Kestrel
E18342
Kestrel is a pressure-fed, liquid-fueled rocket engine developed by SpaceX for the second stage of its early Falcon 1 launch vehicle.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Kestrel canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T146553 — 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: Kestrel Context triple: [Falcon 1, secondStageEngine, Kestrel]
-
A.
Canary
Canary is an experimental, bleeding-edge release channel of Google Chrome that provides the newest features and updates ahead of other versions, often at the cost of stability.
-
B.
Baldwin the Eagle
Baldwin the Eagle is the costumed eagle mascot who represents Boston College at its athletic events and school functions.
-
C.
Aquila
Aquila is a genus of large, powerful birds of prey that includes several species of true eagles found across much of the world.
-
D.
The Eagle
The Eagle is a 1925 silent adventure film starring Rudolph Valentino as a dashing Russian outlaw hero.
-
E.
Barkley
Barkley is a surname most notably associated with Alben W. Barkley, the 35th vice president of the United States under President Harry S. Truman.
- 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: Kestrel Target entity description: Kestrel is a pressure-fed, liquid-fueled rocket engine developed by SpaceX for the second stage of its early Falcon 1 launch vehicle.
-
A.
Canary
Canary is an experimental, bleeding-edge release channel of Google Chrome that provides the newest features and updates ahead of other versions, often at the cost of stability.
-
B.
Baldwin the Eagle
Baldwin the Eagle is the costumed eagle mascot who represents Boston College at its athletic events and school functions.
-
C.
Aquila
Aquila is a genus of large, powerful birds of prey that includes several species of true eagles found across much of the world.
-
D.
The Eagle
The Eagle is a 1925 silent adventure film starring Rudolph Valentino as a dashing Russian outlaw hero.
-
E.
Barkley
Barkley is a surname most notably associated with Alben W. Barkley, the 35th vice president of the United States under President Harry S. Truman.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
liquid-fueled rocket engine
ⓘ
pressure-fed rocket engine ⓘ rocket engine ⓘ |
| application | orbital upper stage propulsion ⓘ |
| attitudeControlMethod | thrust vector control via helium cold gas thrusters ⓘ |
| chamberPressure_bar | about 9 ⓘ |
| coolingMethod | ablative cooling ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| cycle | pressure-fed cycle ⓘ |
| designedForEnvironment | vacuum ⓘ |
| developer | SpaceX ⓘ |
| feedSystem | pressure-fed ⓘ |
| firstFlightDate | 2006-03-24 ⓘ |
| firstFlightVehicle |
Falcon 1 Flight 1
ⓘ
linked to:
Falcon 1 rocket
|
| fuel | RP-1 ⓘ |
| gimbalCapability | non-gimbaled ⓘ |
| lastFlightDate | 2009-07-14 ⓘ |
| lastFlightVehicle |
Falcon 1 Flight 5
ⓘ
linked to:
Falcon 1 rocket
|
| launchVehicleFamily | Falcon family ⓘ |
| manufacturer | SpaceX ⓘ |
| nozzleExpansionRatio | about 60 ⓘ |
| nozzleMaterial | niobium alloy ⓘ |
| oxidizer | liquid oxygen ⓘ |
| propellantCombination | LOX/RP-1 ⓘ |
| propellantFeedGas | helium ⓘ |
| propellantType | liquid ⓘ |
| relatedEngine |
Merlin 1A
ⓘ
Merlin 1C ⓘ |
| restartCapability | designed for in-space restart ⓘ |
| specificImpulseVac_s | about 317 ⓘ |
| stageApplication | second stage ⓘ |
| status | retired ⓘ |
| successfullyReachedOrbitOnVehicle |
Falcon 1 Flight 4
ⓘ
linked to:
Falcon 1 rocket
Falcon 1 Flight 5 ⓘ
linked to:
Falcon 1 rocket
|
| throttleCapability | fixed thrust ⓘ |
| thrustEnvironment | vacuum-optimized ⓘ |
| thrustInVacuum_kN | about 31 ⓘ |
| thrustInVacuum_lbf | about 7000 ⓘ |
| usedByOrganization | SpaceX ⓘ |
| usedInProgram |
Falcon 1 program
ⓘ
linked to:
Falcon 1 rocket
|
| usedOnLaunchVehicle |
Falcon 1 Flight 1
ⓘ
linked to:
Falcon 1 rocket
Falcon 1 Flight 2 ⓘ
linked to:
Falcon 1 rocket
Falcon 1 Flight 3 ⓘ
linked to:
Falcon 1 rocket
Falcon 1 Flight 4 ⓘ
linked to:
Falcon 1 rocket
Falcon 1 Flight 5 ⓘ
linked to:
Falcon 1 rocket
|
| usedOnVehicle |
Falcon 1
ⓘ
linked to:
Falcon 1 rocket
|
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: Kestrel Description of subject: Kestrel is a pressure-fed, liquid-fueled rocket engine developed by SpaceX for the second stage of its early Falcon 1 launch vehicle.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
Falcon 1 rocket