World War II Vehicles, Tanks and Airplanes, picture of P-51 Mustang
World War II Vehicles, Tanks and Airplanes, picture of T-34/85
World War II Vehicles, Tanks and Airplanes, picture of Fw-190
World War II Vehicles, Tanks and Airplanes, picture of Churchill
wwiivehicles.com ©2016
Search:
Japan's Imperial Navy flag

Japan's Mitsubishi G4M bomber, Navy Type 1 Attack Bomber
Nickname: Hamaki (cigar), Flying Cigar, Flying Lighter
Allied code name: Betty

Photos

  • Mitsubishi Type 01 bomber
  • Mitsubishi Type 01 bomber
  • Mitsubishi G4M Model 34 bomber
  • Mitsubishi G4M Model 34 bomber
  • Mitsubishi G4M bomber
  • Mitsubishi G4M bomber

Design

The Mitsubishi G4M was designed by Kiro Honjo in 1937 to meet a requirement for a long range land bomber for the Imperial Japanese Navy. It was to fly at 9,845'/10,000' at 247/250 mph and have a range of 2,300/2,302 miles while carrying a torpedo.

The G4M was to replace the Navy Type 96 Attack Bomber.

Initially the Navy called for engines with 1,000 HP each, but it was found that they wouldn't be able to power the aircraft to meet the performance requirements. A pair of Mitsubishi Kasei 14 cylinder engines were fitted.

To save weight for the addition of fuel, the G4M had no armor to protect it's fuel tanks. It carried 1,078 gallons of fuel in the wings.

Cockpit

The pilots sat next to each other in the cockpit and had an escape hatch in the roof. The navigator was below and to the rear of them.

Vulnerable Fuel Tanks

After starting to attack Port Moresby, New Guinea the G4M1s started to encure greater losses as Allied fighters were more prevelant than before. This lead to the need for better protected fuel tanks.

G4M2

Had the blisters on the sides of the fuselage removed. These were replaced by a turret on the top of the fuselage.

  • Bomber Range and Bomb Load Comparison

Prototype

A full scale model was inspected in August - September 1938.

The G4M1 prototype was completed in September 1939.

The Mitsubishi G4M1 prototype was first flown on October 23, 1939. The pilot was Katsuzo Shima.

The second prototype was able to go 278 mph and fly 3,400 miles.

The G4M2 prototype was completed in November 1942. The third prototype had bomb bay doors and became standard on 65th G4M2 produced.

The first G4M3 prototype was completed in January 1944.

Production

The first G4M2 flew in November 1942.

Production ended in August 1945.

  • Prototypes, 12-Shi: 2
    • Production: September 1939 - February 1940
    • Manufacturer: Mitsubishi at Nagoya
  • Mitsubishi G6M1: 30
    • Production: 1940
    • Manufacturer: Mitsubishi at Nagoya
  • Mitsubishi G4M1, Navy Type 1 Attack Bomber Model 11: 1,200
    • Production: January 1941 - January 1944
    • Manufacturer: Mitsubishi at Nagoya
  • Mitsubishi G4M2, Navy Type 1 Attack Bomber Model 22: 1,154
    • Production: November 1942 - August 1945
    • Manufacturer: Mitsubishi at Nagoya (640), Mitsubishi at Okayama (514)
    • Mitsubishi G4M2 Model 22, 22A, 22B: 350
    • Mitsubishi G4M2a, Navy Type 1 Attack Bomber Model 24: 14
    • Mitsubishi G4M2b Model 25: 1
  • Mitsubishi G4M3: 60
    • Production: December 1943 - August 1945
  • Total: 2,446
    • Manufacturer: Mitsubishi Jukogyo K.K.
    • Production: September 1939 - August 1945
  • Bomber Production Comparison

