Delta IV
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Delta IV was a group of five expendable launch systems in the Delta rocket family. It flew 45 missions from 2002 to 2024. Originally designed by Boeing's Defense, Space and Security division for the E
Delta IV Medium launch carrying DSCS III-B6.
Delta IV Heavy launching
Delta IV 4-meter Cryogenic Second Stage
First Delta IV Heavy with three CBCs prior to launch
RS-68
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The RS-68 was a liquid-fuel rocket engine that used liquid hydrogen and liquid oxygen as propellants in a gas-generator cycle. It was the largest hydrogen-fueled rocket engine ever flown.
Delta IV
…payload fairing, all atop a single Common Booster Core (CBC). The Small variant was dropped by 1999. In 2002, the Delta IV was first launched, with the RS-68 becoming the first large liquid-propellant rocket engine designed in the United States since the Space Shuttle main engine (SSME) in the 1970s. The L3…
An RS-68 engine undergoing hot-fire testing at NASA's Stennis Space Center during its developmental phase.
RS-68A engines of Delta IV Heavy's Common Booster Cores.