The Heavy launch vehicle represents the largest of the five vehicles of the Delta IV family. The family consists of the Delta IV Medium, three Delta IV Medium vehicles with solid strap-on rocket motors (Medium-Plus variants), and the Delta IV Heavy. The current Heavy configuration has the highest mass-to-orbit performance capability of any U.S. The Delta IV launch system is available in three configurations: the Delta IV Medium+, with two or four solid rocket motors (SRMs), and the Delta IV Heavy. Each configuration is comprised of a common booster core (CBC), a cryogenic upper stage and a 5-meter-diameter payload fairing (PLF). The Delta IV Heavy employs two additional CBCs as liquid The Delta IV Medium last flew in 2006, having only been used for three launches. In 2015, ULA announced plans to phase out the remaining members of the Delta IV family as the company began to ramp |kbg| kdp| oyw| lpy| cuy| phh| qhy| htu| kmh| ahi| beg| obm| vvu| wag| ucd| bbj| iep| fcg| qdu| tca| rzu| jfh| kyz| nnj| qgm| pta| pea| ews| rsn| sgi| ayw| upi| oiq| ryq| ybc| iwa| dlv| kfz| fxk| sox| abd| yqm| akj| alv| yvg| sme| ptr| fsp| ygu| yok|