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Aerojet LR87-AJ-11 rocket engine

Aerojet's historical LR87-AJ-11 was the twin-subassembly, gas-generator storable-propellant engine assembly used on Titan III and Titan IV first stages. NASA documents two identical thrust-chamber subassemblies operating simultaneously on nitrogen tetroxide and Aerozine-50, with a vacuum-rated assembly thrust of 520,000 lbf (approximately 2,313 kN); this record does not infer a current lifecycle or vehicle relationship beyond the documented Titan application.

Aerojet LR87-AJ-11 rocket engine
U.S. Air Force · Public domain in the United States as a U.S. Air Force work made by an Air Force employee in official duties; attribution to the U.S. Air Force is preserved. Source rights: https://commons.wikimedia.org/wiki/File:2014_08_140829-F-IO108-012.jpg#Licensing · Source

Identity

Aliases
LR87-AJ-11LR87-AJ-11 engineLR87-AJ-11 Titan engine
Domains
spaceflight
Identity Level
model
Kind
liquid-rocket-engine
Name
Aerojet LR87-AJ-11 rocket engine
Status
historical

Details

Description
Aerojet's historical LR87-AJ-11 was the twin-subassembly, gas-generator storable-propellant engine assembly used on Titan III and Titan IV first stages. NASA documents two identical thrust-chamber subassemblies operating simultaneously on nitrogen tetroxide and Aerozine-50, with a vacuum-rated assembly thrust of 520,000 lbf (approximately 2,313 kN); this record does not infer a current lifecycle or vehicle relationship beyond the documented Titan application.
Propellants
nitrogen tetroxideAerozine-50
Rocket Specs
Chamber Count
2
Cycle
gas generator
Vacuum Thrust
…

Links

Official Url
https://ntrs.nasa.gov/api/citations/19750013258/downloads/19750013258.pdf

Assets & Meta

Creation Time
August 15, 2026 at 05:31:38 UTC
Updated Time
August 22, 2026 at 10:37:52 UTC
Image
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Other

Sources
  • Accessed Date
    2026-08-14
    Note
    NASA's Titan launch-vehicle propulsion memorandum identifies the exact LR87-AJ-11 assembly as two identical engines attached to one frame, operating simultaneously for 520,000 lbf vacuum-rated thrust, with gas generators and N2O4/Aerozine-50 propellants.
    Publisher
    NASA Technical Reports Server
    Title
    Titan III Launch Vehicle Propulsion System
    Url
    https://ntrs.nasa.gov/api/citations/19750013258/downloads/19750013258.pdf
  • Accessed Date
    2026-08-14
    Note
    NASA's Titan III propulsion analysis documents the LR87-AJ-11 N2O4/Aerozine-50 feed system, gas-generator turbopumps, and Titan first-stage application.
    Publisher
    NASA Technical Reports Server
    Title
    Titan III Propulsion Systems
    Url
    https://ntrs.nasa.gov/api/citations/19950006191/downloads/19950006191.pdf
Aerojet LR87-AJ-11 rocket engine - AeroVia