Enhanced rocket engine to power Delta 4 first stage Wednesday

Using a new, uprated main engine for the first time on a rocket of its kind, a United Launch Alliance Delta 4-Medium+ vehicle will soar into space Wednesday night carrying a $566 million Air Force communications satellite. The enhanced RS-68A main engine will power the medium-lift rocket off the pad at Cape Canaveral’s Complex 37 with the Wideband Global SATCOM satellite No. 7 bound for a super-synchronous transfer orbit. The evening’s launch opportunity extends from 8:07 to 8:46 p.m. EDT. Weather forecasters are projecting a 60 percent chance of favorable conditions for launch, with clouds and lightning the primary concerns. More

(Source: SpaceFlight Now - Jul 20)