Encyclopedia Astronautica
JT9D-3A


Pratt and Whitney turbofan engine. 208.8 kN. Out of Production. Thrust is maximum sea level thrust; specific impulse is sea level value at that thrust. Isp=10939s.

Thrust (sl): 189.800 kN (42,669 lbf). Thrust (sl): 19,355 kgf. Engine: 4,013 kg (8,847 lb). Thrust to Weight Ratio: 5.3.

Status: Out of Production.
Unfuelled mass: 4,013 kg (8,847 lb).
Thrust: 208.80 kN (46,940 lbf).
Specific impulse: 10,939 s.
Burn time: 3,825 s.

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Associated Propellants
  • Air/Kerosene Ambient air (78 % nitrogen, 21% oxygen, etc.) is scooped up by air intakes and used in turbojet, turbofan, ramjet, scramjet, or other airbreathing engines. It is used to burn aviation-grade kerosene, commercial grade JP-4 or JP-5, their military equivalents, or special high-temperature blends such as those used in the SR-71. More...

Associated Stages
  • NASA 747 Turbofan-powered rocket stage carrier aircraft. Loaded/empty mass 276,364/177,000 kg. Thrust 835.23 kN. Specific impulse 10939 seconds. Boeing swept wing airliner, modified to carry shuttle on its back. Also considered as launch aircraft for Manned Sortie Vehicle and air-launched Minuteman and Peacekeeper. Release conditions: Piggy-back, 109,000 kg payload, 37.2 m length x 24.0 m span at 538 kph at 5183 m. More...

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