Encyclopedia Astronautica
J58


Pratt and Whitney turbojet engine. Out of Production. Thrust is maximum sea level thrust; specific impulse is sea level value at that thrust. Isp=2084s.

Status: Out of Production.
Specific impulse: 2,084 s.
Burn time: 5,000 s.

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Associated Countries
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Associated Manufacturers and Agencies
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
  • SR-71/M-12 Jet-powered rocket carrier vehicle. Loaded/empty mass 66,122/27,210 kg. Specific impulse 2084 seconds. Lockheed Reconaissance-delta wing. Maximum release conditions: Piggy-back, 9,091 kg (12.1 m length x 5.2 m span) at 3,300 kph at 24,390 m (D-21). More...

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