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Japan's Imperial Army flag

Japan's Kawasaki Ki-102 fighter; Army Type 4 Assault Plane
Allied code name: Randy

Design

The Ki-45 was to be replaced by the Ki-102. The designer of the Ki-102 was Takeo Doi. To save time it was decided to use the Ki-96 as a bases for the Ki-102.

Tail wheel was retractable.

Each crew member was in their own enclosed cockpits.

High Altitude Modifications

Six of the pre-production aircraft were modified to be high altitude fighters. The crew area was modified and Mitsubishi Ha-112-IIru engines were installed. Only 15 were eventually delivered because of difficulties with the turbo chargers.

Prototype

The Ki-102 prototype first flew in March 1944. Testing showed that the tail wheel strut needed to be taller as the Ki-102 was directionally unstable on the ground.

Production

In October 1944 the Ki-102 was ordered into production.

  • Prototypes: 3
    • Production: February - March 1944
  • Pre-Production: 20
    • Production: April - October 1944
  • Prototypes and pre production: 23
  • Kawasaki Ki-102a: 26 (6 conversions of pre-production aircraft)
    • Production / Conversions: June 1944 - March 1945
  • Kawasaki Ki-102b: 215
    • Production: October 1944 - July 1945
    • Deliveries began in late 1944.
  • Total: 238, 241
    • Manufacturer: Kawasaki Kokuki Kogyo K.K.
  • Conversions:
    • Kawasaki Ki-102a: 6, 26
      • First flew in June 1944.
    • Kawasaki Ki-102c: 2
      • Conversion: July - August 1945
      • First flew in July 1945.

Variants

  • Kawasaki Ki-102a: Heavy fighter. High altitude fighter. Had Ru-102 superchargers. Fifteen delivered to Army.
  • Kawasaki Ki-102b, Army Type 4 Assault Plane: Ground attack.
  • Kawasaki Ki-102c: Night fighter. Engine had superchargers for high altitude flight. Could carry a 57 mm cannon. Fuselage was lengthened and wing area increased to facilitate night landings. The radar was in a plexiglas's dome above the fuselage. Never saw combat as war ended.
  • Special Fighter 2: Was to have two Mitsubishi Ha-104 (1,900 HP) engines that would provide greater speed but sacrifice flight time. Only on drawing board.

Usage

Many of the Ki-102s were stationed in Japan to protect the home islands.

Units

  • Sentais: 28th, 45th
  • 27th Kokuritsu Dai Shijugo Chutai

Air-to-Ground Missile

The Ki-102b was used in the Igo-1-B air-to-ground guided missile tests.

Okinawa

Some of the Ki-102s were used over Okinawa.

Specifications

  Kawasaki Ki-102
Type Heavy fighter
Ground attack
Crew 2
Engine (Type) 2: Mitsubishi Ha-112-II
Cylinders Radial 14
Cooling Air
Net HP 1,500 each
Armament  
Nose 1: 57 mm Ho-401
Fuselage 2: 20 mm Ho-5
Rear Cockpit 1: 12.7 mm Ho-103
  Kawasaki Ki-102a
Type Fighter, High altitude fighter
Crew 2
Pilot, radio operator
Engine (Type) 2: Mitsubishi Ha-112-II Ru
Cylinders Radial 14
Cooling Air
Net HP 1,500 each
Propeller blades 3 each, 3 metal constant speed
Dimensions  
Span 51' 1"
15.57 m
Length 37' 6.75", 37' 7"
11.45 m
Height 12' 1.75", 12' 2"
3.7 m
Weight  
Loaded 16,094 lb
Performance  
Speed at 19,685' / 6,000 m 360 mph
Service ceiling 32,810'
Range 1,243 miles
Armament 1: MG
Nose 1: 37 mm Ho-203
1: 57 mm
Forward belly 1: 20 mm
2: 20 mm, 20 mm Ho-5
Drop Tanks 2: 44 gallons
2: 200 liter
  Kawasaki Ki-102b
Type Ground attack
Crew 2
Pilot, radio operator
Engine (Type) 2: Mitsubishi Ha-112-II
OR 2: Mitsubishi Ha-33 62
Cylinders Radial, Radial 14
Cooling Air
Net HP 1,500 each
Propeller blades 3 each, 3 metal constant speed
Dimensions  
Span 51' 1"
15.57 m
Length 37' 6.75", 37' 6.78125", 37' 6.8"
11.45 m
Height 12' 1.65625", 12' 1.7", 12' 1.75"
3.7 m
Wing area 365.972 sq ft, 365.98 sq ft
34 sq m
Weight  
Empty 10,913 lb
4,950 kg
Loaded 16,094 lb
7,300 kg
Performance  
Speed at 19,685' / 6,000 m 360 mph
579 kph, 580 kph
Climb to 16,405' / 5,000 m 6.9 minutes, 6 minutes 54 seconds
Service ceiling 32,810', 36,090'
10,000 m, 11,000 m
Range 1,243 miles
2,000 km
Armament  
Nose 1: 57 mm , 57 mm Ho-401
Forward Fuselage 1: 20 mm
2: 20 mm Ho-5
Rear cockpit 1: 12.7 mm MG, 12.7 mm Type 1 Ho-103
Bombs 2: 551 lb
2: 250 kg
OR  
Drop Tanks 2: 44 gallons
2: 200 liter
  Kawasaki Ki-102c
Type Night fighter
Crew 2
Pilot, radar operator
Engine (Type) 2: Mitsubishi Ha-112-II Ru
Cylinders Radial 14
Cooling Air
Net HP 1,500 each
Propeller blades 3 each, 3 metal constant speed
Dimensions  
Span 56' 7", 56' 7.125"
17.25 m
Length 42' 9.75", 42' 9.78125"
13.05 m
Height 12' 1.65625"
3.7 m
Wing area 430.555 sq ft
40 sq m
Weight  
Empty 11,464 lb
5,200 kg
Loaded 16,755 lb
7,600 kg
Performance  
Speed at 32,810' / 10,000 m 373 mph
600 kph
Climb to 32,810' / 10,000 m 18 minutes
Service ceiling 44,290'
13,500
Range 1,367 miles
2,200 km
Armament  
Forward Fuselage 2: 30 mm, 30 mm Ho-105
Upward firing in fuselage 2: 20 mm, 20 mm Ho-5
Drop Tanks 2: 44 gallons
2: 200 liter

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
  4. Japanese Aircraft of the Pacific War, René J Francillon, 1970
20th Century American Military History Crucial Site