Variants

  • Mitsubishi G6M1: Heavy escort fighter.
  • Mitsubishi G6M1-K: Trainer. Converted G6M1s.
  • Mitsubishi G6M1-L2: Paratroop transports. Converted G6M1s.
  • Mitsubishi G4M1: Prototype. Production. Deliveries started in April 1941.
  • Mitsubishi G4M1 Model 11, Navy Type 1 Attack Bomber Model 11: First production.
  • Mitsubishi G4M1 Model 12, Navy Type 1 Attack Bomber Model 12: More powerful Kasei 15 engines. Fuel tanks were protected by rubber sheets and sponge. Carbon dioxide fire extinguishers were added.
  • Mitsubishi G4M2, Navy Type 1 Attack Bomber Model 22: Increased armament and fuel. The engines had water-methanol injection. Tailplane area was increased, wings and tails tips rounded, nose glazing increased, bombardier's window improved, two 7.7 mm machine guns added to nose, dorsal blister replaced by 20 mm turret, and a 350 gallon auxiliary fuel tank in the fuselage.
  • Mitsubishi G4M2 ??: Had Kasei 21 engines with water injection and 4 blade propellars.
  • Mitsubishi G4M2 Model 22: Had more powerful engine. Enlarged tailplane. Wingtips were rounded. Had a laminar flow wing section. Added dorsal turret. More fuel.
  • Mitsubishi G4M2 Model 22A: Lateral 7.7 mm machine guns replaced by 20 mm Type 99 Model 1 guns.
  • Mitsubishi G4M2 Model 22B: All cannons were 20 mm Type 99 Model 2 guns.
  • Mitsubishi G4M2a, Navy Type 1 Attack Bomber Model 24: Improved engine and bulging bomb bay doors installed.
  • Mitsubishi G4M2a Model 24A: Armament same as G4M2 Model 22A.
  • Mitsubishi G4M2a Model 24B: Armament same as G4M2 Model 22B.
  • Mitsubishi G4M2a Model 24C: Armament same as G4M2 Model 22B except there was an aded 13 mm Type 2 machine gun installed in the nose with the 7.7 mm.
  • Mitsubishi G4M2e Model 24J: Bomb bay doors removed and shackels to carry an Ohka was installed.
  • Mitsubishi G4M3: Had increased protection for the crew.
  • Mitsubishi G4M3 Model 34: New tail turret. Fuselage shorter. Dihedral tailplane. Protection for crew and fuel. First appeared in early 1944.
  • Mitsubishi G4M3 Model 34A: Transport and anti-submarine.
  • Mitsubishi G6M1, Navy Type 1 Wingtip Convoy Fighter: Additional armament was installed and was to be used as an escort fighter for the G3Ms then in China.
  • Mitsubishi G6M1-K, Navy Type 1 Large Land Transport: G6M1s converted to be transports.
  • Mitsubishi G6M-L2, Navy Type 1 Transport: Modified G6M1-Ks to become paratroop transports.
  • ???: Transport version.
  • ???: Trainer version.

Usage

Due to the ease at which the G4Ms blew up, American pilots nicknamed them the "flying cigarette lighter."

Units

1st, 4th, 702nd, 705th, 706th, 721st, 722nd, 751st, 752nd, 753rd, 755th, 761st, 762nd, 763rd, 765th, 951st, 1021st, Chitose, Genzan, Kanoya, Kisarazu, Misawa, Takao, Yokosuka Kokutais.

Trials

The Mitsubishi G4Ms became operational in 1940. The first G4M1 prototype was delivered to the Yokosuka Experimental Air Corps for trials in January 1940. The second was delivered in March 1940.

The Yokosuka Experimental Air Corps recommended that the G4Ms be equiped with more armament and used as escorts for the G3Ms then in use in China.

China

The first G4M1s were deployed in China in mid-1941. Their first mission was to attack Chungking.

Early War

During the first year of World War II the G4M was able to have success against the Allies. But soon it was outmatched by the Allied fighters coming to the front lines.

Prince of Wales and Repulse Sunk

Mitsubishi G4Ms helped in the destruction of the British HMS Prince of Wales and HMS Repulse on December 10, 1941.

Darwin

On February 19, 1942, G4M1s attacked Darwin, Australia for the first time.

The End of Admiral Yamamoto

The mastermind behind the early success in World War II of the Japanese was shot down by P-38s while being flown in a Mitsubishi G4M / G4M1 on April 18, 1943.

G4Ms with Ohka

The very first mission, March 21, 1945, of the G4M2e with Ohkas attached ended with all sixteen planes being shot down before the Ohkas were released.

Surrender

The G4Ms were used at the end of the war to carry the surrender delegation to Io Shima on August 19, 1945.

