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AEROSPACE ATLAS V 1. HUMAN-RATED EELV 1st MAR 2005 2nd DEC 2008 (3rd MAY 2009)←HUMAN-RATE RS-68 + RL 10 PERFORMANCE? ABORT? COST NO ATLAS V #: CDR ONLY (DELTA IV H FLOWN) RD 180 (RUSSIAN) [INITIAL REQUIREMENTS] NOTE=change in HR req w/ 2b2 [[?]] from 2-fault tolerance & 1-fault w/ abort USED= 1ST STAGE existing DL IV H RS68B ←already planned for ares V 2ND STAGE: version of atta 2nd stage RL10 NEED TO PULL RS68B forward (originally intended for ares V) [4 reduce pres H] RL10 issuse: DELTA IV H [[?]] plastically deforms @ most thrust STAGE 2 OPTIONS (CONFIGS) LOOKED AT OPTIONS / HR DELTA IV H 2nd STAGE 4 engine IV H stage 2 ares I stage 2 HR J-2X stage 2 no stage 2 USED ~6+ CONFIGS TO ASSES •ALL CONFIGS MEET ABORT REQ. •ALL BUT #6 HAVE PERF→ISS (>ares 1) (#6 = reduced thrust + 16.8K# •CONFIGS 4→BEST BLEND, SO USED IN REST OF STUDY •LAUNCH OPS + PROCESSING OPTIONS NEW PAD @SLC 37 USE SLC 37A (W/AF) USE 39B MORE CONSERVATIVE W/ NEW ARCH. REQ ID