Lioré et Olivier 300
type of aircraft
The Lioré et Olivier 300 (abbreviated to LeO 300) was a 1930s French prototype night bomber. Only one was built when the programme was abandoned.
Design and development
The LeO 300 was designed to meet a French requirement for a BN.5 category night bomber. It was a high-wing cantilever monoplane with a crew of five. The prototype first flew in September 1933, powered by four 500 hp (373 kW) Renault 12Jb engines mounted in tandem pairs on the wings. The LeO 300 was superseded by the LeO 301 with more powerful engines but with the withdrawal of the requirement it was abandoned in final assembly and work on the programme was stopped.
Variants
LeO 300
Prototype four-engine night bomber, one built.
Leo 301
Improved variant with more powerful engines, not completed.
Specifications
Data from General characteristics
Crew: 5
Length: 23.98 m (78 ft 8 in)
Wingspan: 38 m (124 ft 8 in)
Height: 6 m (19 ft 8 in)
Wing area: 185 m2 (1,990 sq ft)
Empty weight: 7,600 kg (16,755 lb)
Gross weight: 14,800 kg (32,628 lb)
Powerplant: 4 × Renault 12Jb V-12 water-cooled piston engines, 370 kW (500 hp) each
Performance
Maximum speed: 210 km/h (130 mph, 110 kn)
Service ceiling: 5,000 m (16,000 ft)
Notes
Bibliography
Hartmann, Gérard. Les Avions Lioré et Olivier.
The public source identifies “Lioré et Olivier 300” as type of aircraft. This brief keeps that definition visible, then builds a research path around Lioré, Olivier and type.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Lioré et Olivier 300”, the useful work is to connect “type of aircraft” to the records capable of establishing context and consequence.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Nov 8, 2025. The linked authority identifier is Q16821048. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1933.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Lioré et Olivier 300”, its source revision and the description used here.
- Expand the search: follow Lioré et Olivier 300 primary sources, Lioré et Olivier 300 archive and Lioré research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Lioré et Olivier 300”?
- What terminology or title could unlock a more precise catalogue search?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Lioré et Olivier 300” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.