X-254 Manufacturer Name: X-254. Other Designations: Antares 1A. Designer: Thiokol. Gross Mass: 1,225 kg (2,700 lb). Empty Mass: 294 kg (648 lb). Propellants: Solid. Thrust(vac): 60.500 kN (13,601 lbf). Thrust(sl): 55.100 kN (12,387 lbf). Isp: 256 sec. Isp (sea level): 233 sec. Burn time: 39 sec. Diameter: 0.78 m (2.55 ft). Length: 3.38 m (11.08 ft). Chambers: 1. Country: USA. First Flight: 1960. Last Flight: 1978. Flown: 45. X-254 used on Rocket Stages Used on stage: Antares 1A. on launch vehicle: Blue Scout 1. Used on stage: Antares 1A. on launch vehicle: Blue Scout 2. Used on stage: Antares 1A. on launch vehicle: Blue Scout Junior. Used on stage: Antares 1A. on launch vehicle: Scout X-1.                   Contact us with any corrections, additions, or comments. Conditions for use of drawings, pictures, or other materials from this site.. To contact astronauts or cosmonauts. © Mark Wade, 1997 - 2007 except where otherwise noted.

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