Ki-30 "Ann", Japanese Light Bomber

Photograph of Ki-30 "Ann" aircraft

U.S. Navy. Via Francillon (1979)

Mitsubishi Ki-30 "Ann"





47’9” by 33’11” by 11’12”
14.55m by 10.34m by 3.645m
Wing area 329.2 square feet
30.6 square meters


4915-7324 lbs
2230-3322 kg

Maximum speed      

263 mph 13,125 feet
423 km/h at 4000 meters
Cruise speed 236 mph
380 km/h

Climb rate

27 feet per second
8.2 meters per second

Service ceiling

28,117 feet
8570 meters

Power plant

One 850 hp (708 kW) Mitsubishi Ha-5 KAI 14-cylinder two-row radial engine driving a variable pitch three bladed metal propeller.


One 7.7mm Type 89 machine gun fixed in wing
One 7.7mm Type 89 machine gun in rear cockpit.

Bomb load

3 100kg (220 lg) bombs or equivalent


1056 miles
1700 km


638 at Mitsubishi Jukogyo K.K. (Nagoya) and 68 at Tachikawa Dai-Ichi Rikugun by 1941.

"Ann" was developed for the China Incident in the mid-1930s, a period of rapid modernization of the Japanese Army Air Force. Mitsubishi and Kawasaki were instructed in May 1936 to design prototype light bombers by December to meet a challenging set of requirements. The Mitsubishi team under Komamura designed an aircraft incorporating many then-novel features, including a double-row radial engine, variable-pitch propeller, internal bomb bay and split flaps. However, an attempt to include retractable landing gear was abandoned when wind tunnel tests suggested the reduction in drag would not make up for increased weight and complexity. The prototype flew on 28 February 1937, its only significant deficiency being that it was slightly over the specified weight. Mass production began in March 1938.

The design proved highly reliable in China, where escort by Ki-27 "Nates" helped ensure a low loss rate. However, "Ann" was obsolete by the time war broke out in the Pacific. Though she played an important role in the Philippines in 1942, again under conditions of Japanese air supremacy, she suffered heavy losses wherever Allied fighters were operating and was soon withdrawn from front-line service. The few survivors were expended as kamikazes late in the war.

Nine of these aircraft were given to the Thais and were used against the French in Indochina during the border incident of January 1941.


Francillon (1979)

Wilson (1998)

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