Atlas-Centaur, Propulsion

Propulsion Atlas-Centaur

Block MA-5A

Variants of the "stage and a half" drive system (MA)

Castor IVA

Stage	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Stage	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
Booster	TX-780	452.2	2332	507.8	2618	10.101	52.1	0.1939	26.4

MA-2
Atlas LV-3C

Stage	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Stage	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
0	LR-89-NA-5	1,334.5	2432	1,517.4	2765	71.60	130.5	0.5487	198.0
1	LR-105-NA-5	253.1	2108	366.1	3050	42.05	337.4	0.1200	123.5
1	+ LR-101 (2)	8.9	1952	11.1	2442		340	0.0046	3.8

MA-5
Atlas SLV-3C

Stage	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Stage	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
0	LR-89-NA-7	1,645.9	2530	1,863.4	2865	89.97	138.3	0.6505	257.7
1	LR-105-NA-7	268.7	2161	385.2	3099	31.68	245	0.1243	94.4
1	+ LR-101 (2)	8.9	1952	11.1	2442		245	0.0046	2.8

Atlas SLV-3D

Stage	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Stage	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
0	LR-89-NA-7	1,679.2	2541	1,901.6	2877	93.38	141.3	0.6609	268.7
1	LR-105-NA-7	268.7	2161	385.2	3099	30.33	241.3	0.1243	93.0
1	+ LR-101 (2)	8.9	1952	11.1	2442		240	0.0046	2.7

Atlas G, Atlas I

Stage	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Stage	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
0	LR-89-NA-7	1,679.2	2541	1,901.6	2877	104.52	158.2	0.6609	300.7
1	LR-105-NA-7	268.7	2161	385.2	3099	33.01	256.1	0.1243	98.7
1	+ LR-101 (2)	8.9	1952	11.1	2442		255	0.0046	2.9

MA-5A
Atlas II, IIA

Stage	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Stage	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
0	RS-56-OBA	1,906.0	2570	2,155.2	2907	121.88	164.4	0.7415	354.3
1	RS-56-OSA	268.6	2161	385.2	3099	34.38	276.6	0.1243	106.5

Atlas IIAS

Stage	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Stage	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
0	RS-56-OBA	1,906.0	2570	2,155.2	2907	120.32	162.3	0.7415	349.7
1	RS-56-OSA	268.6	2161	385.2	3099	35.94	289.1	0.1243	111.4

XLR-115 (RL-10)	RL-10A-1 (Centaur A)	RL-10A-3 (Centaur B)	RL-10A-3-1 (Centaur C)	RL-10A-3-3
RL-10A-3-3A	RL-10A-4	RL-10A-4N	RL-10A-4-1	RL-10A-4-1N

Centaur

Versions	Engines	Thrust s.l.	Isp s.l.	Thrust vac	Isp vac	Propellant	Burn time	Flow rate	Total Imp
Versions	Engines	kN	N*s/kg	kN	N*s/kg	tons	s	t/s	MN*s
D, D-1A	RL-10A-3-3			133.4	4336	13.79	448.2	0.0308	59.8
D-1AR, D-1B	RL-10A-3-3A			146.8	4358	13.79	409.5	0.0337	60.1
D-2	RL-10A-3-3A			146.8	4358	16.93	502.7	0.0337	73.8
D-2A	RL-10A-4			182.4	4378	16.93	406.4	0.0417	74.1
D-2A	RL-10A-4N			185.0	4402	16.93	402.7	0.0420	74.5
D-2A1	RL-10A-4-1			195.7	4378	16.93	378.7	0.0447	74.1
D-2A1	RL-10A-4-1N			198.4	4418	16.93	377.0	0.0449	74.8