Encyclopedia Astronautica
Castor 4A


Solid propellant rocket stage. Loaded/empty mass 11,743/1,529 kg. Thrust 478.31 kN. Vacuum specific impulse 266 seconds.

Cost $ : 2.030 million.

Status: Active.
Gross mass: 11,743 kg (25,888 lb).
Unfuelled mass: 1,529 kg (3,370 lb).
Height: 9.12 m (29.92 ft).
Diameter: 1.02 m (3.34 ft).
Span: 1.02 m (3.34 ft).
Thrust: 478.31 kN (107,528 lbf).
Specific impulse: 266 s.
Specific impulse sea level: 237 s.
Burn time: 56 s.
Number: 326 .

More... - Chronology...


Associated Countries
Associated Engines
  • Castor 4A Thiokol solid rocket engine. 478.3 kN. Out of production. Isp=266s. Castor 4A improved Delta performance by 11% by replacing the old fuel with HTPB propellant. Used in Delta 6900; Atlas IIAS; Castor 4A. First flight 1982. More...

Associated Launch Vehicles
  • Delta 4000 American orbital launch vehicle. The Delta 4000 series used more powerful Castor 4A strap-ons, but the old Extended Long Tank core with MB-3 engine. Only two of these were launched. More...
  • Delta 5000 American orbital launch vehicle. The Delta 5000 series used the more powerful Castor 4A strap-ons but with the Extended Long Tank core with RS-27 engine. Only one was launched. More...
  • Delta 6925 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4A + 1 x EELT Thor/RS-27+ 1 x Delta K + 1 x Star 48B More...
  • Delta 4925-8 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4A + 1 x ELT Thor /MB-3 + 1 x Delta K + 1 x Star 48B with 2.4 m (8 foot) diameter fairing) More...
  • Delta 5920-8 American orbital launch vehicle. Three stage vehicle consisting of 9 x Castor 4A + 1 x ELT Thor/RS-27 + 1 x Delta K with 2.4 m (8 foot) diameter fairing) More...
  • Delta 6920-8 American orbital launch vehicle. Three stage vehicle consisting of 9 x Castor 4A + 1 x EELT Thor/RS-27+ 1 x Delta K with 2.4 m (8 foot) diameter fairing) More...
  • Delta 6925-8 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4A + 1 x EELT Thor/RS-27+ 1 x Delta K + 1 x Star 48B with 2.4 m (8 foot) diameter fairing) More...
  • Delta 6920-X Three stage vehicle consisting of 9 x Castor 4A + 1 x EELT Thor/RS-27+ 1 x Delta K with 3.05 m (10 foot) diameter fairing More...
  • Atlas IIAS American orbital launch vehicle. The Atlas II booster was 2.7-meters longer than the Atlas I and included uprated Rocketdyne MA-5A engines. The Atlas I vernier engines were replaced with a hydrazine roll control system. The Centaur stage was stretched 0.9-meters compared to the Centaur I stage. Fixed foam insulation replaced Atlas I's jettisonable insulation panels. Higher performance RL10A-4 or RL10A-4-1 engines replaced Atlas II's RL10A-3-3A. The Atlas IIAS model added four Thiokol Castor IVA solid rocket boosters (SRBs) to the core Atlas stage to augment thrust for the first two minutes of flight. More...
  • Athena-3 American all-solid orbital launch vehicle. Planned but never flown heavier-lift version of Athena. More...
  • EER Aries American low cost orbital launch vehicle. Aries launched to promote a commercial launch vehicle of entirely different configuration. 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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