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Mitsubishi Ki-21
Type: Heavy Bomber
Origin: Mitsubishi
Crew: Seven
Allied Code Name: Sally
Models: Ki-21-I, Ki-21-IIa and Ki-21-IIb
First Flight: November 1936, Ki-21-II: Mid-1940
Service Delivery: 1937
Final Delivery: September 1944
Production: 2,064 (351 built by Nakajima)
Powerplant:
Ki-21-I:
Model: Nakajima Ha-5-Kai
Type: 14-cylinder two-row radial engine
Number: Two       Horsepower: 850 hp

Ki-21-II:
Model: Mitsubishi Ha-101
Type: 14-cylinder two-row radial engine
Number: Two       Horsepower: 1,490 hp

Dimensions:
Wing Span: 22.5m (73 ft. 9.75 in.)
Length: 16.0m (52 ft. 6 in.)
Height: 4.85m (15 ft. 11 in.)
Wing Area: N/A

Weights:
Empty (Ki-21-I): 4691 kg (10,341 lb)
Empty (Ki-21-II): 6070 kg (13,382 lb)
Loaded (Ki-21-I): 7492 kg (16,517 lb)
Loaded (Ki-21-II): 9710 kg (21,395 lb)

  

Performance:
Max. Speed (Ki-21-I): 432 km/h (268 mph)
Max. Speed (Ki-21-II): 478 km/h (297 mph)
Initial Climb (Ki-21-I): 1,150 ft/min (350 m/min)
Initial Climb (Ki-21-II): 1,640 ft/min (500 m/min)
Service Ceiling (Ki-21-I): 8600m (28,220 ft.)
Service Ceiling (Ki-21-II): 10000m (32,800 ft.)
Max. Range (Ki-21-I): 2700km (1,678 miles)
Max. Range (Ki-21-II): 2200km (1,370 miles)

Armament:
Four manually aimed machine guns
One Remote aimed machine gun in tail

Bomb Load:
Ki-21-I
1,653 lb. (750 kg) of bombs carried internally

Ki-21-II
2,205 lb. (1000 kg) of bombs carried internally

Avionics:
N/A
Variants:
Ki-21-Ib: Enlarged flaps and bomb bay, increased
   crew armour
Ki-21-Ic: Additional machine gun
Ki-21-IIb: dorsal greenhouse replaced with turret
   mounted 12.7mm machine gun
Ki-57 "Topsy": Transport version (500 built)
Comments:
The Ki-21 was designed in response to a demanding specification from the Imperial Japanese Army for a heavy bomber in 1936. The design was chosen over the Nakajima Ki-19 and suffered severe teething problems and specification changes but eventually was put into production in 1937 by Mitsubishi and Nakajima in 1938. Serving as the Army's premier bomber through the late 30's the type suffered heavily in Burma against the Hurricane and eventually faded from service by 1943.
Sources:
The Complete Encyclopedia of World Aircraft, 1997, Barnes & Nobles Books, ISBN: 0 7607 0592 5
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