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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 ...
Delta IV Medium+ (4,2), coded Delta 9240, had the same CBC and DCSS as the Medium, but with the addition of two Orbital ATK-built 1.5-m (60-in) diameter solid rocket booster Graphite-Epoxy Motors (GEM-60s) strap-on boosters to increase payload capacity to 6,150 kg to GTO.
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 second stage and fairing were taken from the Delta III in smaller (Delta IV Medium) models; widened to 5 metres in Medium+ and Heavy models. Medium+ models had two or four GEM 60, 60-inch-diameter (1.5 m) solid boosters. The plumbing was revised and electrical circuits eliminated need for a launch tower.
For the Delta IV Medium configuration, a tapering interstage was employed to transition between the 5-meter diameter of the first stage and the smaller 4-meter diameter of the DCSS. In contrast, the Delta IV Heavy configuration and some Delta IV Medium+ configurations, with larger payload capacities, utilized a cylindrical interstage that ...
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
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]
This is a list of launches made by the PGM-17 Thor IRBM, and its derivatives, including the Delta family and the Japanese N-I, N-II and H-I rockets which were based on license-produced components. Due to the number of launches, it has been split by decade: List of Thor and Delta launches (1957–1959) List of Thor and Delta launches (1960–1969)