Upgraded Rocket Motors To Power Delta IV Heavy Lift
Booster
United Launch Alliance announced Thursday the successful first
hot-firing of the new Pratt & Whitney Rocketdyne RS-68A engine
that will be used to power a future upgraded version of the Delta
IV Heavy Lift launch vehicle. The hot-fire test was conducted 3:16
pm CDT, at NASA's John C. Stennis Space Center in Mississippi.
Stennis is the home of America's largest rocket engine test
facility.