Encyclopedia Astronautica
Castor 4BXL


Thiokol solid rocket engine. 429 kN. In Production. Isp=267s. ORBEX version, combined the 4XL motor with 4B's TVC system (6 degree).

CTA's ORBEX used the Castor 4BXL version, which combined the 4XL motor with 4B's TVC system (6 degree.. First Flown: May 8, 1991. Flown: 2 to end of 1993 (100% success). Propellant Type: Tp-H8229 HTPB Polymer, with 20% Al. Propellant Shape: radially slotted center perforate. Propellant Mass Fraction: 0.868 (9969 kg). Itotal: 26,141 kNs vacuum at 25 Celsius. Pressure: 50.6 atm maximum and an average of 30.7 atm. Nozzle Throat Diameter: 30.84 cm. Nozzle Length: varies - SL, with altitude and canted available. Nozzle Exit Diameter: 90.2 cm. Nozzle Materials: 4130 steel. Casing Materials: 4130 steel.

Chamber Pressure: 31.10 bar. Area Ratio: 8.55. Propellant Formulation: HTPB.

AKA: Castor 4B; TX-859.
Status: In Production.
Gross mass: 11,482 kg (25,313 lb).
Unfuelled mass: 1,513 kg (3,335 lb).
Height: 8.98 m (29.48 ft).
Diameter: 1.02 m (3.34 ft).
Thrust: 429.00 kN (96,443 lbf).
Specific impulse: 267 s.
Burn time: 61 s.

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Associated Countries
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Associated Manufacturers and Agencies
  • Thiokol American manufacturer of rocket engines and rockets. Thiokol Corporation, Ogden, UT, USA. More...

Associated Propellants
  • Solid Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. More...

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