Specifications

  Mitsubishi G4M, Mitsubishi Type 01
Type Medium bomber
Crew 7
Engine (Type) 2: Mitsubishi MK4A Kasei 11
2: Kasei 21
Cylinders Radial, Radial 14
Cooling Air
Net HP 1,530 each
Propeller blades 3 metal blades
Fuel capacity - Wings 1,078 gallons
Dimensions  
Span 82' 0.25"
25 m
Height 19' 8.25"
6 m
Armament  
Tail 20 mm Type 99
60 rounds
Torpedo 1 or 2
  Mitsubishi G4M1
Type Bomber
Crew 7
Engine (Type) 2: Kasei 21
2: Mitsubishi Kasei 11 2: Mitsubishi MK4A Kasei 11
Cylinders Radial 14
Cooling Air
Net HP 1,530 each
Propeller blades 3 each
Dimensions  
Span 82', 82' 0.25"
25 m
Length 26' 7.5" , 65' 7"
20 m
Height 19' 8", 19' 8.25"
6 m
Weight  
Empty Model 11: 14,991 lb
Model 11: 6,800 kg
Loaded Model 11: 20,943 lb, 20,946 lb
Model 11: 9,500 kg
Performance  
Speed 276 mph
444 kph
Speed @ 13,780' /
4,200 m
266 mph
428 kph
Cruising speed 196 mph
315 kph
Service ceiling 29,000'
Range 3,132 miles, 3,749 miles
5,040 km
Range - without bombs 3,450 miles
5,555 km
Armament 1: 20 mm
4: MG
Bombs 1,760 lb
  Mitsubishi G4M1 Model 11
Dimensions  
Span 82' 0.25"
25 m
Length 65' 7 13/32"
20 m
Height 19' 8 7/32"
6 m
Wing area 840.927 sq ft
78.125 sq m
Weight  
Empty 14,991 lb
6,800 kg
Loaded 20,944 lb
9,500 kg
Performance  
Speed at 13,780' / 4,200 m 266 mph
231 kt
Cruising speed at 9,845' / 3,000 m 196 mph
170 kt
Climb to 22, 965' / 7,000 m 18 minutes
Range 3,256 nautical miles
Armament  
Nose 1: 7.7 mm Type 92
Dorsal 1: 7.7 mm Type 92
Beam 2: 7.7 mm Type 92
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M1 Model 12
Type Bomber
Engine (Type) 2: Mitsubishi MK4E Kasei 15
Cylinders Radial 14
Cooling Air
Net HP 1,530 each
Propeller blades 3 metal blades
Range 3,086 miles
Armament  
Nose 1: 7.7 mm Type 92
Dorsal 1: 7.7 mm Type 92
Beam 2: 7.7 mm Type 92
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M2
Type Land based Navy medium bomber
Crew 7
Engine (Type) 2: Mitsubishi Kasei 25
2: Mitsubishi MK4P Kasei 21
2: Mitsubishi Kasei 21
OR 2: Mitsubishi Kasei 25/25b
Cylinders Radial
Net HP 1,800 each
21: 1,800 each
25/25b: 1,825 each
Propeller blades 3 each
Fuel capacity 1,428 gallons
6,490 liters
Dimensions  
Span 82', 82' 1/8", 82' 0.25"
25 m
Length 66', 67' 7 3/8", 67' 7 7/8"
20 m
Height 19' 8", 19' 8.25", 20'
6 m
Wing area 840.93 ft2 , 841 ft2
78.12 m2 , 78.125 m2
Weight  
Empty 17,953 lb, 17,990 lb
8,160 kg
Model 22: 17,990 lb
Model 22: 8,160 kg
Loaded 27,500 lb, 27,558 lb
12,500 kg
Model 22: 27,558 lb
Model 22: 12,500 kg
Performance  
Speed at 15,000' / 4,600 m 270 mph
438 kph
Speed at 15,090' / 4,600 m 272 mph
438 kph
Cruising speed 196 mph
315 kph
Climb to 26,245' / 8,000 m 32.4 minutes
Climb to 26,250' / 8,000 m 32 minutes
Service ceiling 29,365'
8,950 m
Range 2,694 miles, 2,982 miles, 3,765 miles
4,335 km, 4,800 km, 6,059 km
Armament  
Tail turret 1: 20 mm
1: 20 mm Type 99
Nose 2: 7.7 mm MG
2: 7.7 mm Type 92
2: 7.92 mm MG
Beam positions 1: 7.7 mm Type 92
2: 7.7 mm MG, 7.7 mm Type 92
2: 7.92 mm MG
OR 1: 20 mm
Dorsal turret 1: 20 mm
1: 20 mm Type 99
Bombs 2,200 lb, 2,205 lb
1,000 kg
OR  
Torpedo 1,760 lb, 1,764 lb
800 kg
  Mitsubishi G4M2 Model 22, 22A, 22B
Engine (Type) 2: Mitsubishi MK4P Kasei 21
Cylinders Radial 14
Cooling Air
Net HP 1,800 each
Propeller blades 4 metal blades
Dimensions  
Span 82' 0.25"
25 m
Length 65' 7 13/32"
20 m
Height 19' 8 7/32"
6 m
Wing area 840.927 sq ft
78.125 sq m
Weight  
Empty 17,990 lb
8,160 kg
Loaded 27,558 lb
12,500 kg
Performance  
Speed at 15,090' / 4,600 m 272 mph
236 knots
Cruising speed at 13,125' / 4,000 m 196 mph
170 knots
Climb to 26,245' / 8,000 m 30 minutes 24 seconds
Service ceiling 29,365'
8,950 m
Range 3,270 nautical miles
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model I
Beam 2: 7.7 mm Type 92
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M2a
