D-21 reconnaissance drone
E626658
The D-21 reconnaissance drone was a high-speed, high-altitude, unmanned spy aircraft developed in the 1960s for covert photographic missions over hostile territory, notably designed to cruise at Mach 3+ and extreme altitudes.
All labels observed (1)
| Label | Occurrences |
|---|---|
| D-21 reconnaissance drone canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T6864994 — 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: D-21 reconnaissance drone Context triple: [Lockheed Skunk Works, notableProduct, D-21 reconnaissance drone]
-
A.
Lockheed U-2
The Lockheed U-2 is a high-altitude American reconnaissance aircraft designed for intelligence gathering missions, particularly during the Cold War.
-
B.
Lockheed A-12
The Lockheed A-12 was a high-altitude, Mach 3+ reconnaissance aircraft developed in the early 1960s for the CIA as part of the Oxcart program, serving as the secret predecessor to the SR-71 Blackbird.
-
C.
Douglas X-3 Stiletto
The Douglas X-3 Stiletto was a slender, jet-powered experimental research aircraft of the early 1950s designed to investigate sustained supersonic flight and advanced aerodynamic concepts for future high-speed aircraft.
-
D.
IAI Dagger
The IAI Dagger is an Israeli-built, export variant of the Mirage 5 fighter-bomber that served as a key combat aircraft for Argentina, notably during the Falklands War.
-
E.
Martin Marietta X-24B
The Martin Marietta X-24B was an experimental lifting-body research aircraft developed in the 1970s to study unpowered reentry and landing techniques that helped pave the way for the Space Shuttle program.
- 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: D-21 reconnaissance drone Target entity description: The D-21 reconnaissance drone was a high-speed, high-altitude, unmanned spy aircraft developed in the 1960s for covert photographic missions over hostile territory, notably designed to cruise at Mach 3+ and extreme altitudes.
-
A.
Lockheed U-2
The Lockheed U-2 is a high-altitude American reconnaissance aircraft designed for intelligence gathering missions, particularly during the Cold War.
-
B.
Lockheed A-12
The Lockheed A-12 was a high-altitude, Mach 3+ reconnaissance aircraft developed in the early 1960s for the CIA as part of the Oxcart program, serving as the secret predecessor to the SR-71 Blackbird.
-
C.
Douglas X-3 Stiletto
The Douglas X-3 Stiletto was a slender, jet-powered experimental research aircraft of the early 1950s designed to investigate sustained supersonic flight and advanced aerodynamic concepts for future high-speed aircraft.
-
D.
IAI Dagger
The IAI Dagger is an Israeli-built, export variant of the Mirage 5 fighter-bomber that served as a key combat aircraft for Argentina, notably during the Falklands War.
-
E.
Martin Marietta X-24B
The Martin Marietta X-24B was an experimental lifting-body research aircraft developed in the 1970s to study unpowered reentry and landing techniques that helped pave the way for the Space Shuttle program.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
jet-powered aircraft
ⓘ
military aircraft ⓘ reconnaissance drone ⓘ unmanned aerial vehicle ⓘ |
| altitudeClass | high-altitude ⓘ |
| category |
high-altitude drone
ⓘ
high-speed drone ⓘ strategic reconnaissance platform ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| dataCollectionMethod | film photography ⓘ |
| designedBy |
Lockheed engineer Kelly Johnson (program leadership)
ⓘ
linked to:
Clarence "Kelly" Johnson
|
| designedFor |
covert overflight of hostile territory
ⓘ
high-altitude reconnaissance missions ⓘ high-speed reconnaissance missions ⓘ long-range reconnaissance ⓘ operations over politically sensitive regions ⓘ single-use or expendable missions ⓘ |
| designedForAltitude | extreme altitude operations ⓘ |
| designedForSurvivability | penetration of heavily defended airspace ⓘ |
| designedTo | return exposed film for recovery ⓘ |
| designedToAvoid |
enemy air defenses
ⓘ
interception ⓘ radar-guided defenses ⓘ |
| designedToCruiseAt | Mach 3+ ⓘ |
| designedToOperateOver | hostile territory ⓘ |
| developedBy |
Lockheed
ⓘ
linked to:
Lockheed Aircraft Company
Lockheed Skunk Works ⓘ |
| developmentPeriod | 1960s ⓘ |
| era | Cold War ⓘ |
| hasCrew | false ⓘ |
| hasPilotOnboard | false ⓘ |
| intendedUse | overflight of denied Soviet and Chinese airspace ⓘ |
| isManned | false ⓘ |
| isSpyAircraft | true ⓘ |
| isUnmanned | true ⓘ |
| missionProfile | autonomous high-speed overflight ⓘ |
| missionType | covert reconnaissance ⓘ |
| operationalEnvironment | stratosphere ⓘ |
| primaryRole |
photographic intelligence collection
ⓘ
strategic reconnaissance ⓘ |
| propulsionType | ramjet ⓘ |
| riskProfile | reduce risk to human pilots ⓘ |
| sensorType | photographic camera system ⓘ |
| speedClass |
Mach 3-class
ⓘ
high-supersonic ⓘ |
| technologyLevel | advanced for 1960s ⓘ |
| usedFor |
intelligence gathering over denied airspace
ⓘ
strategic photographic missions ⓘ |
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: D-21 reconnaissance drone Description of subject: The D-21 reconnaissance drone was a high-speed, high-altitude, unmanned spy aircraft developed in the 1960s for covert photographic missions over hostile territory, notably designed to cruise at Mach 3+ and extreme altitudes.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.