Hirth HM 504
E834074
The Hirth HM 504 is a German four-cylinder, air-cooled inverted inline aircraft engine widely used in light training and sport aircraft of the 1930s and 1940s.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Hirth HM 504 canonical | 2 |
| Hirth | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9979082 — 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: Hirth HM 504 Context triple: [Bücker Bü 131, powerplant, Hirth HM 504]
-
A.
Heinkel He 70
The Heinkel He 70 was a German single-engine, fast mailplane and passenger aircraft of the early 1930s that later served as a reconnaissance and light bomber for the Luftwaffe.
-
B.
Heinkel He 60
The Heinkel He 60 was a German biplane reconnaissance seaplane used primarily by the Kriegsmarine in the 1930s.
-
C.
Heinkel Tourist 103 A1
The Heinkel Tourist 103 A1 is a later, improved version of Heinkel’s classic Tourist motor scooter, featuring updated engineering and styling for mid-20th-century touring use.
-
D.
Fieseler Fi 156 Storch
The Fieseler Fi 156 Storch was a German World War II liaison and reconnaissance aircraft renowned for its exceptional short takeoff and landing (STOL) capabilities.
-
E.
Grob G 850 Strato 2C
The Grob G 850 Strato 2C is a high-altitude, long-endurance experimental research aircraft developed by German manufacturer Grob Aircraft for atmospheric and surveillance missions.
- 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: Hirth HM 504 Target entity description: The Hirth HM 504 is a German four-cylinder, air-cooled inverted inline aircraft engine widely used in light training and sport aircraft of the 1930s and 1940s.
-
A.
Heinkel He 70
The Heinkel He 70 was a German single-engine, fast mailplane and passenger aircraft of the early 1930s that later served as a reconnaissance and light bomber for the Luftwaffe.
-
B.
Heinkel He 60
The Heinkel He 60 was a German biplane reconnaissance seaplane used primarily by the Kriegsmarine in the 1930s.
-
C.
Heinkel Tourist 103 A1
The Heinkel Tourist 103 A1 is a later, improved version of Heinkel’s classic Tourist motor scooter, featuring updated engineering and styling for mid-20th-century touring use.
-
D.
Fieseler Fi 156 Storch
The Fieseler Fi 156 Storch was a German World War II liaison and reconnaissance aircraft renowned for its exceptional short takeoff and landing (STOL) capabilities.
-
E.
Grob G 850 Strato 2C
The Grob G 850 Strato 2C is a high-altitude, long-endurance experimental research aircraft developed by German manufacturer Grob Aircraft for atmospheric and surveillance missions.
- F. None of above. chosen
Statements (39)
| Predicate | Object |
|---|---|
| instanceOf |
aircraft engine
ⓘ
piston engine ⓘ |
| applicationDomain |
general aviation
ⓘ
military training aviation ⓘ |
| category |
1930s aircraft piston engines
ⓘ
Hirth aircraft engines ⓘ air-cooled aircraft piston engines ⓘ inline aircraft piston engines ⓘ |
| configuration | inline engine ⓘ |
| coolingMethod | air-cooled ⓘ |
| countryOfOrigin | Germany ⓘ |
| cylinderConfiguration | four-cylinder ⓘ |
| designGoal |
offer good visibility over the nose via inverted configuration
ⓘ
provide reliable power for basic training aircraft ⓘ |
| engineCycle | four-stroke ⓘ |
| era | interwar period ⓘ |
| fuelType | aviation gasoline ⓘ |
| ignitionSystem | magneto ignition ⓘ |
| manufacturer |
Hirth
ⓘ
linked to:
Hirth HM 504
|
| notableFeature |
compact inverted inline layout for improved pilot visibility
ⓘ
widely used in German light aircraft of the 1930s and 1940s ⓘ |
| orientation | inverted ⓘ |
| powerClass | low-power light-aircraft engine ⓘ |
| productionPeriod |
1930s
ⓘ
1940s ⓘ |
| usedBy | Germany ⓘ |
| usedFor |
civil sport flying
ⓘ
pilot training ⓘ |
| usedIn |
light training aircraft
ⓘ
sport aircraft ⓘ |
| usedInConflict | World War II ⓘ |
| usedInPeriod |
1930s
ⓘ
1940s ⓘ |
| usedOn |
Bücker Bü 131 Jungmann
ⓘ
linked to:
Bücker Bü 131
Bücker Bü 133 Jungmeister ⓘ Fieseler Fi 5 ⓘ Göppingen Gö 3 Minimoa (powered variants) ⓘ Klemm Kl 35 ⓘ |
| 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: Hirth HM 504 Description of subject: The Hirth HM 504 is a German four-cylinder, air-cooled inverted inline aircraft engine widely used in light training and sport aircraft of the 1930s and 1940s.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.