Mitsubishi Ki-109 Hiryu “Peggy” manuals
A compact historical reference collection on the Mitsubishi Ki-109 heavy interceptor, the wartime development of the Ki-67 airframe for high-altitude bomber interception. This digital collection contains two unique manuals in Japanese and English, supported by an archival technical synthesis covering the aircraft’s structure, propulsion, handling and production history.
Collection contents
- Ki-109, Training Device Test Plan with Mounted Gun, 「キ一〇九」搭載砲用内謄砲試験計画, Japanese
- Ki-109 Photographic Collection, English
Technical reference
The supplied synthesis presents the Ki-109 with a 73 ft 9¾ in wingspan, 58 ft 10¾ in length, 708.8 sq ft wing area, an approximate empty weight of 16,367 lb and loaded weight of 23,810 lb. It gives a reference maximum speed of 342 mph at 19,980 ft, cruising speed of 249 mph at 26,245 ft, service ceiling of 31,070 ft and operational range of approximately 1,367 miles.
The report examines the blunt, faired nose replacing the Ki-67 greenhouse, the removal or fairing-over of selected waist gun blisters and dorsal turrets, and reinforcement of the forward fuselage bulkheads and longerons for the 75 mm Type 88 cannon. It reports a peak recoil impulse of approximately four tons and describes the resulting structural and aerodynamic compromises.
The Ki-109 is described with twin Mitsubishi Ha-104 Army Type 4 18-cylinder radial engines. Supplied power figures are 1,900 hp takeoff, 1,810 hp military power at 7,220 ft, and 1,610 hp high-altitude power at 20,015 ft. The synthesis discusses the mechanical two-speed supercharger’s limitations above 23,000 ft and reports that the proposed Ha-104 Ru turbo-supercharged development was discontinued after exhaust-manifold cracking and cooling problems.
Handling notes cover the forward centre-of-gravity shift from the 75 mm cannon and 15-round ammunition magazine, the need for nose-up elevator trim, and the reported longitudinal deceleration and downward pitching moment when firing. The supplied production notes identify the canceled Ki-109a/Ki-109b weapon concept, the turret-deletion directive in Bulletins Ki-109-01 and Ki-109-04, retention of a 12.7 mm Type 1 tail gun for self-defense, and a reported total of 22 operational production aircraft.
Historical reference notice
This collection is intended for aviation history, research, restoration and archival study. It is not current approved airworthiness data, operating approval, weapons guidance or maintenance authorization. The technical figures and interpretations are reproduced as supplied archival reference material and have not been independently verified here. Users must verify provenance, rights and applicability before relying on any document or report.