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Castor 120
Thiokol solid rocket engine. Motor similar in size to the Peacekeeper missile stage 1 motor; filled the gap between Castor 4A and the large segmented motors. First flight 1989. Solid propellant rocket stage. Modification of Peacekeeper ICBM first stage.

AKA: SR118. Status: Out of production. Number: 18 . Thrust: 1,650.00 kN (370,930 lbf). Gross mass: 53,118 kg (117,105 lb). Unfuelled mass: 4,086 kg (9,008 lb). Specific impulse: 280 s. Specific impulse sea level: 229 s. Burn time: 81 s. Height: 9.02 m (29.59 ft). Diameter: 2.36 m (7.74 ft).

A motor similar in size to the Peacekeeper missile stage 1 motor. It fills the gap between Castor 4A and the large segmented motors. Unit cost would be about $3.5 million for volume production, rising to $7.5 million for one annually. Further applications include using it as a strap-on for launchers, such as Delta. It can be used in a stage 1 or 2 strap-on since the forward and aft ends can take tension and compression forces. A (5.5 degree thrust vector control is provided by a movable nozzle. The grain can be changed (tailored) by adding aft slots to reduce thrust during maximum-q, and by adding forward slots for high initial thrust.. First Flight. November 1994. Propellant Type: TP-H1246 HTPB, 19% Al, and 69% AP. Propellant Shape: three machined aft conical slots with formed forward slot. Propellant Mass Fraction: 0.923 (49,032 kg). Burn Time: 81 sec.. Thrust: 1650 kN vacuum average. Isp: 280.1 sec vacuum. Total Impulse: 133,440 kNs vacuum. Pressure: 101 atm maximum and 78 atm average. Nozzle Throat Diameter: 368 mm. Nozzle Length: 1448 mm. Nozzle Exit Diameter: 1600 mm. Nozzle Materials: glass epoxy and polyisoprene flex bearing. 3D carbon-carbon throat. carbon phenolic exit cone. aluminum stationary shell. steel throat support. Casing Materials: carbon epoxy, lined with silica-filled EPDM rubber EPM.

Thrust (sl): 1,313.900 kN (295,376 lbf). Thrust (sl): 133,987 kgf. Chamber Pressure: 79.00 bar. Area Ratio: 24. Propellant Formulation: HTPB.



Subtopics

TU-904 Thiokol solid rocket engine. Peacekeeper first stage.

Peacekeeper 1 Thiokol solid rocket engine. In Production. MX Stage 1. Used as first stage of Taurus launch vehicle for initial test. Solid propellant rocket stage. ICBM MX Peacekeeper ICBM 1st stage. Used for only first Taurus launch.

Country: USA. Launch Vehicles: Taurus, Athena-1, Athena-2, Taurus 2210, Taurus 2110, Athena-3, Taurus 3210, Satellite Launch Vehicle, Taurus 3110. Propellants: Solid. Stages: Castor 120. Agency: Thiokol.

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