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The Atlas II was the last Atlas rocket to use the "stage-and-a-half" technique, where it ignited all 3 RS-56 engines at liftoff and then jettisoned the 2 RS-56-OBA side engines and their support structure during ascent. The two RS-56-OBA engines were integrated into a single unit called the MA-5A and shared a common gas generator.
The resulting conceptual heavy-lift vehicle was called "Atlas Phase 2" or "PH2" in the 2009 Augustine Report. An Atlas V PH2-Heavy (three 5 m stages in parallel; six RD-180s) along with Shuttle-derived , Ares V and Ares V Lite, were considered as a possible heavy lifter concept for use in future space missions in the Augustine Report. [ 29 ]
Most liquid engines use a bipropellant, consisting of two liquid propellants (fuel and oxidizer) which are stored and handled separately before being mixed and burned inside the combustion chamber. Hybrid-propellant rockets use a combination of solid and liquid propellant, typically involving a liquid oxidizer being pumped through a hollow ...
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OSTF-2 (also designated Site G or 576 Golf) [4] hosted seven Atlas F launches between 1962 and 1965. This facility received its own baptism of fire on 4 October 1963 when Missile 45F tipped over at liftoff after one engine failed to start. Damage to the silo was not that serious and it hosted the final Atlas R&D flight two months later.
The Titan I Weapon System 107A-2 program was pursued initially as insurance against the SM-65 Atlas possible failure, but it enjoyed many technological refinements that had been deliberately left out of the Atlas to avoid delays in the Atlas deployment – The Titan I was also known as the XSM-68 (Xperimental Strategic Missile 68) while it was ...
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