Mitsubishi Ki-46 “Dinah” Manuals Collection
A compact historical reference collection covering the Mitsubishi Ki-46 Type 100 “Dinah,” the elegant Japanese Army strategic reconnaissance aircraft developed for speed, range, and low aerodynamic drag.
This digital collection brings together three historical documents and visual-reference materials in Japanese, Russian, and English. It is intended for aviation historians, aircraft researchers, collectors, and enthusiasts studying the Ki-46 and its wartime technical record.
Collection contents
- Ki-46 Type 100 Aircraft Technical Drawings — 一〇〇式司令部偵察機附図, Japanese language.
- Ki-46 (Type 100) Ground Testing Report No. 147 — Отчет №147 по результатам наземных испытаний трофейного японского самолета Мицубиси “Р-100”, Russian language.
- Ki-46 Photographic Collection — slides, photographs, and brochure material, English language.
Engine technical notes and propulsion
The Ki-46 developed through several engine configurations as the design was adapted for high-altitude reconnaissance:
- Mitsubishi Ha-102, Ki-46-II: twin 14-cylinder, two-row, air-cooled radial engines, reported at approximately 1,080 hp each.
- Mitsubishi Ha-112-II, Ki-46-III: upgraded direct fuel-injection engines, reported at approximately 1,500 hp each.
- Ejector exhaust: wartime modifications replaced the conventional collector arrangement with individual ejector pipes. Historical notes associate the change with an increase in top speed of roughly 12 km/h.
- Ki-46-IV prototypes: the late-war Ha-112-II Ru installation is described with exhaust-driven turbo-supercharging and water-methanol injection for improved high-altitude performance.
Handling and stability studies
Historical flight-test and engineering notes describe stable high-altitude cruise characteristics alongside operational limitations. At extreme altitudes, aileron response and elevator authority could become less effective. The landing-gear struts were also reported as vulnerable to snapping or buckling during hard landings on rough forward airfields, even after reinforcing changes. Later production aircraft incorporated modest stabilizer-area changes associated with pitch stability.
Reported Ki-46-III performance figures
Post-war testing and intelligence evaluations reported the following approximate figures for the Ki-46-III, with results varying by aircraft condition, fuel, configuration, and test method:
- Maximum speed: approximately 630 km/h at 6,000 m, with some reports of up to 684 km/h using high-octane fuel.
- Cruising speed: approximately 400 km/h.
- Service ceiling: approximately 10,500 m.
- Maximum range: approximately 4,000 km with full internal and wing-tank capacity.
- Climb: approximately 17 minutes 58 seconds to 8,000 m in the cited test data.
Engineering bulletins and combat conversions
As the strategic situation changed, historical engineering notes describe Ki-46-III KAI conversion work intended to provide a limited defensive-interceptor capability. The reported changes included reduced forward fuel capacity, reintroduction of a stepped nose to accommodate two forward-firing 20 mm Ho-5 cannon, and an obliquely mounted 37 mm Ho-203 cannon in the upper fuselage. These conversions were reported to suffer from reduced climb performance, limiting their usefulness against high-altitude bomber formations.
Historical reference notice
The Ki-46 is remembered for its exceptionally clean aerodynamic design, closely cowled radial engines, narrow fuselage, and, in the Ki-46-III, a continuous glazed nose. These materials provide documentary evidence and visual context for research into the aircraft, its testing, and its development.
Important: This is historical and reference material, not current approved airworthiness data, maintenance approval, or operating instruction. Language and document condition vary by item. Please verify provenance, rights, and distribution status before any further use or reproduction.