RD-181
E592136
RD-181 is a Russian-built liquid-fueled rocket engine used to power the first stage of certain orbital launch vehicles, notably Northrop Grumman’s Antares.
All labels observed (1)
| Label | Occurrences |
|---|---|
| RD-181 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T6431749 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: RD-181 Context triple: [Antares launch vehicle, firstStageEngineType, RD-181]
-
A.
RD-180
The RD-180 is a Russian-built, two-chamber liquid-fueled rocket engine that has powered several American launch vehicles, notably variants of the Atlas V.
-
B.
RD-107
RD-107 is a Soviet-designed liquid-fueled rocket engine, best known for powering the first stages of early R-7 family launch vehicles used in historic missions like Sputnik and Vostok.
-
C.
RS-68 engine
The RS-68 engine is a powerful liquid-fueled rocket engine used primarily on the Delta IV launch vehicle, known for its high thrust and simplified design for cost-effective heavy-lift missions.
-
D.
NK-33 engine
The NK-33 engine is a Soviet-era high-performance liquid-fuel rocket engine originally developed for the N1 lunar rocket program, known for its efficiency and thrust-to-weight ratio.
-
E.
Raptor engine
The Raptor engine is SpaceX’s next-generation full-flow staged combustion methane-fueled rocket engine designed to power the Starship launch system.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: RD-181 Target entity description: RD-181 is a Russian-built liquid-fueled rocket engine used to power the first stage of certain orbital launch vehicles, notably Northrop Grumman’s Antares.
-
A.
RD-180
The RD-180 is a Russian-built, two-chamber liquid-fueled rocket engine that has powered several American launch vehicles, notably variants of the Atlas V.
-
B.
RD-107
RD-107 is a Soviet-designed liquid-fueled rocket engine, best known for powering the first stages of early R-7 family launch vehicles used in historic missions like Sputnik and Vostok.
-
C.
RS-68 engine
The RS-68 engine is a powerful liquid-fueled rocket engine used primarily on the Delta IV launch vehicle, known for its high thrust and simplified design for cost-effective heavy-lift missions.
-
D.
NK-33 engine
The NK-33 engine is a Soviet-era high-performance liquid-fuel rocket engine originally developed for the N1 lunar rocket program, known for its efficiency and thrust-to-weight ratio.
-
E.
Raptor engine
The Raptor engine is SpaceX’s next-generation full-flow staged combustion methane-fueled rocket engine designed to power the Starship launch system.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
liquid-fueled rocket engine
ⓘ
rocket engine ⓘ |
| application | expendable launch vehicles ⓘ |
| chamberPressure | approximately 260 bar ⓘ |
| combustionChambers | 1 ⓘ |
| control | thrust vector control via gimbaling ⓘ |
| coolingMethod | regenerative cooling ⓘ |
| countryOfOrigin | Russia ⓘ |
| customer |
Northrop Grumman
ⓘ
Orbital ATK ⓘ |
| derivedFrom | RD-191 ⓘ |
| designedFor | medium-lift launch vehicles ⓘ |
| developer | NPO Energomash ⓘ |
| engineCycle | oxidizer-rich staged combustion ⓘ |
| exportedTo |
United States
ⓘ
linked to:
United States of America
|
| fuel | RP-1 kerosene ⓘ |
| gimbalRange | up to about 5 degrees ⓘ |
| ignitionType | pyrotechnic ignition system ⓘ |
| manufacturer | NPO Energomash ⓘ |
| marketedFor | commercial launch services ⓘ |
| nozzleQuantity | 1 ⓘ |
| oxidizer | liquid oxygen ⓘ |
| propellantCombination | LOX/RP-1 ⓘ |
| propellantFeedSystem | turbopump-fed ⓘ |
| propellantType |
RP-1 kerosene
ⓘ
liquid oxygen (LOX) ⓘ |
| purpose | to provide high-performance first-stage propulsion for Antares ⓘ |
| relatedEngine |
RD-180
ⓘ
RD-191 ⓘ |
| replaces | AJ26 engines on Antares ⓘ |
| reusability | designed for expendable use ⓘ |
| role | main engine ⓘ |
| specificImpulseSeaLevel | approximately 311 seconds ⓘ |
| specificImpulseVacuum | approximately 339 seconds ⓘ |
| stage | first stage ⓘ |
| status | operational ⓘ |
| throttleCapability | throttleable ⓘ |
| thrustSeaLevel | approximately 1.86 MN ⓘ |
| thrustVacuum | approximately 1.92 MN ⓘ |
| usedBy | United States launch vehicles ⓘ |
| usedFor | orbital launch vehicles first stage propulsion ⓘ |
| usedFrom | mid-2010s ⓘ |
| usedIn |
Antares 200-series first stage
ⓘ
linked to:
Antares launch vehicle
Antares 230 launch vehicle ⓘ
linked to:
Antares launch vehicle
Antares 230+ launch vehicle ⓘ
linked to:
Antares launch vehicle
|
| usedOn | Antares launch vehicle ⓘ |
| usedOnMission | Cygnus cargo resupply missions to the ISS ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: RD-181 Description of subject: RD-181 is a Russian-built liquid-fueled rocket engine used to power the first stage of certain orbital launch vehicles, notably Northrop Grumman’s Antares.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.