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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.

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.

Engine

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

As there were airframes waiting to have engines installed, Kawasaki converted three by installing the Mitsubishi Ha-112-II engine. Once these were show to be successful the rest of the airframes were converted by May 1945.

Prototype

The prototype of the Ki-100 first flew on February 1, 1945. The prototype was found to be maneuverable and high performance. Two more prototypes were constructed and showed excellent results in tests.

The Ki-100-II prototypes first flew in May and June 1945.

Production

  • Prototypes: 3
  • Kawasaki Ki-100-Ia, Army type 5 Fighter Model 1A: 272
    • The Imperial Japanese Army Air Force ordered 272 Ki-100-Ia conversions. Deliveries began in March 1945.
  • Kawasaki Ki-100-Ib: 99, 106, 118
    • Entered production in May 1945.
  • Kawasaki Ki-100-II: 2, 3
  • Total: 396
    • Manufacturer: Kawasaki Kokuki Kogyo K.K.
    • Production: February - August 1945
    • 275 prototypes and Ki-100-Ias converted from Ki-61-II airframes.

Variants

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

Usage

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

Highly Successful

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

Specifications

  Kawasaki Ki-100
Type Fighter
Crew 1
Engine (Type) Mitsubishi Ha-112-II
Cylinders Radial 14
Cooling  
Net HP 1,500
Propeller blades 3
Dimensions  
Span 39' 4.5"
12 m
Length 28' 11.25"
8.82 m
Height 12' 3.5"
3.75 m
Wing area  
Weight  
Empty  
Loaded  
Performance  
Speed  
Cruising speed  
Climb  
Service ceiling  
Range  
Range with drop tanks  
Armament  
Nose 2: 20 mm
Wings 2: 12.7 mm MG
Bombs - under wings 2: 551 lb
2: 250 kg
  Kawasaki Ki-100-I
Type  
Crew  
Engine (Type)  
Cylinders  
Cooling  
Net HP  
Propeller blades  
Dimensions  
Span  
Length  
Height  
Wing area  
Weight  
Empty 5,567 lb
2,525 kg
Loaded 7,705 lb
3,495 kg
Performance  
Speed @ 19,685' /
6,000 m
360 mph
579 kph
Speed @ 32,810' /
10,000 m
332 mph
534 kph
Cruising speed 248 mph
400 kph
Climb 3,280'/minute
1,000 m/minute
Climb to 16,405' /
5,000 m
20 minutes
Service ceiling 36,090'
11,000 m
Range 870 miles
1,400 km
Range with drop tanks 1,367 miles
2,200 km
Armament  
  Kawasaki Ki-100-Ia/b
Type Fighter
Crew 1
Engine (Type) Mitsubishi Ha-112-II
Cylinders Radial 14
Cooling  
Net HP 1,500
Propeller blades  
Dimensions  
Span 39' 4.4"
12 m
Length 28' 10.5"
8.8 m
Height 12' 3.6"
3.75 m
Wing area 215.3 ft2
20 m2
Weight  
Empty 5,952 lb
2,700 kg
Loaded 8,091 lb
3,670 kg
Performance  
Speed @ 32,810' /
10,000 m
367 mph
590 kph
Cruising speed 217 mph
350 kph
Climb  
Climb to 32,810' /
10,000 m
20 minutes
Service ceiling 35,007'
10,670 m
Range 1,243 miles
2,000 km
Range with drop tanks  
Armament  
Nose 2: 12.7 mm Ho-103 Type I MG
Wings 2: 20 mm Ho-5
Bombs 2: 551 lb
2: 250 kg
  Kawasaki Ki-100-II
Type Fighter
Crew 1
Engine (Type) Mitsubishi Ha-112-II Ru
Cylinders Radial 14
Cooling Air
Net HP 1,500
Propeller blades  
Dimensions  
Span 39' 4"
Length 28' 11"
Height 12' 3"
Wing area  
Weight  
Empty  
Loaded 8,091 lb
Performance  
Speed @ 19,685' /
6,000 m
454 mph
Cruising speed  
Climb  
Service ceiling 36,090'
Range 1,118 miles
Range with drop tanks  
Armament 2: MG
2: 20 mm
Bombs 1,100 lb

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