COLORADO SPRINGS — The main stage of NASA’s planned heavy-lift Space Launch System exploration rocket will carry four surplus RD-25D space shuttle main engines, as NASA and main-stage prime contractor Boeing move toward preliminary design review (PDR) on the big new rocket by the end of the year. With the first flight scheduled in 2017, Jim Chilton, Boeing vice president and program manager for exploration launch systems, calls the development schedule “sporty.” But selection of the ...
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