Delta II 7425

Delta 7425

Mission Profile

The Delta II 7425 was a two-to-three-stage variant of the Delta II family featuring four strap-on solid rocket boosters and an optional solid kick motor, designed for medium-weight payloads requiring precise orbit insertion at lower cost than the maximum-performance nine-booster variant. Standing 38.9 m tall with a 2.4 m diameter and a liftoff mass of 184 tonnes, it generated 2,966 kN of combined thrust and could deliver 3,382 kg to low Earth orbit. First flying in December 1998, the 7425 configuration was used for Earth observation and scientific satellite missions where the six- and nine-booster variants offered either too much or too much infrastructure for the target orbit.