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Japan's Imperial Army flag

Japan's Kawasaki Ki-100 fighter, Army Type 5

Design

The Kawasaki Ki-100 was made by combining Ki-61-II airframes with the Mitsubishi Ha-112-II radial engine.1,2

The designers of the Ki-100 studied the engine mounting system on the Focke-Wulf 190A to determine a method for mounting the small diameter Ha-112 radial.1,2

Engine

The Kawasaki Ha-140 engine was to be used but the Akashi factory was destroyed in an air raid.1,2,3

As there were airframes waiting to have engines installed, Kawasaki converted three by installing the Mitsubishi Ha-112-II engine.3 Once these were show to be successful the rest of the airframes were converted by May 1945.3

Prototype

The prototype of the Ki-100 first flew on February 1, 1945.1,2,3 The prototype was found to be maneuverable and high performance.1 Two more prototypes were constructed and showed excellent results in tests.1

The Ki-100-II prototypes first flew in May and June 1945.1

Production

  • Prototypes: 31
  • Kawasaki Ki-100-Ia, Army type 5 Fighter Model 1A: 2721
    • The Imperial Japanese Army Air Force ordered 272 Ki-100-Ia conversions.1 Deliveries began in March 1945.1
  • Kawasaki Ki-100-Ib: 993, 1062, 1181
    • Entered production in May 1945.1
  • Kawasaki Ki-100-II: 22, 31,3
  • Total: 3961,2
    • Manufacturer: Kawasaki Kokuki Kogyo K.K.2
    • Production: February - August 19452
    • 275 prototypes and Ki-100-Ias converted from Ki-61-II airframes.1,2

Variants

  • Kawasaki Ki-100-Ia, Army type 5 Fighter Model 1A: Converted from Ki-61-II airframes.1,2
  • Kawasaki Ki-100-Ib: Fuselage was cut down behind the cockpit.1,3 New canopy allowed for all around vision.1
  • Kawasaki Ki-100-II: Only prototypes built.1,2,3 Was to have turbo charged Ha-112 engine.1,3 Was improved aerodynamically.2

Usage

The Ki-100 was used as an excellent high altitude interceptor.2

Highly Successful

One Ki-100 unit destroyed fourteen United States Navy Hellcats without a loss to themselves.1

Specifications

  Kawasaki Ki-1001
Type Fighter1
Crew 11
Engine (Type) Mitsubishi Ha-112-II1
Cylinders Radial 141
Cooling  
Net HP 1,5001
Propeller blades 31
Dimensions  
Span 39' 4.5"1
12 m1
Length 28' 11.25"1
8.82 m1
Height 12' 3.5"1
3.75 m1
Wing area  
Weight  
Empty  
Loaded  
Performance  
Speed  
Cruising speed  
Climb  
Service ceiling  
Range  
Range with drop tanks  
Armament  
Nose 2: 20 mm1
Wings 2: 12.7 mm MG1
Bombs - under wings 2: 551 lb1
2: 250 kg1
  Kawasaki Ki-100-I1
Type  
Crew  
Engine (Type)  
Cylinders  
Cooling  
Net HP  
Propeller blades  
Dimensions  
Span  
Length  
Height  
Wing area  
Weight  
Empty 5,567 lb1
2,525 kg1
Loaded 7,705 lb1
3,495 kg1
Performance  
Speed @ 19,685' /
6,000 m
360 mph1
579 kph1
Speed @ 32,810' /
10,000 m
332 mph1
534 kph1
Cruising speed 248 mph1
400 kph1
Climb 3,280'/minute1
1,000 m/minute1
Climb to 16,405' /
5,000 m
20 minutes1
Service ceiling 36,090'1
11,000 m1
Range 870 miles1
1,400 km1
Range with drop tanks 1,367 miles1
2,200 km1
Armament  
  Kawasaki Ki-100-Ia/b3
Type Fighter3
Crew 13
Engine (Type) Mitsubishi Ha-112-II3
Cylinders Radial 143
Cooling  
Net HP 1,5003
Propeller blades  
Dimensions  
Span 39' 4.4"3
12 m3
Length 28' 10.5"3
8.8 m3
Height 12' 3.6"3
3.75 m3
Wing area 215.3 ft2 3
20 m2 3
Weight  
Empty 5,952 lb3
2,700 kg3
Loaded 8,091 lb3
3,670 kg3
Performance  
Speed @ 32,810' /
10,000 m
367 mph3
590 kph3
Cruising speed 217 mph3
350 kph3
Climb  
Climb to 32,810' /
10,000 m
20 minutes3
Service ceiling 35,007'3
10,670 m3
Range 1,243 miles3
2,000 km3
Range with drop tanks  
Armament  
Nose 2: 12.7 mm Ho-103 Type I MG3
Wings 2: 20 mm Ho-53
Bombs 2: 551 lb3
2: 250 kg3
  Kawasaki Ki-100-II2
Type Fighter2
Crew 12
Engine (Type) Mitsubishi Ha-112-II Ru2
Cylinders Radial 142
Cooling Air2
Net HP 1,5002
Propeller blades  
Dimensions  
Span 39' 4"2
Length 28' 11"2
Height 12' 3"2
Wing area  
Weight  
Empty  
Loaded 8,091 lb2
Performance  
Speed @ 19,685' /
6,000 m
454 mph2
Cruising speed  
Climb  
Service ceiling 36,090'2
Range 1,118 miles2
Range with drop tanks  
Armament 2: MG2
2: 20 mm2
Bombs 1,100 lb2

Sources:

  1. Aircraft of WWII, Stewart Wilson, 1998
  2. World War II Airplanes Volume 2, Enzo Angelucci, Paolo Matricardi, 1976
  3. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
20th Century American Military History Crucial Site