Pratt & Whitney Rocketdyne :: Propulsion Solutions :: Space Launch

Overview

One of the most consistent and successful launch records in history.

The nominal 200,000 lb. sea-level thrust RS-27A powers the Delta II launch vehicle and 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 power plant 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 tubes that comprise the thrust 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.

Characteristics

RS-27A Engine

Propellants
Fuel:	RP-1
Oxidizer:	LOX
Thrust
Vacuum:	237,000 lb.
Sea Level:	200,000 lb.
Specific Impulse
Vacuum:	302 sec.
Sea Level:	255 sec.

Area Ratio:	12:1

Chamber Pressure:	700 psia

Engine Mixture Ratio:	2.2

Dimensions
Length:	149 in.
Diameter:	67 in.

Weight:	2,530 lb.