Manufacturer Name: TE-M-442-1. Government Designation: Burner 2A. Other Designations: 17.8-KS-7,784. Designer: Thiokol. Gross Mass: 261 kg. Empty Mass: 23 kg. Propellants: SolidThrust(vac): 3,531 kgf. Isp: 272 sec. Burn time: 18 sec. Diameter: 0.7 m. Chambers: 1. Country: USA. Status: In Production. References: 410 . Comments: Upper stage motor was flown on the Burner IIA spacecraft for Boeing and the U.S. Air Force. Total flown included in total for Star-26C. Total impulse 64,731 kgf-sec. Motor propellant mass fraction 0.91.