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Delta IV Medium, coded Delta 9040, was the most basic Delta IV. It featured a single CBC and a modified Delta 3 second stage, with 4-meter liquid hydrogen and liquid oxygen tanks (called a Delta Cryogenic Second Stage (DCSS)) and a 4-meter payload fairing. The Delta IV Medium was capable of launching 4,200 kg to geostationary transfer orbit ...
The Delta IV Medium (Delta 9040) was the most basic Delta IV. It featured a single CBC and a modified Delta III second stage, with 4-meter liquid hydrogen and liquid oxygen tanks (called a Delta Cryogenic Second Stage (DCSS)) and a 4-meter payload fairing. The Delta IV Medium was capable of launching 4,200 kg to geostationary transfer orbit ...
The Delta IV originally had two main versions which allowed the family to cover a range of payload sizes and masses: the Medium (which had four configurations) and Heavy. [2] Since September 2019, only the Heavy remained active, with payloads that would previously fly on Medium moving to either the existing Atlas V or the forthcoming Vulcan .
The Delta IV Heavy (Delta 9250H) was an expendable heavy-lift launch vehicle, the largest type of the Delta IV family. It had the highest capacity of any operational launch vehicle in the world after the retirement of the Space Shuttle in 2011 until the Falcon Heavy debuted in 2018, and it was the world's third highest-capacity launch vehicle ...
Delta IV-M CCAFS SLC-37B USA-167 (DSCS-3 A3) Classified GTO: US Air Force: Success [21] Military communications satellite, First Delta IV Medium launch, First USAF EELV mission 297 March 31, 2003 22:09 Delta II 7925-9.5 CCAFS SLC-17A USA-168 2,032 kg MEO: US Air Force: Success [22] Navigation satellite 298 June 10, 2003 17:58 Delta II 7925-9.5
The Delta Cryogenic Second Stage (DCSS) is a family of cryogenic-fuelled rocket stages used on the Delta III, Delta IV, and on the Space Launch System Block 1 launch vehicles. The DCSS employs a unique two-tank architecture where the cylindrical liquid hydrogen (LH 2 ) tank carries payload launch loads and forms the upper section.
Delta IV CBCs and DCSSs were integrated horizontally before being transported to the launchpad. The Delta IV Medium retired after the 22 August 2019 launch of a GPS-III satellite. The mission used a Delta IV M+(4,2) two SRBs, and a 4 m diameter DCSS and payload fairing, the final use of the 4 m fairing. [33] [34]
As of October 2018, only the Delta IV remains in production. Single-stick versions of Delta IV was retired by United Launch Alliance (ULA) in 2019 and replaced by the ULA Atlas V, leaving the Delta IV Heavy the only remaining operational member of the Delta family, flying US national security missions.