Encyclopedia Astronautica
Castor 4XL


Solid propellant rocket stage. Loaded/empty mass 15,400/2,500 kg. Thrust 745.00 kN. Vacuum specific impulse 283 seconds. Provides supplemental thrust for H-2 or H-2A.

Propellant Formulation: HTPB.

Status: Active.
Gross mass: 15,400 kg (33,900 lb).
Unfuelled mass: 2,500 kg (5,500 lb).
Height: 14.90 m (48.80 ft).
Diameter: 1.02 m (3.34 ft).
Thrust: 745.00 kN (167,482 lbf).
Specific impulse: 283 s.
Burn time: 60 s.
Number: 54 .

More... - Chronology...


Associated Countries
Associated Engines
  • Castor 4AXL Thiokol solid rocket engine. 599.8 kN. In production. Isp=269s. Strap-on booster version, first tested May 1992. Its 30% performance increase would improve performance of Atlas and other vehicles. First flight 2001. More...

Associated Launch Vehicles
  • H-IIA 2024 Japanese orbital launch vehicle. Three stage vehicle consisting of 4 x Castor 4XL + 2 x H-II SRB-A boosters + two-stage core vehicle. More...

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...

Home - Browse - Contact
© / Conditions for Use