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Mitsubishi Ki-67-I Hiryu ("Flying Dragon") “Peggy”
|6 to 8|
|73’10” by 61’4”
22.5m by 18.7m by 7.7m
65.85 square meters
|334 mph 19,980 feet
538 km/h at 6090 meters
|25 feet per second
7.6 meters per second
|2 1900 hp (1417 kW) Mitsubishi Ha-104
18-cylinder two-row radial engines driving four-blade constant-speed
|1 20mm Ho-5
electric dorsal turret.
4 12.7mm Type 1 machine guns in nose, tail, and two beam positions.
|1102 lbs (500 kg) normal
1764 lbs (800 kg) or one torpedo maximum
6393 lbs (2900 kg) as kamikaze
|1740 miles (2800 km) normal
2360 miles (3800 km) maximum
|A total of 698 aircraft from 1944-4:
The first 160 production aircraft were not
equipped with torpedo racks.
The Japanese Army continually requested
additional equipment until 2 December 1943, when the design was frozen
as the Ki-67-I with the specifications shown above.
Beginning with the 451st aircraft, a second
12.7mm Type 1 machine gun was added in the tail.
The Ki-67-II would have used 2400 hp (1789
engines but neither the engines nor this aircraft variant went into
Numerous other experimental models never
went into production.
The Ki-67 Hiryu (Flying Dragon) or Army Type 4 Heavy Bomber was intended to have the speed and maneuverability of a fighter. It was also armored and had self-sealing fuel tanks. In many respects it resembled the American B-26 Marauder. It was the best all-around bomber produced by Japan. However, material shortages and constant change requests delayed its production until 1944, when it was too late to make much difference in the outcome of the war.
The specification dated to late 1940 and called
for a tactical heavy bomber to replace the Ki-49
Helen. Its expected theater of use at the time was in Manchuria against the Soviet Union. Mitsubishi began design
work in February 1941 under Ozawa. The wings and tails were based on
the G4M1 "Betty", but in most
other respects the design was a radical departure from previous
Japanese military aircraft. The design emphasized ease of production
and included adequate armor protection and self-sealing fuel and oil
tanks. The latter features unfortunately delayed production
significantly. The first prototype flew on 27 December 1942 and
performed well, lacking only very slightly in speed, and had the
maneuverability to perform loops. Production models increased the fuel
capacity and armament.
The Ki-67 first saw operational use in the air
battle off Formosa in October
1944. A number were staged through Iwo
Jima to attack American airfields
in the Marianas, and the
type saw heavy use at Okinawa.
Production was badly impaired thereafter by the American strategic bombing campaign
and the earthquake of December 1944, which badly affected engine
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