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The nominal 200,000 lb sea-level thrust RS-27, powering the Delta launch vehicle, has compiled one of the most consistent and successful launch records in the history of rocketry with a 100 percent reliability factor.
A single-start powerplant, it is gimbal-mounted and operates on a combination of liquid oxygen and RP-1 (kerosene). The thrust chamber is regeneratively cooled with fuel circulating through 292 tubes that comprise the inner wall of the chamber.
The RS-27A is the latest version of this propulsion system that includes a higher 12:1 area expansion ratio thrust chamber nozzle among other improvements. The RS-27A is used as the main booster propulsion system for the Delta II family of launch vehicles.
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