RD-120
Versions

RD-120

Section Title: Versions
Table Section Text: None

Name	RD-120	RD-120 (augmented thrust)	RD-120K	RD-870

AKA	11D123	11D123 11D123M?

Development years	1976–1985	2001–2003	1986–	2016–

Engine Type	Oxidizer Rich Stage Combustion upper stage liquid rocket engine

Propellant	RG-1/LOX (O/F 2.6)

Chamber Pressure	16.28 MPa (2,361 psi)	17.81 MPa (2,583 psi)	17.63 MPa (2,557 psi)	16 MPa (160 kgf/cm2)

Thrust (Vac)	833.6 kN (187,400 lbf)	912 kN (205,000 lbf)	853.2 kN (191,800 lbf)	867.5 kN (88.46 tf)

Thrust (SL)	N/A	N/A	784.5 kN (176,400 lbf)	781 kN (79.6 tf)

Isp (Vac)	350 s (3.4 km/s)	350 s (3.4 km/s)	330 s (3.2 km/s)	332 s (3.26 km/s)

Isp (SL)	N/A	N/A	304.4 s (2.985 km/s)	298 s (2.92 km/s)

Throttle	70–110%	70–110%	50–105%	98.5–101.5%

Nozzle Expansion	114.5	114.5	49.6	N/A

Burn time	290 seconds	290 seconds	305 seconds	200 seconds

Engine life	2,200 seconds	2,200 seconds	2,200 seconds	N/A

Length	3,872 mm (152.4 in)	3,872 mm (152.4 in)	2,435 mm (95.9 in)	2,746 mm (108.1 in)

Diameter	1,954 mm (76.9 in)	1,954 mm (76.9 in)	1,400 mm (55 in)	1,436 mm (56.5 in)

Weight	1,125 kg (2,480 lb)	1,125 kg (2,480 lb)	1,080 kg (2,380 lb)	1,280 kg (2,820 lb)

Used on	Zenit-2 Second Stage	Zenit-3SL Second Stage	Project	Cyclone-4M First Stage

First Launch	1985-04-13	1999-03-28	N/A	N/A

Status	In Production	In Production	Project	Project

References

Sentence(s)

The RD-120 (11D123) is a oxidizer rich staged combustion upper stage liquid rocket engine and RG-1/LOX with an O/F ratio of 2.6.

final_sentence: The RD-120 (11D123) is a oxidizer rich staged combustion upper stage liquid rocket engine and RG-1/LOX with an O/F ratio of 2.6.