Model Variants (Including Prototypes)
Ki-49-I - Initial Production Model Designation
Ki-49-IIa - "Improved" Ki-49-I Model; fitted with uprated 2 x Nakajima Ha-109 radial engines; improved armor and fuel protection; improved defensive armament.
Ki-49-IIb - At least three of the existing 7.7mm machine guns replaced by heavy caliber 12.7mm Ho-103 types for improved defensive armament.
Ki-49-III - Prototype Models fitted with 2,420 horsepower engines; 6 examples produced.
Ki-58 - Experimental Escort Fighter based on the Ki-49 platform.
Ki-80 - Experimental Escort Bomber based on the Ki-49 platform.
Army Type 100 Heavy Bomber Model 1 - Official Designation for the Ki-49-I production model.
Army Type 100 Heavy Bomber Model 2A - Official Designation for the Ki-49-IIa production model.
Army Type 100 Heavy Bomber Model 2B - Official Designation for the Ki-49-IIb production model.