RS-27A

The RS-27 was a liquid-propellant rocket engine developed in 1974 by Rocketdyne to replace the aging MB-3 in the Delta. Incorporating components of the venerable MB-3 and the H-1 designs, the RS-27 was a modernized version of the basic design used for two decades. It was used to power the first stage of the Delta 2000, 3000, 5000, and the first model of the Delta II, the Delta 6000.

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rocket engine, 
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Frameless

The first stage of a Delta II rocket, showing the RS-27A main engine, is lifted into place at Vandenberg Space Force Base in California.

Type	Subtype	Date	Description	Notes	Source
commons	image		The first stage of a Delta II rocket, showing the RS-27A main engine, is lifted into place at Vandenberg Space Force Base in California.		Commons