Engine (Type) 2: Mitsubishi MK4T Kasei 25
Net HP 1,850 each
  Mitsubishi G4M2a Model 24, 24A, 24B
Engine (Type) 2: Mitsubishi MK4T Kasei 25
Cylinders Radial 14
Cooling Air
Net HP 1,825 each
Propeller blades 4 metal blades
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model I
Beam 2: 7.7 mm Type 92
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M2b Model 25
Engine (Type) 2: Mitsubishi MK4V Kasei 27
Cylinders Radial 14
Cooling Air
Net HP 1,795 each
Propeller blades 4 metal blades
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model I
Beam 2: 7.7 mm Type 92
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M2c Model 26
Engine (Type) 2: Mitsubishi MK4T-B Ru Kasei 25b Ru
Cylinders Radial 14
Cooling Air
Net HP 1,825 each
Propeller blades 4 metal blades
  Mitsubishi G4M2d Model 27
Engine (Type) 2: Mitsubishi MK4T-B Kasei 25b
Cylinders Radial 14
Cooling Air
Net HP 1,825 each
Propeller blades 4 metal blades
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model I
Beam 2: 7.7 mm Type 92
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M2e Model 24J
Engine (Type) 2: Mitsubishi MK4T Kasei 25
Cylinders Radial 14
Cooling Air
Net HP 1,825 each
Propeller blades 4 metal blades
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model 2
Beam 2: 20 mm Type 99 Model 2
Turret - Tail 1: 20 mm Type 99 Model 2
  Mitsubishi G4M3
Engine (Type) 2: Mitsubishi Kasei 21
OR 2: Mitsubishi Kasei 25/25b
Net HP 21: 1,800 each
25/25b: 1,825 each
Dimensions  
Span 82' 0.25"
25 m
Length 63' 11.75"
19.5 m
Height 19' 8.25"
6 m
  Mitsubishi G4M3 Model 34
Engine (Type) 2: Mitsubishi MK4T Kasei 25
Cylinders Radial 14
Cooling Air
Net HP 1,825 each
Propeller blades 4 metal blades
Dimensions  
Span 82' 0.25"
25 m
Length 65' 7 13/32"
20 m
Height 19' 8 7/32"
6 m
Wing area 840.927 sq ft
78.125 sq m
Weight  
Empty 18,409 lb
8,350 kg
Loaded 27,558 lb
12,500 kg
Performance  
Speed at 16,895' / 5,150 m 292 mph
254 knots
Cruising speed at 13,125' / 4,000 m 196 mph
170 knots
Climb to 22,965' / 7,000 m 20 minutes 10 seconds
Service ceiling 30,250'
9,220 m
Range 2,340 nautical miles
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model I
Beam 2: 7.7 mm Type 92
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M3a Model 34A
Engine (Type) 2: Mitsubishi MK4T Kasei 25
Cylinders Radial 14
Cooling Air
Net HP 1,825 each
Propeller blades 4 metal blades
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model I
Beam 2: 20 mm Type 99 Model I
Turret - Tail 1: 20 mm Type 99 Model I
  Mitsubishi G4M3 Model 36
Engine (Type) 2: Mitsubishi MK4T-B Ru Kasei 25b Ru
Cylinders Radial 14
Cooling Air
Net HP 1,825 each
Propeller blades 4 metal blades
Armament  
Nose 2: 7.7 mm Type 92
Turret - Dorsal 1: 20 mm Type 99 Model 2
Beam 2: 20 mm Type 99 Model 2
Turret - Tail 1: 20 mm Type 99 Model 2
  Mitsubishi G6M1
Type Heavy Escort Fighter
Crew 10
Dimensions  
Span 82' 0.25"
25 m
Length 65' 7 13/32"
20 m
Height 19' 8 7/32"
6 m
Wing area 840.927 sq ft
78.125 sq m
Weight  
Empty 15,432 lb
7,000 kg
Loaded 20,944 lb
9,500 kg
Armament  
Nose 1: 7.7 mm Type 92
Beam 1: 20 mm Type 99 Model I
Turret - Tail 1: 20 mm Type 99 Model I
Ventral - Forward 1: 20 mm Type 99 Model I
Ventral - Rear 1: 20 mm Type 99 Model I

Sources:

  1. Aircraft of World War II, General Editor: Jim Winchester, 2004
  2. Fighting Aircraft of World War II, Editor: Karen Leverington, 1995
  3. Aircraft of WWII, Stewart Wilson, 1998
  4. World War II Airplanes Volume 2, Enzo Angelucci, Paolo Matricardi, 1976
  5. Aeronautics Aircraft Spotters' Handbook, Ensign L. C. Guthman, 1943
  6. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
  7. Japanese Aircraft of the Pacific War, René J Francillon, 1970
20th Century American Military History Crucial Site