X-258 Manufacturer Name: X-258. Other Designations: Altair 2. Designer: Thiokol. Gross Mass: 275 kg (606 lb). Empty Mass: 37 kg (81 lb). Propellants: Solid. Thrust(vac): 22.200 kN (4,991 lbf). Thrust(sl): 20.200 kN (4,541 lbf). Isp: 266 sec. Isp (sea level): 242 sec. Burn time: 28 sec. Diameter: 0.64 m (2.09 ft). Length: 2.53 m (8.30 ft). Chambers: 1. Country: USA. First Flight: 1963. Last Flight: 1973. Flown: 29. X-258 used on Rocket Stages Used on stage: Altair 2. on launch vehicle: Delta D. Used on stage: Altair 2. on launch vehicle: Scout A. Used on stage: Altair 2. on launch vehicle: Scout X-4.                   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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