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Ki-67 “Peggy”, Japanese Heavy Bomber


Photograph of Ki-67 "Peggy"
Wikipedia Commons. Fair use may apply.


Mitsubishi Ki-67-I Hiryu ("Flying Dragon") “Peggy”


Specifications:


Crew

6 to 8

Dimensions

73’10” by 61’4” by 18’5”
22.5m by 18.7m by 7.7m
Wing area 709 square feet
65.85 square meters

Weights

19,068-30,346 lbs
8,649-13,765 kg

Maximum speed      

334 mph 19,980 feet
538 km/h at 6090 meters

Climb rate

25 feet per second
7.6 meters per second

Service ceiling

31,070 feet
9470 meters

Power plant

2 1900 hp (1417 kW) Mitsubishi Ha-104 18-cylinder two-row radial engines driving four-blade constant-speed propellers.

Armament

1 20mm Ho-5 cannon in electric dorsal turret.
4 12.7mm Type 1 machine guns in nose, tail, and two beam positions.

Bomb load

1102 lbs (500 kg) normal
1764 lbs (800 kg) or one torpedo maximum
6393 lbs (2900 kg) as kamikaze

Range

1740 miles (2800 km) normal
2360 miles (3800 km) maximum
Fuel
855 gallons
3886 liters

Production

A total of 698 aircraft from 1944-4:
Mitsubishi (Nagoya, Kumamoto, and Chita):

606 Ki-67s
Kawasaki (Gifu):

91 Ki-67s
Variants

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 kW) Ha-214 engines but neither the engines nor this aircraft variant went into production.

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 production.

References

Francillon (1979)


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