Aerojet YLR-87-AJ-7
Historical Aerojet-General YLR-87-AJ-7 storable bipropellant first-stage engine assembly for the Titan II Gemini Launch Vehicle. NASA's chronology records Aerojet-General delivery of the first flight engines for GLV No. 1, and NASA dates Gemini I's first production Titan II launch to 1964-04-08; this record uses that date as the assembly's first flight. The assembly used two independently operating thrust-chamber/turbopump subassemblies on one frame; NASA's Gemini-Titan table lists two engines at 215,000 lbf (about 956.3 kN) sea-level thrust each, using UDMH and nitrogen tetroxide.
Identity
- Aliases
- YLR87-AJ-7
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- Aerojet YLR-87-AJ-7
- Status
- historical
Details
- Description
- Historical Aerojet-General YLR-87-AJ-7 storable bipropellant first-stage engine assembly for the Titan II Gemini Launch Vehicle. NASA's chronology records Aerojet-General delivery of the first flight engines for GLV No. 1, and NASA dates Gemini I's first production Titan II launch to 1964-04-08; this record uses that date as the assembly's first flight. The assembly used two independently operating thrust-chamber/turbopump subassemblies on one frame; NASA's Gemini-Titan table lists two engines at 215,000 lbf (about 956.3 kN) sea-level thrust each, using UDMH and nitrogen tetroxide.
- First Flight Date
- 1964-04-08
- Propellants
- UDMHnitrogen tetroxide
- Rocket Specs
- Sea Level Thrust Kn
- 956.3
Links
- Official Url
- https://sma.nasa.gov/LaunchVehicle/titanglv.html
Assets & Meta
- Creation Time
- July 29, 2026 at 08:11:02 UTC
- Updated Time
- August 22, 2026 at 06:24:51 UTC
Other
- Sources
- Accessed Date
- 2026-08-14
- Note
- NASA's Titan II Gemini vehicle table identifies two Aerojet-General YLR-87-AJ-7 first-stage engines, UDMH/N2O4 propellants, and 1,912,640 newtons total thrust; the per-engine figure is about 956.3 kN.
- Publisher
- NASA
- Title
- NASA Historical Data Book, Volume II
- Accessed Date
- 2026-08-14
- Note
- NASA's technical report describes the YLR87-AJ-7 as a turbopump-fed storable bipropellant Titan II Gemini engine assembly with two independently operating subassemblies mounted on one frame.
- Publisher
- NASA Technical Reports Server
- Title
- Aerospace Report on Gemini Launch Vehicle Propulsion
- Accessed Date
- 2026-07-29
- Publisher
- NASA Safety and Mission Assurance
- Title
- Titan II Gemini Launch Vehicle
- Accessed Date
- 2026-08-21
- Note
- NASA chronology records Aerojet-General delivery of the first flight engines for Gemini launch vehicle No. 1, supporting the historical manufacturer context for YLR-87-AJ-7.
- Publisher
- NASA
- Title
- Project Gemini: A Chronology. Part 2 (A)
- Accessed Date
- 2026-08-21
- Note
- NASA identifies Gemini I as the first production Gemini spacecraft and Titan II launch vehicle, with liftoff on 1964-04-08; this supports the assembly first-flight date.
- Publisher
- NASA
- Title
- Gemini I