Encyclopedia Astronautica
Star 12



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Star-12
Credit: Thiokol
Thiokol solid rocket engine. 5.560 kN. In Production. Isp=252s. SARV Retro, MK IV and V was a 60-pound motor using 40 pounds of propellant. It was designed for use as a retrograde rocket for an unmanned satellite vehicle.

The outstanding feature of this motor is its extremely short length. For all future deliveries, changes will be made to this design. Due to the unavailability of outdated materials, the main grain propellant will be changed from TP-G-3085 to TP-H-3340. Because of the higher flame temperature of the TP-H-3340 propellant, the molybdenum throat insert will be changed to G-90 graphite material. Total impulse 4,693 kgf-s. Propellant mass fraction 0.66.

AKA: 7.5-KS-1,250; TE-M-236; SARV Retro, MK IV.
Status: In Production.
Gross mass: 28 kg (61 lb).
Unfuelled mass: 10 kg (22 lb).
Diameter: 0.30 m (1.00 ft).
Thrust: 5.56 kN (1,250 lbf).
Specific impulse: 252 s.
Burn time: 7.50 s.
Number: 510 .

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Associated Countries
See also
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...

Bibliography
  • Thiokol Corporation Web Site, As of May, 1999. Web Address when accessed: here.

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