page_title: Castor (rocket stage)
section_title: Castor 30
hierarchical_section_title: Castor (rocket stage) / Versions / Flown versions / Castor 30
caption_attribution_description: English: At Vandenberg Air Force Base in California, a worker secures a crane on the Taurus XL Stage 0 motor. The motor will be lifted onto a flatbed truck and transported to Orbital Sciences' Hangar 1555. The Taurus XL will launch NASA's Orbiting Carbon Observatory, or OCO, spacecraft targeted for Jan. 15. The OCO is a new Earth-orbiting mission sponsored by NASA's Earth System Science Pathfinder Program.
context_page_description: The Castor family of solid-fuel rocket stages and boosters built by Thiokol and used on a variety of launch vehicles. They were initially developed as the second-stage motor of the Scout rocket. The design was based on the MGM-29 Sergeant, a surface-to-surface missile developed for the United States Army at the Jet Propulsion Laboratory.
context_section_description: The CASTOR 30 motor is based on the CASTOR 120 motor, which has flown on the Taurus I, Athena I and Athena II launch vehicles. The inaugural flight of the new motor occurred in April 2013 as the second stage on the Orbital Sciences Antares medium-lift rocket for International Space Station resupply missions.
  The CASTOR 30 upper stage measures 138 inches (3.5 m) in length and 92 inches (2.3 m) in diameter, and it weighs 30,000 pounds (14,000 kg). The motor is nominally designed as an upper stage that can function as a second or third stage as well, depending on the vehicle configuration.
  The CASTOR 30XL solid rocket motor measures 236 inches (6.0 m) in length and 92 inches (2.3 m) in diameter, and it weighs approximately 56,000 pounds (25,000 kg). The nozzle is eight feet long with a submerged design with a high performance expansion ratio (56:1) and a dual density exit cone.
caption: A Castor 120 that will be used as Stage 0 of a Taurus XL rocket
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