RS-27

RS-27

Country of origin	USA
Date	1974
Designer	Rocketdyne
Manufacturer	Rocketdyne
Application	Booster
Predecessor	H-1
Successor	RS-27A, RS-56
Status	Retired
Liquid-fuel engine
Propellant	LOX / RP-1
Cycle	Gas Generator
Configuration
Chamber	1
Performance
Thrust (vac.)	1,023 kN (230,000 lbf)
Thrust (SL)	971 kN (218,000 lbf)
Chamber pressure	4.9 MPa (49 bar)
Isp (vac.)	295 seconds (2.89 km/s)
Isp (SL)	264 seconds (2.59 km/s)
Burn time	274 Sec
Dimensions
Length	3.63 m (11.9 ft)
Diameter	1.07 m (3.51 ft)
Dry weight	1,027 kg (2,264 lb)
Used in
Delta 2000, 3000, 5000, 6000, first stage

The RS-27 is a liquid-propellant rocket engine developed by Rocketdyne. 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.

The RS-27 was a modified Rocketdyne H-1 from surplus engines built to power the first stage of the Saturn I and Saturn IB and replaced the MB-3 engine that had been used on previous versions of the Delta launcher. In addition to its main engine, the RS-27 included two vernier engines to provide vehicle roll control during flight.. RS-27 was later developed into the RS-27A, and RS-56.