description Delta IV Medium+ (4,2) Overview
The Delta IV Medium+ (4,2) was an expendable orbital launch vehicle configuration operated by the United Launch Alliance as part of the Delta IV rocket family. It was distinguished by its use of a four-meter-diameter payload fairing paired with two GEM-60 solid rocket boosters strapped to the first stage. This configuration provided an intermediate payload capacity, sitting between the baseline Delta IV Medium and the more powerful five-meter fairing variants. The rocket was utilized for medium-lift satellite deployments before the Delta IV fleet was retired.
help Delta IV Medium+ (4,2) FAQ
What does the 4,2 designation mean on Delta IV Medium+?
The 4 refers to the 4-meter payload fairing and Delta Cryogenic Second Stage, while the 2 means the rocket used two GEM-60 solid rocket boosters. The configuration was also known as Delta 9240.
How much payload could Delta IV Medium+ (4,2) carry?
Its published capacity was about 6,150 kilograms to geostationary transfer orbit. That was substantially more than the basic Delta IV Medium, which did not use strap-on GEM boosters.
Who operated the Delta IV Medium+ (4,2)?
United Launch Alliance operated the vehicle for U.S. government and military missions. ULA was formed in 2006 as a joint venture between Boeing and Lockheed Martin.
How was the 4,2 version different from Delta IV Medium+ (5,2)?
Both versions used two GEM-60 boosters, but the 5,2 had a larger 5-meter fairing and upper stage. The 4,2 was better suited to payloads that did not require the wider 5-meter fairing.
explore Explore More
Reviews & Comments
Write a Review
Be the first to review
Share your thoughts with the community and help others make better decisions.
