AJ10 family
AJ10 is Aerojet-General’s family of pressure-fed, storable-propellant rocket engines spanning early upper stages, Apollo service propulsion, Shuttle OMS derivatives, and Orion. Propellant combinations vary by model: NASA documents Aerozine 50 with nitrogen tetroxide for AJ10-137 and AJ10-118K, while Orion’s OMS-E uses monomethyl hydrazine with mixed oxides of nitrogen. Variant-specific propellants and performance should be read with the named model rather than treated as one universal family rating.
Identity
- Aliases
- Aerojet-General AJ10Aerojet AJ10
- Domains
- spaceflight
- Identity Level
- family
- Kind
- liquid-rocket-engine
- Name
- AJ10 family
- Status
- active
Details
- Description
- AJ10 is Aerojet-General’s family of pressure-fed, storable-propellant rocket engines spanning early upper stages, Apollo service propulsion, Shuttle OMS derivatives, and Orion. Propellant combinations vary by model: NASA documents Aerozine 50 with nitrogen tetroxide for AJ10-137 and AJ10-118K, while Orion’s OMS-E uses monomethyl hydrazine with mixed oxides of nitrogen. Variant-specific propellants and performance should be read with the named model rather than treated as one universal family rating.
Links
Assets & Meta
- Creation Time
- July 29, 2026 at 08:12:16 UTC
- Updated Time
- October 17, 2026 at 00:53:17 UTC
- Image
- Download
Other
- Sources
- Accessed Date
- 2026-08-21
- Note
- NASA technical documentation supports the AJ10 family installation boundary in early Vanguard-era upper-stage propulsion without asserting a more precise model for the family record.
- Publisher
- NASA Technical Reports Server
- Title
- Vanguard Launch Vehicle reference
- Accessed Date
- 2026-10-17
- Note
- Printed p.58 identifies the Able-1 second-stage propulsion system as Aerojet Model AJ10-101, not AJ10-118E. This source supports the early AJ10 application boundary.
- Publisher
- NASA Technical Reports Server
- Title
- 1958 NASA/USAF Space Probes (Able-1): Summary, Volume 1
- Accessed Date
- 2026-08-21
- Note
- NASA identifies Aerojet-General as the designer, builder, and tester of the Apollo Service Propulsion System AJ10-137 and records its Aerozine 50 and nitrogen tetroxide hypergolic propellant pair and 20,500 lbf thrust; the rating remains on the AJ10-137 model boundary.
- Publisher
- NASA
- Title
- 60 Years Ago: First Test Firing of the Apollo Service Propulsion System
- Accessed Date
- 2026-08-21
- Note
- NASA documents the AJ10-137 Apollo Service Module engine configuration, including pressure-fed operation, Aerozine 50 and nitrogen tetroxide propellants, and 314.5 s specific impulse; variant-specific performance is not generalized to the family record.
- Publisher
- NASA Technical Reports Server
- Title
- Aerojet - AJ10-137 Apollo Service Module Engine
- Accessed Date
- 2026-08-21
- Note
- NASA identifies the Orion European Service Module propulsion as an AJ10-derived service-propulsion installation and records the later family context without collapsing the Orion engine into the AJ10 family identity.
- Publisher
- NASA
- Title
- Fired Up: Engines and Motors Put Artemis Mission in Motion
- Accessed Date
- 2026-08-21
- Note
- NASA identifies the Delta II second-stage engine as a restartable Aerojet Rocketdyne AJ10-118K using Aerozine 50 and nitrogen tetroxide, supporting the later family application and common propellant pair.
- Publisher
- NASA Science
- Title
- A Reliable Rocket with a Successful Past