Mitsubishi Ki-51

The Mitsubishi Ki-51 (Army designation is Type 99 attack aircraft; Allied codename Sonia) was a light bomber/dive bomber aircraft in service with the Imperial Japanese Army during World War II. It first flew in mid-1939. Initially deployed against Chinese forces, it proved to be too slow to hold up against the fighter aircraft of the other allied powers. However, it performed a useful ground attack role in the China-Burma-India theatre, notably from airfields too rough for many other aircraft. As the war drew to a close, they began to be used in kamikaze attacks. Total production was around 2385 units.

Mitsubishi Ki-51
Class Aircraft
Type Attack
Manufacturer Mitsubishi Aircraft Corporation
Origin Japan
Country Name Origin Year
Japan 1939
Country Name Operational Year Retirement Year
Japan 1939 1945 View
ManufacturerName Production From Production To Quantity
Mitsubishi Aircraft Corporation 2385 View

Role Type 99 Attacker
Manufacturer Mitsubishi Jukogyo KK
First flight mid-1939
Primary user Imperial Japanese Army Air Force
Number built 2385

General characteristics

  • Crew: Two (Pilot and rear gunner)
  • Length: 9.20m (30 ft 2.5 in)
  • Wingspan: 12.10 m (39 ft 8.25 in)
  • Height: 2.73 m (8 ft 11.5 in)
  • Wing area: 24.02 m (258.56 ft)
  • Empty: 1,873 kg (4129 lb)
  • Maximum takeoff: 2920 kg (6437 lb)
  • Powerplant: 1x Mitsubishi Ha-26-II radial piston engine, rated at 940 hp (691 kW)


  • Maximum speed: 425 km/h (264 mph)
  • Range: 1,060 km (659 miles)
  • Service ceiling: 8,270 m (31,070 ft)


  • 2 7.7mm Type 97 machine guns forward firing(replaced with 2 12.7mm Ho-103 machine guns in later models)
  • 1 7.7mm Type 89 machine gun rear firing machine gun.
  • 250kg (551lbs) of ordinance.

End notes