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Japan's Imperial Army flag

Japan's Mitsubishi Ki-67 Hiryu (flying dragon) bomber; Army Type 4
Allied code name: Peggy

Photos

  • Mitsubishi Ki-67 Hiryu bomber

Design

In 1940 a specification was put forth for a heavy strategic bomber that would be used against the Soviet Union in an anticipated war with them.1

The Mitsubishi Ki-67 was to be a successor to the Nakajima Ki-49 Donryu as Army specifications were issued in February 1941.2,3,4 Three prototypes were ordered from Mitsubishi.3 The designers (Chief Engineer Ozawa4,5) also tried to make the plane as easy to maintain and manufacture as possible.3,5

Specifications:

  • Altitude: 13,000' - 22,750'3; 13,125' - 22,965' / 4,000 m - 7,000 m5
  • Speed: 340 mph3, 342 mph / 550 kph5
  • Range with 1,102 lb / 500 kg: 435 miles / 700 km5
  • Bombs: Eight 220 lb / 100 kg, three 551 lb / 250 kg, or one 1,102 lb / 500 kg5; 1,764 lb3
  • Crew: 6 - 83, 6 - 105
  • Armament: Three 7.7 mm MGs, and two 12.7 mm MGs5; Five MGs5
  • Engines: Two Mitsubishi Ha-101 (1,450 HP), Nakajima Ha-103 (1,870 HP), Mitsubishi Ha-104 (1,900 HP)5

Unusual for a Japanese design the Mitsubishi Ki-67 had armor protection and self sealing fuel tanks.1,5

After the prototype flew the Army made many suggestions for changes that it delayed the project.1

Construction

The Ki-67 has a metal frame and fabric covering.5

Torpedo Bomber Modification

In December 1942 it was suggested that they be modified as a torpedo bomber.5

Major Sakamoto test flew the prototypes at Yokosuka Naval Air Station.5 One hundred Ki-67s were modified with torpedo racks.5 From the 161st aircraft all Ki-67s had torpedo racks.5

Some Ki-67s were transferred to the Imperial Japanese Navy and they were called Yasukuni.5

Prototype

The Ki-67 prototype first flew on December 27, 19421,3,4,5 / December 27, 19432. The second prototype was ready in February 1943, and the third in March 1943.3

The prototypes could make loops and vertical turns without a bomb load.5

Production

Deliveries of the Ki-67-I began in April 1944 and production was given the highest priority.2,5

Production was disrupted by an earthquake in December 1944 and American bombing.2,5

  • Prototypes: 33,4
    • Production: December 1942 - March 19434
  • Mitsubishi Ki-67: 6981
    • Manufacturers: Mitsubishi (606)2, Kawasaki (91)2, Tachikawa Army Air Arsenal (1)2
  • Mitsubishi Ki-67-I, Army Type 4 Heavy Bomber: 6964
  • Mitsubishi Ki-67-II Prototype: 22,4
  • Total: 6983,5
    • Manufacturer:
      • Mitsubishi Jukogyo K.K.3 at Nagoya, Kumanmoto, Chita (606)5
      • Kawasaki Kokuki Kogyo K.K. at Gifu (91)5
      • Tachikawa Dai-Ichi Rikugun Kokusho at Tachikawa (1)5
      • Nippon Kokusai Koku Kogyo K.K. at Okubo (assembled 29)5
  • Mitsubishi Ki-109: 222,3
    • Built between August 1944 - March 1945.2

Variants

  • Mitsubishi Ki-67-I: First production model.2
  • Mitsubishi Ki-67-I KAI: Suicide bomber.2,4,5 Nose was made solid and packed with explosives.4,5 All turrets removed.5 Crew only three.5
  • Mitsubishi Ki-67-I Glider Tug: Towed Manazuru transport glider.5
  • Mitsubishi Ki-67-Ib:
  • Mitsubishi Ki-67-II Prototype: Has Mitsubishi Ha-214 radial engines (2,400 HP).2,5
  • I-Go-1A: Carried radio controlled I-Go-1A anti-shipping missile.5
  • Yasukuni: Navy version that carried a torpedo.3,5
  • Mitsubishi Ki-69: Escort fighter.5 Never produced.5
  • Mitsubishi Ki-97: Transport.5 Could carry 21 passengers.5 Not produced.5
  • Mitsubishi Ki-109: Heavy fighter.2,3,5 Cannons in nose.2 Crew of two.2 Used Ha-211 Ru engines (2,200 HP).2 Had a 75 mm cannon with 15 rounds installed.3
  • Mitsubishi Ki-112: Multi-seat fighter.5 Not produced.5

Usage

Units

  • Hikosentais (air regiments): 7th4,5, 14th4,5, 16th4,5, 60th5, 61st4,5, 62nd4,5, 74th4,5, 98th4,5, 110th4,5
  • Kokutai: 762nd (Navy)5
  • Hikoshidan (air division): 8th4
  • Hamamatsu Army Bomber Flying School5

Army's First Use

In October 1944 the Ki-67 was used in combat by the 7th Sentai and 98th Sentai.1,5

