Nakajima Ha-1b radial engine
E231754
The Nakajima Ha-1b was a Japanese air-cooled radial aircraft engine used in pre–World War II and early-war fighters such as the Nakajima Ki-27.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Nakajima Ha-1b radial engine canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2068569 — 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: Nakajima Ha-1b radial engine Context triple: [Nakajima Ki-27, powerplant, Nakajima Ha-1b radial engine]
-
A.
Nakajima Sakae radial engine
The Nakajima Sakae radial engine was a widely used Japanese air-cooled aircraft engine of World War II, best known for powering frontline Imperial Japanese Navy and Army fighters and bombers such as the Mitsubishi A6M Zero.
-
B.
Mitsubishi Kinsei radial engine
The Mitsubishi Kinsei was a Japanese air-cooled radial aircraft engine widely used in World War II combat aircraft.
-
C.
Bristol Hercules radial engine
The Bristol Hercules radial engine was a British air-cooled, sleeve-valve aircraft engine widely used in World War II bombers and other military aircraft for its reliability and high power output.
-
D.
Bristol Pegasus radial engine
The Bristol Pegasus radial engine was a widely used British air-cooled aircraft engine of the interwar and World War II era, powering numerous bombers and transport aircraft.
-
E.
Pratt & Whitney R-1830 Twin Wasp radial engine
The Pratt & Whitney R-1830 Twin Wasp is a widely used American 14-cylinder air-cooled radial aircraft engine of the World War II era, powering numerous fighters, bombers, and transport aircraft.
- 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: Nakajima Ha-1b radial engine Target entity description: The Nakajima Ha-1b was a Japanese air-cooled radial aircraft engine used in pre–World War II and early-war fighters such as the Nakajima Ki-27.
-
A.
Nakajima Sakae radial engine
The Nakajima Sakae radial engine was a widely used Japanese air-cooled aircraft engine of World War II, best known for powering frontline Imperial Japanese Navy and Army fighters and bombers such as the Mitsubishi A6M Zero.
-
B.
Mitsubishi Kinsei radial engine
The Mitsubishi Kinsei was a Japanese air-cooled radial aircraft engine widely used in World War II combat aircraft.
-
C.
Bristol Hercules radial engine
The Bristol Hercules radial engine was a British air-cooled, sleeve-valve aircraft engine widely used in World War II bombers and other military aircraft for its reliability and high power output.
-
D.
Bristol Pegasus radial engine
The Bristol Pegasus radial engine was a widely used British air-cooled aircraft engine of the interwar and World War II era, powering numerous bombers and transport aircraft.
-
E.
Pratt & Whitney R-1830 Twin Wasp radial engine
The Pratt & Whitney R-1830 Twin Wasp is a widely used American 14-cylinder air-cooled radial aircraft engine of the World War II era, powering numerous fighters, bombers, and transport aircraft.
- F. None of above. chosen
Statements (26)
| Predicate | Object |
|---|---|
| instanceOf |
aircraft engine
ⓘ
piston engine ⓘ radial engine ⓘ |
| application | military aviation ⓘ |
| coolingMethod | air-cooled ⓘ |
| countryOfOrigin | Japan ⓘ |
| cylinderArrangement | single-row radial ⓘ |
| designPeriod | 1930s ⓘ |
| engineConfiguration | radial ⓘ |
| engineCycle | four-stroke ⓘ |
| era |
early World War II
ⓘ
pre–World War II ⓘ |
| fuelType | aviation gasoline ⓘ |
| manufacturer | Nakajima Aircraft Company ⓘ |
| notableAircraftType | Imperial Japanese Army fighter ⓘ |
| numberOfCylinders | 9 ⓘ |
| powerplantFor | pre-war Japanese fighters ⓘ |
| regionOfUse | East Asia ⓘ |
| successorEngineFamily |
Nakajima Ha-5
ⓘ
surface form:
Nakajima Ha-25
Nakajima Ha-5 ⓘ |
| usedBy |
Imperial Japanese Army
ⓘ
Imperial Japanese Army Air Service ⓘ |
| usedInAircraft | Nakajima Ki-27 ⓘ |
| usedInConflict |
Sino-Japanese War (1937–1945)
ⓘ
surface form:
Second Sino-Japanese War
World War II ⓘ |
| usedInRole | fighter aircraft ⓘ |
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: Nakajima Ha-1b radial engine Description of subject: The Nakajima Ha-1b was a Japanese air-cooled radial aircraft engine used in pre–World War II and early-war fighters such as the Nakajima Ki-27.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.