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G4M "Betty"

Long Range Bomber

Mitsubishi

Mitsubishi G4M1 'Betty' from Kisaratzu airgroup, Naval Forces of Japan, Kavieng, August, 1942. © Michael Bykov

Mitsubishi G4M1 "Betty" from Kisaratzu airgroup, Naval Forces of Japan, Kavieng, August, 1942.

Approximately 2,446 Betty's of all variants were built.

G4M1 'Betty' Specification
G4M1mod11 G6M1-L2 G4M1mod12 G4M2mod22 G4M2mod24 G4M3mod34
Crew 6-7 6-7 6-7 6-7 6-7 6-7
Dimensions
Fuselage length, m 19,972 19,940 19,972 19,630 19,630 19,500
Wing span, m 24,879 24,8792 24,879 24,890 24,890 25,000
Wing area, m2 78,125 78,125 78,125 78,000 78,000 78,000
Height, m 4,898 4,898 4,898 4,898 4,898 4,898
Weight:
Empty weight, kg 6800 6800 7164 7300 7420 8300
Маximum takeoff weight, kg 12500 12500 14000 15395 15170 1300
Capacity of petrol tanks, l 4780 4780 5600 6200 6200 4400
Power Plant
Two Mitsubishi Kasei Radial Kasei-11 Kasei-11 Kasei-15 Kasei-21 Kasei-25 Kasei-25
Power, hp/at alt. m at take-off 2x1530 2x1530 2x1530 2x1800 2x1825 2x1825
1 border 1410/2000 1410/2000 1410/2600 1575/1800 1680/2100 1680/2100
2 border 1340/4000 1340/4000 1280/6000 1410/4800 1540/5500 1540/5500
Performance
Speed, km/h at altitude m maximum 428/4200 435/4200 452/6000 437/4600 438/4600 481/5065
cruise 325/4000 330/4000 350/4000 322/4000 322/4000 376/4700
landing 128 128 129 130 130 130
Rate of climb, m/min 18/7000 18/7000 15/7000 14/5000 13/57000 20/7000
Ceiling, m 8240 8800 9660 8950 8950 9700
Maximum range, km 6034 6200 5719 5400 5400 4330
Armament
Torpedo, (pc.) 1 3000kg 1 1 1 1
Bombs, kg 1000 cargo 1000 1000 1000 1000
Cannon, machine guns 1x20, 4x7,71 - 1x20, 4x7,71 2x20, 3x7,71 4x20, 1x7,71 4x20, 1x13,1

Modifications

  • G4M Prototype with two Mitsubishi Kasei 11 (1,530-hp) radial engines. First flown on October 23, 1939. After satisfactory trials it was ordered into production as the G4M1 Model 11.
  • G4M1 Model 11 The first production aircraft entered operational service during the Summer of 1941.
  • G4M2 Model 22 is equipped with two Mitsubishi MK4P Kasei 21 (1,800-hp) radial engines, leading to two subvariants, the 22A and 22B models which varied only in armament configurations.
  • G4M2a Model 24 is equipped with two Mitsubishi MK4T Kasei 25 (1,825-hp) radial engines and bulged bomb bay doors, leading to two subvariants, the 24A and 24B models which varied only in armament configurations.
  • G4M2e Model 24J is a significant modification of navy G4M2a Model 24B & 24C aircraft which allowed the aircraft to carry the MXY7 piloted missle.
  • G4M3 Model 34 was intended to fix several design flaws by introducing self-sealing fuel tanks and armor protection. However, this model appeared too late in the war to have any significant impact.
  • G6M1 fulfilled an urgent requirement for an long range escort fighter during the Sino-Japanese war. 30 airframes were produced in this major variant but proved to be unsuccessful in this role. Most of the airframes were later converted to G6M1-K trainers or G6M10L2 transports.

References

  • "Encyclopedia of military engineering " /Aerospace Publising/
  • "Japan Warplanes of World War II" /Oleg Doroshkevich/

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