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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 in operation at the time of its retirement in 2024.
Delta IV Heavy launching. The Delta IV Heavy (Delta 9250H) combines a 5 m (16 ft) diameter DCSS and payload fairing with two additional CBCs. These are strap-on boosters which are separated earlier in the flight than the center CBC. As of 2007, a longer 5 meter diameter composite fairing was standard on the Delta IV Heavy, [26] with an aluminum ...
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 .
Mission diagram EFT-1 Rendering of Orion capsule and Delta IV upper-stage during EFT-1 Earth seen from the EFT-1 Orion spacecraft. The four-and-a-half-hour flight took the Orion spacecraft on two orbits of Earth. Peak altitude was approximately 5,800 kilometres (3,600 mi).
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 ...
Subsequently, it underwent modifications to support the Delta IV and Delta IV Heavy, which conducted ten successful missions between 2006 and 2022. In 2023, SpaceX secured a lease agreement for SLC-6, with plans to modify the facility for Falcon 9 and Falcon Heavy launches commencing in 2025.
[5] [6] The RS-68 was certified in December 2001 for use on Delta IV rockets. [7] An RS-68 was part of each Delta IV Common Booster Core. The largest of the launch vehicles, the Delta IV Heavy, used three CBCs mounted together. [8] The engine produced 758,000 pounds-force (3,370 kN) in a vacuum and 663,000 pounds-force (2,950 kN) at sea level ...
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.