Encyclopedia Astronautica
Castor 4


Solid propellant rocket stage. Loaded/empty mass 10,534/1,269 kg. Thrust 407.21 kN. Vacuum specific impulse 261 seconds.

Cost $ : 2.030 million.

Gross mass: 10,534 kg (23,223 lb).
Unfuelled mass: 1,269 kg (2,797 lb).
Height: 9.07 m (29.75 ft).
Diameter: 1.02 m (3.34 ft).
Span: 1.02 m (3.34 ft).
Thrust: 407.21 kN (91,545 lbf).
Specific impulse: 261 s.
Specific impulse sea level: 228 s.
Burn time: 54 s.
Number: 558 .

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Associated Countries
Associated Engines
  • Castor 4 Thiokol solid rocket engine. 407.2 kN. Series of motors used as Delta strap-on boosters and as first and upper stages for low-cost all-solid-propellant designs. Isp=261s. First flight 1975. More...

Associated Launch Vehicles
  • Athena H American test vehicle. Four stage vehicle consisting of 4 x Recruit + 1 x Castor 4 + 1 x Antares 2 + 1 x Alcor IA More...
  • Delta 3914 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4 + 1 x ELT Thor/RS-27 + 1 x Delta P /TR-201 + 1 x Star 37E More...
  • Delta 3910 American orbital launch vehicle. Three stage vehicle consisting of 9 x Castor 4 + 1 x ELT Thor/RS-27 + 1 x Delta P /TR-201 More...
  • Delta 3910/PAM American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4 + 1 x ELT Thor/RS-27 + 1 x Delta P + 1 x Star 48B More...
  • Delta 3913 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4 + 1 x ELT Thor/RS-27 + 1 x Delta P /TR-201 + 1 x Star 37N More...
  • Delta 3920 American orbital launch vehicle. Three stage vehicle consisting of 9 x Castor 4A + 1 x ELT Thor/RS-27 + 1 x Delta K More...
  • Delta 3920/PAM American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4A + 1 x ELT Thor/RS-27 + 1 x Delta K + 1 x Star 48B More...
  • Delta 3924 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4A + 1 x ELT Thor/RS-27 + 1 x Delta K + 1 x Star 37E More...
  • Delta 3920-8 American orbital launch vehicle. Three stage vehicle consisting of 9 x Castor 4A + 1 x ELT Thor/RS-27 + 1 x Delta K 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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