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The RS-68A is an updated version of the RS-68, with increased specific impulse and thrust (to over 700,000 pounds-force (3,100 kN) at sea level). [11] The first launch on 29 June 2012, from the Cape Canaveral Air Force Station used three RS-68A engines mounted in a Delta IV Heavy rocket. [12]
Engine Origin Designer Vehicle Status Use Propellant Power cycle Specific impulse (s) [a] Thrust (N) [a] Chamber pressure (bar) Mass (kg) Thrust: weight ratio [e] Oxidiser: fuel ratio
All following launches used the RS-68A, [21] and the engine's higher thrust allowed the use of a single standardized CBC design for all Delta IV Medium and M+ versions. This upgrade reduced cost and increased flexibility, since any standardized CBC could be configured for zero, two, or four solid-propellant rocket boosters.
First flight with RS-68A engines, ELINT satellite 361 4 October 2012 12:10 ... Final launch of baseline RS-68 engine, [30] Navigation satellite 372 24 July 2015
Second flight with an RS-68A engine; New standard for Delta IV rockets, Military comsat: 23 10 February 2016, 11:40 Delta IV Medium+ (5,2) VAFB SLC-6: USA-267 (NROL-45)
SEWS (68A: Uses a Singer) The capital "S" alerts solvers that Singer is a brand name here. Singer as in the sewing machine manufacturer. AUSTEN (3D: Jane who wrote "Mansfield Park") ...
The Delta IV Heavy launch vehicle used three Common Booster Cores (CBCs) each powered by a Pratt and Whitney Rocketdyne RS-68A engine, a Delta Cryogenic Second Stage 5 m (DCSS) powered by an RL10, and a 5 m payload fairing.
The Delta IV Heavy (Delta 9250H) was an expendable heavy-lift launch vehicle, the largest type of the Delta IV family. It had the highest capacity of any operational launch vehicle in the world after the retirement of the Space Shuttle in 2011 until the Falcon Heavy debuted in 2018, and it was the world's third highest-capacity launch vehicle in operation at the time of its retirement in 2024.