Encyclopedia Astronautica
X-15A-2



x15a2.jpg
X-15A-2
Credit: NASA
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X-15C 3-view
Credit: © Mark Wade
American air-launched rocketplane. Manned hypersonic research rocket aircraft. Stretched rebuild of crashed X-15A, with drop tanks. Reached Mach 6.7 and 108 km altitude.

Failures: 23.

Stage Data - X-15A-2

  • Stage 0. 1 x NB-52. Gross Mass: 177,273 kg (390,820 lb). Empty Mass: 70,545 kg (155,525 lb). Thrust (vac): 430.472 kN (96,774 lbf). Isp: 5,142 sec. Burn time: 48,000 sec. Isp(sl): 4,675 sec. Diameter: 14.72 m (48.29 ft). Span: 56.40 m (185.00 ft). Length: 47.74 m (156.62 ft). Propellants: Air/Kerosene. No Engines: 8. Engine: J57-19. Status: Out of Production. Comments: Boeing Bomber-swept wing. Maximum release conditions: Wing mounted, 25,000 kg (19.1 m length x 6.7 m span) at 880 kph at 11,448 m altitude.
  • Stage 1. 2 x X-15A-2 Tanks. Gross Mass: 7,026 kg (15,489 lb). Empty Mass: 902 kg (1,988 lb). Thrust (vac): 0.0000 N ( lbf). Isp: 276 sec. Burn time: 55 sec. Isp(sl): 239 sec. Diameter: 0.98 m (3.21 ft). Span: 0.98 m (3.21 ft). Length: 6.86 m (22.50 ft). Propellants: Lox/Ammonia. No Engines: 0. Engine: None. Status: Out of production.
  • Stage 2. 1 x X-15A-2. Gross Mass: 16,069 kg (35,426 lb). Empty Mass: 7,766 kg (17,121 lb). Thrust (vac): 262.445 kN (59,000 lbf). Isp: 276 sec. Burn time: 90 sec. Isp(sl): 239 sec. Diameter: 1.42 m (4.65 ft). Span: 6.80 m (22.30 ft). Length: 15.47 m (50.75 ft). Propellants: Lox/Ammonia. No Engines: 1. Engine: XLR-99. Status: Out of Production.

Gross mass: 23,095 kg (50,915 lb).
Height: 15.47 m (50.75 ft).
Diameter: 1.42 m (4.65 ft).
Thrust: 227.26 kN (51,090 lbf).
Apogee: 75 km (46 mi).
Number: 46 .

More... - Chronology...


Associated Countries
Associated Engines
  • J57-19 Pratt and Whitney turbojet engine. 53.8 kN. Out of production. Thrust is maximum sea level thrust; specific impulse is sea level value at that thrust. Isp=5142s. Used on B-52 launch aircraft for X-15A. First flight 1959. More...
  • None Indicates that the stage shown is a propellant tank. The engine on another stage is drawing propellants from this tank. Performance shown is for that of the engine on the other stage. First flight 1964. More...
  • XLR99 Thiokol Lox/Ammonia rocket engine. 262.4 kN. Out of production. Isp=276s. The first large, man-rated, throttleable, restartable liquid propellant rocket engine, boosted the X-15A. First flight 1959. More...

See also
Associated Manufacturers and Agencies
  • North American American manufacturer of rockets, spacecraft, and rocket engines. North American, Palmdale, El Segundo. Downey, CA, USA More...

Associated Stages
  • NB-52 Subsonic rocket launch aircraft. Loaded/empty mass 177,273/70,545 kg. Thrust 430.47 kN. Specific impulse 5142 seconds. Boeing Bomber-swept wing. Maximum release conditions: Wing mounted, 25,000 kg (19.1 m length x 6.7 m span) at 880 kph at 11,448 m altitude More...
  • X-15A-2 Lox/Ammonia propellant rocket stage. Loaded/empty mass 16,069/7,766 kg. Thrust 262.45 kN. Vacuum specific impulse 276 seconds. More...

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