Wright R-1820 radial engine

E275551

aircraft engine piston engine 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.

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All labels observed (4)

Label	Occurrences
Wright R-1820 Cyclone	10
Wright R-1820 radial engine canonical	4
Wright R-1820 Cyclone radial engine	2
Wright R‑1820 Cyclone	1

How this entity was disambiguated

This entity first appeared as the object of triple T2530719 — 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: Wright R-1820 radial engine
Context triple: [North American T-28 Trojan, engineType, Wright R-1820 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. 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.
C. Pratt & Whitney R-2800 Double Wasp
The Pratt & Whitney R-2800 Double Wasp is a powerful American 18-cylinder air-cooled radial aircraft engine widely used in World War II fighters and bombers.
D. 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.
E. 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.
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: Wright R-1820 radial engine
Target entity description: 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.

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. 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.
C. Pratt & Whitney R-2800 Double Wasp
The Pratt & Whitney R-2800 Double Wasp is a powerful American 18-cylinder air-cooled radial aircraft engine widely used in World War II fighters and bombers.
D. 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.
E. 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.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	aircraft engine ⓘ piston engine ⓘ radial engine ⓘ
alsoKnownAs	Cyclone 9 ⓘ
application	bombers ⓘ fighters ⓘ patrol aircraft ⓘ transports ⓘ
bore	6.125 inches (approximate) ⓘ
configuration	single-row radial ⓘ
coolingSystem	air-cooled ⓘ
countryOfOrigin	United States ⓘ linked to: United States of America
cylinderArrangement	radial ⓘ
displacement	1820 cubic inches ⓘ
era	1930s ⓘ
family	Wright Cyclone family ⓘ
fuelSystem	carbureted ⓘ
fuelType	aviation gasoline ⓘ
ignitionSystem	dual magnetos ⓘ
manufacturer	Wright Aeronautical ⓘ linked to: Wright Aeronautical Corporation
notableFeature	widely used in World War II American aircraft ⓘ
notableUser	United States Army Air Forces ⓘ United States Marine Corps ⓘ United States Navy ⓘ civil airlines ⓘ
numberOfCylinders	9 ⓘ
powerOutputRange	700 horsepower to over 1,200 horsepower (depending on variant) ⓘ
productionPeriod	1930s ⓘ 1940s ⓘ
stroke	5.5 inches (approximate) ⓘ
successor	Wright R-2600 (in some applications) ⓘ linked to: Wright R-2600 Twin Cyclone
supercharging	single-stage supercharger (most variants) ⓘ
usedInConflict	World War II ⓘ
usedInRole	civil aviation ⓘ military aviation ⓘ
usedOnAircraft	Boeing 247 (some variants) ⓘ linked to: Boeing 247 Boeing B-17 Flying Fortress ⓘ Curtiss P-36 Hawk ⓘ Douglas DC-2 ⓘ Douglas DC-3 ⓘ Douglas SBD Dauntless ⓘ Grumman F4F Wildcat (early variants) ⓘ linked to: Grumman F4F Wildcat Lockheed Model 10 Electra (some variants) ⓘ linked to: Lockheed Model 10 Electra Martin 139 ⓘ Martin B-10 ⓘ linked to: Martin B‑10 Northrop A-17 ⓘ Sikorsky S-38 ⓘ linked to: Sikorsky S‑38 Sikorsky S-43 ⓘ
valvetrain	overhead valves ⓘ

How these facts were elicited