X-15A X-15 Credit - © Mark Wade Gross Mass: 14,184 kg (31,270 lb). Empty Mass: 5,158 kg (11,371 lb). Thrust (vac): 262.445 kN (59,000 lbf). Isp: 276 sec. Burn time: 90 sec. Propellants: Lox/Ammonia. Isp(sl): 239 sec. Diameter: 1.42 m (4.65 ft). Span: 6.80 m (22.30 ft). Length: 15.32 m (50.26 ft). Country: USA. No Engines: 1. Engine: XLR-99. Status: Out of production. Cost $ : 100.000 million. First Flight: 1959. Last Flight: 1968. No Launched: 293. Used on Launch Vehicles: X-15A.                   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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