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Japan's Imperial Navy flag

Japan's Kugisho K5Y, Yokosuka K5Y trainer, Navy Type 93
Allied code name: Willow

Photos

  • Yokosuka K5Y2 trainer floatplane

 

Design

In 1932 the Imperial Japanese Navy asked Kawanishi to develop a new trainer. It was to become the Navy's favorite trainer.

Prototype

The K2Y prototype first flew in December 1933. The K2Y was accepted for use and production started in January 1934.

Production

  • Yokosuka K5Y1 and K5Y2: 2,322
    • Manufacturer:
      • Fuji Hikoki K.K.: 869 (1942 - 1945)
      • Hitachi Kokuki K.K.: 1,393 (1940 - 1944)
      • Kawanishi Kokuki K.K.: 60 (1933 - 1936)
  • Yokosuka K5Y1: 2,553
    • Manufacturer:
      • Dai-Ichi Kaigun Kokusho at Kasumigaura: 75 (1944)
      • Mitsubishi Jukogyo K.K.: 60 (1935 - 1936)
      • K.K. Watanabe Tekkosho: 393 (1936 - 1939)
      • Nippon Hikoki K.K.: 2,025 (1940 - 1945)
  • Yokosuka K5Y2: 869
    • Manufacturer:
      • K.K. Watanabe Tekkosho: 163 (1937 - 1939)
      • Nippon Hikoki K.K.: 706 (1940 - 1945)
  • Yokosuka K5Y3 Prototypes: 2
    • Manufacturer: Nippon Hikoki K.K.
  • Total: 5,770
  • Production: 1933 - 1945
  • Manufacturer: Dai-ichi Kaigun Koku Gijitsusho

Variants

  • Prototype:
  • Yokosuka K5Y, Navy Type 93 Intermediate Trainer:
  • Yokosuka K5Y1: Land based trainer.
  • Yokosuka K5Y2: Seaplane trainer with twin floats.
  • Yokosuka K5Y3: Had floats.
  • Yokosuka K5Y4: Land based. Never manufactured.
  • Yokosuka K5Y5: Land based. Never manufactured.

Usage

Units

  • Kokutais: Kashima, Kasumigaura, Shanghai, Suzuka, Tsuchiura

Specifications

  K5Y
Type Trainer
Crew 2
Pilot, Instructor
Engine (Type) Hitachi Amakaze 11
Cylinders Radial 9
Cooling Air
Net HP 340
Dimensions  
Span 36' 1"
Length 26' 5"
Height 10' 6"
Weight  
Loaded 3,307 lb
Performance  
Speed 132 mph
Service ceiling 18,700'
Range 633 miles
Armament 2: MG
  K5Y1
Type Land Based Trainer
Crew 2
Pilot, Instructor
Engine (Type) Hitachi Amakaze 11
Cylinders Radial 9
Cooling Air
Net HP 340
Propeller blades 2 Wood
Dimensions  
Span 36' 1 1/16"
11 m
Length 26' 4 15/16"
8.05 m
Height 10' 5 21/32"
3.2 m
Wing area 298.159 sq ft
27.7 sq m
Weight  
Empty 2,205 lb
1,000 kg
Loaded 3,307 lb
1,500 kg
Performance  
Speed at Sea Level 132 mph
115 knots
Speed - Cruising at 3,280' / 1,000 m 86 mph
75 knots
Climb to 9,845' / 3,000 m 13 minutes 32 seconds
Service ceiling 18,700'
5,700 m
Range 633 statute miles
550 nautical miles
Armament  
Nose 1: 7.7 mm Type 89
Cockpit - Rear 1: 7.7 mm Type 92
Bombs 2: 66 lb
2: 30 kg
Or 10: 22 lb
10: 10 kg
  K5Y2
Type Twin Float Seaplane Trainer
Crew 2
Pilot, Instructor
Engine (Type) Hitachi Amakaze 11
Cylinders Radial 9
Cooling Air
Net HP 340
Propeller blades 2 Wood
Dimensions  
Span 36' 1 1/16"
11 m
Length 28' 9 21/32"
8.78 m
Height 12' 7/8"
3.68 m
Wing area 298.159 sq ft
27.7 sq m
Weight  
Empty 2,535 lb
1,150 kg
Loaded 3.638 lb
1,650 kg
Performance  
Speed at Sea Level 123 mph
107 knots
Speed - Cruising at 3,280' / 1,000 m 86 mph
75 knots
Climb to 9,845' / 3,000 m 19 minutes 35 seconds
Service ceiling 14,205'
4,330 m
Range 436 statute miles
379 nautical miles
Armament  
Nose 1: 7.7 mm Type 89
Cockpit - Rear 1: 7.7 mm Type 92
Bombs 2: 66 lb
2: 30 kg
Or 10: 22 lb
10: 10 kg
  K5Y3
Type Twin Float Seaplane Trainer
Crew 2
Pilot, Instructor
Engine (Type) Hitachi Amakaze 21
Cylinders Radial 9
Cooling Air
Net HP 515
Propeller blades 2 Wood
Armament  
Nose 1: 7.7 mm Type 89
Cockpit - Rear 1: 7.7 mm Type 92
Bombs 2: 66 lb
2: 30 kg
Or 10: 22 lb
10: 10 kg
  K5Y4
Type Land Based Trainer
Crew 2
Pilot, Instructor
Engine (Type) Hitachi Amakaze 21A
Cylinders Radial 9
Cooling Air
Net HP 480
Propeller blades 2 Wood
Armament  
Nose 1: 7.7 mm Type 89
Cockpit - Rear 1: 7.7 mm Type 92
Bombs 2: 66 lb
2: 30 kg
Or 10: 22 lb
10: 10 kg
  K5Y5
Type Land Based Trainer
Crew 2
Pilot, Instructor
Engine (Type) Hitachi Amakaze 15
Cylinders Radial 9
Cooling Air
Net HP 515
Propeller blades 2 Wood
Armament  
Nose 1: 7.7 mm Type 89
Cockpit - