Pratt & Whitney R-1535 Twin Wasp Junior radial engine
E926490
The Pratt & Whitney R-1535 Twin Wasp Junior is a 14-cylinder, air-cooled radial aircraft engine developed in the 1930s, widely used in high-performance racing and military aircraft of its era.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Pratt & Whitney R-1535 Twin Wasp Junior | 2 |
| Pratt & Whitney R-1535 Twin Wasp Junior radial engine canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11448007 — 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: Pratt & Whitney R-1535 Twin Wasp Junior radial engine Context triple: [Hughes H-1 Racer, powerplant, Pratt & Whitney R-1535 Twin Wasp Junior radial engine]
-
A.
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.
-
B.
Pratt & Whitney Wasp radial engine
The Pratt & Whitney Wasp radial engine is a pioneering air-cooled aircraft engine introduced in the 1920s, renowned for its reliability and widespread use in early commercial and military airplanes.
-
C.
Wright R-1820 radial engine
The Wright R-1820 radial engine is a widely used American air-cooled, nine-cylinder aircraft engine that powered numerous military and civilian aircraft from the 1930s through World War II and beyond.
-
D.
Wright R-3350 Duplex-Cyclone radial engine
The Wright R-3350 Duplex-Cyclone is a powerful American 18-cylinder air-cooled radial aircraft engine widely used in World War II and early postwar bombers and airliners.
-
E.
Wright J-5C Whirlwind radial engine
The Wright J-5C Whirlwind radial engine was a reliable air-cooled aircraft engine of the 1920s, best known for powering Charles Lindbergh’s Spirit of St. Louis on the first solo nonstop transatlantic flight.
- 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: Pratt & Whitney R-1535 Twin Wasp Junior radial engine Target entity description: The Pratt & Whitney R-1535 Twin Wasp Junior is a 14-cylinder, air-cooled radial aircraft engine developed in the 1930s, widely used in high-performance racing and military aircraft of its era.
-
A.
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.
-
B.
Pratt & Whitney Wasp radial engine
The Pratt & Whitney Wasp radial engine is a pioneering air-cooled aircraft engine introduced in the 1920s, renowned for its reliability and widespread use in early commercial and military airplanes.
-
C.
Wright R-1820 radial engine
The Wright R-1820 radial engine is a widely used American air-cooled, nine-cylinder aircraft engine that powered numerous military and civilian aircraft from the 1930s through World War II and beyond.
-
D.
Wright R-3350 Duplex-Cyclone radial engine
The Wright R-3350 Duplex-Cyclone is a powerful American 18-cylinder air-cooled radial aircraft engine widely used in World War II and early postwar bombers and airliners.
-
E.
Wright J-5C Whirlwind radial engine
The Wright J-5C Whirlwind radial engine was a reliable air-cooled aircraft engine of the 1920s, best known for powering Charles Lindbergh’s Spirit of St. Louis on the first solo nonstop transatlantic flight.
- F. None of above. chosen
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
aircraft piston engine
ⓘ
air‑cooled engine ⓘ radial engine ⓘ |
| applicationRole |
high‑performance racing
ⓘ
military service ⓘ |
| boreStrokeConfiguration | two‑row 14‑cylinder radial layout ⓘ |
| configuration | radial ⓘ |
| coolingSystem | air‑cooled ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| cycle | four‑stroke ⓘ |
| cylinderArrangement | two‑row radial ⓘ |
| cylinderCount | 14 ⓘ |
| designation | R‑1535 ⓘ |
| designedFor | medium‑power aircraft applications ⓘ |
| displacement |
1535 cubic inches
ⓘ
approximately 25.2 liters ⓘ |
| era | 1930s ⓘ |
| family |
Pratt & Whitney Twin Wasp Junior family
ⓘ
linked to:
Pratt & Whitney R-2180 Twin Wasp E
Pratt & Whitney Wasp series ⓘ |
| firstRun | early 1930s ⓘ |
| fuelType | aviation gasoline ⓘ |
| ignitionSystem | dual ignition ⓘ |
| manufacturer | Pratt & Whitney ⓘ |
| materialUse |
aluminum alloy components
ⓘ
steel components ⓘ |
| nickname | Twin Wasp Junior ⓘ |
| notableCharacteristic |
compact two‑row radial design
ⓘ
reliable operation in military service ⓘ widely used in 1930s racing aircraft ⓘ |
| primaryUsePeriod |
1930s
ⓘ
early 1940s ⓘ |
| propellerDrive | direct drive ⓘ |
| successorInFamily | Pratt & Whitney R‑1830 Twin Wasp ⓘ |
| supercharging | single‑stage supercharger ⓘ |
| typicalCompressionRatio | around 6:1 to 6.7:1 ⓘ |
| typicalMounting | nose‑mounted on aircraft ⓘ |
| typicalPowerOutput | approximately 700 horsepower ⓘ |
| usedBy |
United States military
ⓘ
linked to:
United States Armed Forces
foreign military operators ⓘ |
| usedIn |
military aircraft
ⓘ
racing aircraft ⓘ transport aircraft ⓘ |
| usedInConflict | World War II ⓘ |
| valveTrain | overhead valve ⓘ |
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: Pratt & Whitney R-1535 Twin Wasp Junior radial engine Description of subject: The Pratt & Whitney R-1535 Twin Wasp Junior is a 14-cylinder, air-cooled radial aircraft engine developed in the 1930s, widely used in high-performance racing and military aircraft of its era.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Pratt & Whitney R-1535 Twin Wasp Junior radial engine
linked to: Pratt & Whitney R-1535 Twin Wasp Junior radial engine