Mitsubishi G4M

The Mitsubishi G4M (Imperial Japanese Navy designation: Type 1 land-based attack aircraft; Allied identification name was Betty) was a twin-engined, land-based bomber aircraft used by the Imperial Japanese Navy (IJN) in World War II. 

The G4M was first used by in combat on September 13, 1940, in mainland China. As torpedo bombers, the G4M was most notable for being employed in the sinking of the British battleships Prince of Wales and the Repulse off the coast of Malaya in 1941. The bomber remained in service with the IJN until the end of the Second World War.

Mitsubishi G4M
Class Aircraft
Type Bomber
Manufacturer Mitsubishi Aircraft Corporation
Origin Japan
Country Name Origin Year
Japan 1939
Country Name Operational Year Retirement Year
Japan 1941 1945 View
ManufacturerName Production From Production To Quantity
Mitsubishi Aircraft Corporation 2435 View

Role Medium bomber
Manufacturer Mitsubishi
Designer Kiro Honjo
First flight 23 October 1939
Introduction June 1941
Retired 1945
Primary user Imperial Japanese Navy Air Service
Number built 2435

General characteristics

  • Crew: 7: pilot, co-pilot, navigator/bombardier, radio operator/gunner, three gunners
  • Length: 19.6 m (64 ft 4 in)
  • Wingspan: 24.9 m (81 ft 8 in)
  • Height: 6 m (19 ft 8 in)
  • Empty weight: 8,160 kg (17,990 lb)
  • Max takeoff weight: 12,500 kg (27,557 lb)
  • Powerplant: 2 x Mitsubishi Kasei 25 radial engines, 1,380 kW (1,850 hp) each


  • Maximum speed: 437 km/h (270 mph)
  • Range: 4,725 km (one way) (2,935 mi)
  • Service ceiling 8,950 m (29,350 ft)


  • Guns: 2 x 20mm Type 99 cannon, 4 x 7.7 mm Type 92 machine guns
  • Bombs: Up to 1,000 kg (2,200 lb) of bombs or single Type 91 torpedo. The heaviest single bomb it can hold is 800 kg.

End notes