F-1A
Rocketdyne F-1A proposed uprated F-1 liquid rocket engine for Saturn V-class first-stage studies. NASA design and test-study data list 1,800,000 lbf sea-level thrust, 269.7 s sea-level specific impulse, 303.1 s vacuum specific impulse, 2,020,700 lbf vacuum thrust, and a 19,000 lb engine mass; two F-1A engines were ground tested, with no flight installation asserted here.
Identity
- Aliases
- F-1AF1ARocketdyne F-1A
- Domains
- spaceflight
- Identity Level
- variant
- Kind
- liquid-rocket-engine
- Name
- F-1A
- Status
- historical
Details
- Description
- Rocketdyne F-1A proposed uprated F-1 liquid rocket engine for Saturn V-class first-stage studies. NASA design and test-study data list 1,800,000 lbf sea-level thrust, 269.7 s sea-level specific impulse, 303.1 s vacuum specific impulse, 2,020,700 lbf vacuum thrust, and a 19,000 lb engine mass; two F-1A engines were ground tested, with no flight installation asserted here.
- Developers
- Dry Mass Kg
- 8,618
- Family
- Length M
- 5.596
- Lineage
- Note
- NASA describes F-1A as the proposed uprated F-1 upgrade and records two F-1A engines ground tested; this supports a direct-derivative edge without implying a flight installation.
- Related Propulsion System
- Relationship
- direct-derivative-of
- Sources
- Accessed Date
- 2026-08-07
- Note
- NASA explicitly distinguishes the flight-proven F-1 and proposed F-1A upgrade.
- Publisher
- NASA Technical Reports Server
- Title
- From Earth to Orbit: An Assessment of Transportation Options
- Accessed Date
- 2026-08-07
- Note
- NASA's F-1/F-1A engine data package documents the distinct development boundary.
- Publisher
- NASA Technical Reports Server
- Title
- Advanced Transportation
- Manufacturers
- Propellants
- RP-1liquid oxygen
- Rocket Specs
- Cycle
- gas-generator
- Sea Level Specific Impulse S
- 269.7
- Sea Level Thrust Kn
- 8,007
- Vacuum Specific Impulse S
- 303.1
- Vacuum Thrust Kn
- 8,988
Links
Assets & Meta
- Creation Time
- August 8, 2026 at 00:41:31 UTC
- Updated Time
- August 21, 2026 at 11:25:53 UTC
Other
- Diameter M
- 3.645
- Sources
- Accessed Date
- 2026-08-07
- Note
- NASA distinguishes the flight-proven F-1 from the proposed F-1A upgrade and records that two F-1A engines had been ground tested.
- Publisher
- NASA Technical Reports Server
- Title
- From Earth to Orbit: An Assessment of Transportation Options
- Accessed Date
- 2026-08-07
- Note
- NASA F-1/F-1A engine data package documents the distinct development boundary.
- Publisher
- NASA Technical Reports Server
- Title
- Advanced Transportation
- Accessed Date
- 2026-08-20
- Note
- NASA F-1/F-1A comparison lists 1,800,000 lbf sea-level thrust, 269.7 s sea-level specific impulse, and 19,000 lb weight for F-1A.
- Publisher
- NASA Technical Reports Server
- Title
- What is the F-1 Engine?
- Accessed Date
- 2026-08-20
- Note
- NASA technical table lists F-1A vacuum thrust 2,020,700 lbf, vacuum specific impulse 303.1 s, 18.36 ft length, 11.96 ft diameter, 19,000 lb mass, and O2/RP-1 propellant.
- Publisher
- NASA Technical Reports Server
- Title
- Advanced Transportation System Studies: Engine Specifications