Mitsubishi Type 1 Attack Bomber / G4M (Betty)
Redefined Naval bomber
operations because of its extremely long range. For comparison,
RAF crews struggled 900 miles to Germany, Japanese Navy crews
hauled similar bomb loads to targets twice as far away in spacious,
well equipped G4M1 Betty bombers, making it one of the outstanding bombers of its time.
Notorious for its tendency to catch fire due
to the bomber's large unprotected fuel tanks that tended to explode when
hit by even short burst of enemy fire. Later, attempts were made to protect the fuel tanks.
The tail position was armed with a 20mm cannon Type 99 flexible cannon type 1 (99Shiki 20mm Senkai-kiju 1gata). The weapon had a round magazine with 45 rounds that weighed 16.5 kg (36.38 pounds). Alternately, there was a round magazine with 30 rounds.
The first bomber model of series, with 1,140 kW (1,530 hp) Mitsubishi MK4A Kasei Model 11 engines driving three-blade propellers. The following modifications were made during production
The Model 12 was possibily an interim model or designation that ultimately disappeared. The Model 12 is cited in Japanese plan for production aircraft, September 1943 from plant Suzuka, yet in October 1943 delivering Model 11 only.
G4M2 Model 22
The first prototype made in November 1942 and flew in December 1942.
G6M1-L Betty (Transport Version)
Transport version of the G4M1 Betty bomber. This variant had several differences, including lack of a middle row of windows on the sides of the nose. The pitot tube was more forward on the nose. The waist blister were nearer to the wing and struts different. The position of the antennas on the top of the fuselage was different and this model lacked a loop antenna. The shape of the fuselage door was different. The type lacked armament.
2,446 Bettys were built.
Thanks Jim Long and Richard Dunn for additional information.
Crew 7-10 (pilot, co-pilot, navigator, mechanic, gunner, gunner, gunner)
Engine 2 x Mitsubishi MK4P Kasei 21 fourteen-cylinder air-cooled
Maximum Speed 236 km/h
Range 3,270 miles
Armament (nose, turret, waist) 7.7mm machine guns (tail) 20mm cannon
Bomb load 1 x 800 kg aerial torpedo or up to 1,000 kg of bombs