LR-105-NA-5
Rocketdyne LR-105-NA-5 is the Atlas MA-3 sustainer-engine variant used on Atlas F. NASA's Atlas E/F data identifies the MA-3 system as two LR-89-NA-5 booster engines, one LR-105-NA-5 sustainer, and two LR-101-NA-7 verniers; the sustainer averages 267,000 N and burns 309 s in that system. This record isolates the LR-105-NA-5 sustainer while preserving its RP-1/liquid-oxygen identity.
Identity
- Aliases
- LR105-NA-5Atlas MA-3 sustainer engine
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- LR-105-NA-5
- Status
- historical
Details
- Description
- Rocketdyne LR-105-NA-5 is the Atlas MA-3 sustainer-engine variant used on Atlas F. NASA's Atlas E/F data identifies the MA-3 system as two LR-89-NA-5 booster engines, one LR-105-NA-5 sustainer, and two LR-101-NA-7 verniers; the sustainer averages 267,000 N and burns 309 s in that system. This record isolates the LR-105-NA-5 sustainer while preserving its RP-1/liquid-oxygen identity.
- Developers
- Family
- Manufacturers
- Propellants
- RP-1liquid oxygen
- Rocket Specs
- Chamber Count
- 1
- Sea Level Thrust Kn
- 267
Assets & Meta
- Creation Time
- August 1, 2026 at 17:58:07 UTC
- Updated Time
- August 22, 2026 at 06:39:14 UTC
Other
- Sources
- Accessed Date
- 2026-08-01
- Note
- The Atlas F table identifies the MA-3 propulsion system's LR105-NA-5 sustainer engine.
- Publisher
- NASA Technical Reports Server
- Title
- NASA Historical Data Book: Atlas launch vehicle characteristics
- Accessed Date
- 2026-08-01
- Note
- The historical Atlas tables distinguish the LR-105 sustainer family and the MA-3 Atlas F installation.
- Publisher
- NASA Technical Reports Server
- Title
- NASA Historical Data Book: Atlas characteristics
- Accessed Date
- 2026-08-21
- Note
- NASA identifies the Atlas MA-3 system as two LR-89-NA-5 booster engines, one LR-105-NA-5 sustainer, and two LR-101-NA-7 verniers, with the sustainer averaging 267,000 N and a 309-second system sustainer burn; this supports the exact LR-105-NA-5 sustainer context.
- Publisher
- NASA Technical Reports Server
- Title
- NASA Historical Data Book: Atlas E/F Characteristics