five J-2 engines powered the Saturn V S-II (second) stage with each engine providing a thrust of 200,000 pounds. A single J-2 engine powered the S-IVB stage, the Saturn IB second stage, and the Saturn V third stage. The engine was uprated to provide 230,000 pounds of thrust for the fourth Apollo Saturn V flight and subsequent missions. Burning liquid hydrogen as fuel and using liquid oxygen as the oxidizer, the cluster of five J-2 engines for the S-II stage burned over one ton of propellant per second, during about 6 1/2 minutes of operation, to take the vehicle to an altitude of about 108 miles and a speed of near orbital velocity, about 17,400 miles per hour.
Title: J-2 rocket engine
Credit: http://mix.msfc.nasa.gov/IMAGES/HIGH/9801770.jpg linked from http://mix.msfc.nasa.gov/abstracts.php?p=1093
Author: NASA/Marshall Space Flight Center
Usage Terms: Public domain
License: Public domain
Attribution Required?: No