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Star 27

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Star 27
Star-27
Star-27
Credit: Thiokol
Thiokol solid rocket engine. Apogee motor used on CTS, GMS, BS, GPS, GOES satellites. In Production.
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AKA: 34.35-KS-6,010; OIS; TE-M-616. Status: In Production. Thrust: 27.00 kN (6,069 lbf). Gross mass: 361 kg (795 lb). Unfuelled mass: 27 kg (59 lb). Specific impulse: 288 s. Burn time: 34 s. Height: 1.30 m (4.27 ft). Diameter: 0.69 m (2.28 ft).

Apogee motor was developed for the Canadian Communications Research Centre's Communications Technology Satellite, and an offloaded version was qualified and flown successfully. With various propellant loadings and explosive transfer assemblies, it was used for the Broadcast Satellite Experiment, the Geostationary Meteorological Satellite, the Navigation Technology Satellite No. 2, the Global Positioning System Satellites, the P78-1 Satellite, and the Geostationary Operational Environmental Satellite. Charge: 338 kg of AP/HTPB/Al propellant in a 6Al-4V titanium case with a graphite/carbon phenolic nozzle. Propellant mass fraction 0.924. (propellant mass can be reduced up to 25%). Total impulse 96,986 kgf-s.

Propellant Formulation: HTPB.

Subtopics
Star 27A Thiokol solid rocket engine. In Production. Total flown included in total for Star-27E. Total impulse 89,684 kgf-sec. Motor propellant mass fraction 0.919.
Star 27B Thiokol solid rocket engine. In Production. Total flown included in total for Star-27E. Total impulse 92,296 kgf-sec. Motor propellant mass fraction 0.921.
Star 27C Thiokol solid rocket engine. In Production. Total flown included in total for Star-27E. Total impulse 88,555 kgf-sec. Motor propellant mass fraction 0.918.
Star 27D Thiokol solid rocket engine. In Production. Total flown included in total for Star-27E. Total impulse 88,668 kgf-sec. Motor propellant mass fraction 0.921.
Star 27E Thiokol solid rocket engine. In Production. Total impulse 88,301 kgf-sec. Motor propellant mass fraction 0.921.
Country: USA. Spacecraft: GOES, CTS, Himawari, GPS Block 1, GPS Block 2 and 2A. Launch Vehicles: Atlas F/OIS, Atlas E/OIS, Strypi XI. Propellants: Solid. Stages: Star 27. Agency: Thiokol, Fairchild. More at: 9713.
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