RS-68 engine
E309957
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| RS-68 | 3 |
| RS-68A | 2 |
| RS-68 engine canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2849463 — 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: RS-68 engine Context triple: [Aerojet Rocketdyne, notableProduct, RS-68 engine]
-
A.
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.
-
B.
Rocketdyne H-1
The Rocketdyne H-1 was a kerosene/liquid-oxygen rocket engine developed in the United States and used on early Saturn launch vehicles during the Apollo era.
-
C.
CE-20 cryogenic engine
The CE-20 cryogenic engine is an Indian-developed, liquid hydrogen–liquid oxygen rocket engine that powers the upper stage of ISRO’s heaviest launch vehicles for placing large payloads into orbit.
-
D.
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.
-
E.
Curtiss-Wright XLR25 rocket engine
The Curtiss-Wright XLR25 was an American liquid-fueled rocket engine developed in the 1950s to power high-speed experimental research aircraft such as the Bell X-2.
- 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: RS-68 engine Target entity description: 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.
-
A.
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.
-
B.
Rocketdyne H-1
The Rocketdyne H-1 was a kerosene/liquid-oxygen rocket engine developed in the United States and used on early Saturn launch vehicles during the Apollo era.
-
C.
CE-20 cryogenic engine
The CE-20 cryogenic engine is an Indian-developed, liquid hydrogen–liquid oxygen rocket engine that powers the upper stage of ISRO’s heaviest launch vehicles for placing large payloads into orbit.
-
D.
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.
-
E.
Curtiss-Wright XLR25 rocket engine
The Curtiss-Wright XLR25 was an American liquid-fueled rocket engine developed in the 1950s to power high-speed experimental research aircraft such as the Bell X-2.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
liquid-fueled rocket engine
ⓘ
liquid-fueled rocket engine ⓘ rocket engine ⓘ |
| application | first stage propulsion ⓘ |
| chamberPressure | about 97 bar ⓘ |
| comparison | lower performance but cheaper than Space Shuttle Main Engine ⓘ |
| coolingMethod | ablative nozzle cooling ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| cycleType | gas-generator cycle ⓘ |
| derivative |
RS-68 engine
self-linksurface differs
ⓘ
surface form:
RS-68A
|
| designFeature | fewer parts than Space Shuttle Main Engine ⓘ |
| designGoal |
heavy-lift capability
ⓘ
reduced cost ⓘ simplified design ⓘ |
| developedBy |
Pratt & Whitney Rocketdyne
ⓘ
surface form:
Rocketdyne
|
| developedFor |
Delta IV
ⓘ
surface form:
Delta IV launch vehicle
|
| firstFlight | 2002 ⓘ |
| generation | first-generation large LOX/LH2 booster engine ⓘ |
| gimbalRange | about 8 degrees ⓘ |
| ignitionSystem | pyrotechnic ignition ⓘ |
| improvedVersionOf |
RS-68 engine
self-linksurface differs
ⓘ
surface form:
RS-68
|
| manufacturer |
Aerojet Rocketdyne
ⓘ
Pratt & Whitney Rocketdyne ⓘ
surface form:
Rocketdyne
|
| mounting | single engine on Delta IV Common Booster Core ⓘ |
| numberOfEnginesOnDeltaIVHeavy | three ⓘ |
| oxidizer | liquid oxygen ⓘ |
| primaryUser |
National Reconnaissance Office
ⓘ
United States Air Force ⓘ |
| propellantFeed | turbopump-fed ⓘ |
| propellantType |
liquid hydrogen
ⓘ
liquid oxygen ⓘ |
| reusability | expendable ⓘ |
| specificImpulseSeaLevel | about 365 s ⓘ |
| specificImpulseVacuum |
about 410 s
ⓘ
about 414 s ⓘ |
| status | operational ⓘ |
| throttleCapability | throttleable ⓘ |
| thrustSeaLevel | about 2,950 kN ⓘ |
| thrustVacuum |
about 3,137 kN
ⓘ
about 3,374 kN ⓘ |
| usedBy | United Launch Alliance ⓘ |
| usedFor |
geostationary transfer orbit launches
ⓘ
government payloads ⓘ heavy-lift missions ⓘ national security payloads ⓘ |
| usedOn |
Delta IV
ⓘ
Delta IV Heavy ⓘ Delta IV ⓘ
surface form:
Delta IV Medium
|
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: RS-68 engine Description of subject: 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.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
RS-68A
this entity surface form:
RS-68
subject surface form:
RS-68
this entity surface form:
RS-68A
subject surface form:
RS-68A
this entity surface form:
RS-68
subject surface form:
Ares V
this entity surface form:
RS-68