Navy's First Use

In October 1944 the Ki-67 was first used as a torpedo bomber by the 762nd Kokutai in a battle off of Formosa against the United States 3rd Fleet.1,2,4,5

Okinawa Campaign

During the battle for Okinawa the Ki-67 was used to attack the American Mariana Island air force bases.2,5

China

The Ki-67 was used over China late in the war, but performance was hampered by inexperienced crews.2,5

Specifications

  Mitsubishi Ki-67 Hiryu
Type Bomber1, Heavy Bomber5, Medium Bomber2, Torpedo Bomber2
Crew 6 - 81,2,5
Engine (Type) 2: Mitsubishi Ha-1041,2, Mitsubishi Ha-104 (Army Type 4)5
Cylinders Radial1, Radial 142, Radial 185
Cooling Air5
Net HP 1,900 each1,2,5
Propeller blades 42, 4 metal blade constant speed5
Dimensions  
Span 73' 9.75"1,2, 73' 9 13/165
22.5 m1,2,5
Length 61' 4 7/32"5, 61' 4.25"1,2
18.7 m1,2,5
Height 18' 4.5"2, 25' 3 5/32"5, 25' 3 1/8"1
5.6 m2, 7.7 m1,5
Wing area 708.8 sq ft1, 708.801 sq ft5
65.85 sq m1,5
Weight  
Empty 19,068 lb1,5, 19,070 lb2
8,649 kg1,5, 8,650 kg2
Loaded 30,347 lb1,2,5
13,765 kg1,2,5
Performance  
Speed at 19,980' / 6,090 m 334 mph1,2,5
537 kph1,2,5
Cruising Speed 249 mph2
400 kph2
Cruising Speed at 26,245' / 8,000 m 249 mph5
400 kph5
Climb 1,476'/minute2
450 m/minute2
Climb to 19,685' / 6,000 m 14 minutes 30 seconds1,2,5
Service Ceiling 31,070'1,2,5
9,470 m1,2,5
Range 1,740 miles1,2,5
2,800 km1,2,5
Maximum range 2,360 miles2,5
3,800 km2,5
Armament  
Nose 1: 12.7 mm MG2
1: 12.7 mm Type 11,5
Beam 1: 12.7 mm MG2
1: 12.7 mm Type 11
2: 12.7 mm Type 15
Tail 1: 12.7 mm MG2
1: 12.7 mm Type 11,5
Tail - later models 2: 12.7 mm Type 12,5
Turret - Dorsal 1: 20 mm2
1: 20 mm He-51,5
Bombs - Normal Load 1,102 lb2,5
500 kg2,5
Bombs - Maximum Load 1,764 lb5
800 kg5
Bombs 1,764 lb1,2
800 kg1,2
OR  
Torpedo 1: 2,359 lb1,5
1: 1,070 kg1,5
OR 1: 1,764 lb2,5
1: 800 kg2,5
OR  
Bombs - kamikaze 6,393 lb1,5
2,900 kg1,5
  Mitsubishi Ki-67-I Hiryu
Type Bomber3, Medium Bomber4, Torpedo Bomber4
Crew 6 - 83,4
Engine (Type) 2: Mitsubishi Ha-1043, Mitsubishi Ha-104 (Army Type 4)4
Cylinders Radial4, Radial 143
Cooling Air3
Net HP 1,900 each3,4
Dimensions  
Span 73' 9.75"4, 73' 10"3
22.5 m4
Length 61' 4"3, 61' 4.25"4
18.7 m4
Height 25' 3"3, 25' 3.25"4
7.7 m4
Wing area 708.86 sq ft4
65.85 sq m4
Weight  
Empty 19,068 lb4
8,649 kg4
Loaded 30,346 lb4, 30,347 lb3
13,765 kg4
Performance  
Speed at 19,685' / 6,000 m 334 mph4
537 kph4
Speed at 19,980' / 6,090 m 334 mph3
Cruising speed 249 mph4
400 kph4
Climb to 19,685' / 6,000 m 14 minutes 30 seconds4
Service ceiling 31,070'3,4
9,470 m4
Range 2,360 miles3
Range - Maximum 2,360 miles4
3,800 km4
Armament 4: MG3
1: 20 mm3
Nose 1: 0.5" / 12.7 mm Type 1 MG4
Beam 2: 0.5" / 12.7 mm Type 1 MG4
Turret - Dorsal 1: 20 mm Ho-54
Turret - Tail 1: 0.5" / 12.7 mm Type 1 MG4
Bombs 1,764 lb3, 1,765 lb4
800 kg4
OR  
Torpedo 1: Type 91 or Type 944

Sources:

  1. Fighting Aircraft of World War II, Editor: Karen Leverington, 1995
  2. Aircraft of WWII, Stewart Wilson, 1998
  3. World War II Airplanes Volume 2, Enzo Angelucci, Paolo Matricardi, 1976
  4. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
  5. Japanese Aircraft of the Pacific War, René J Francillon, 1970
20th Century American Military History Crucial Site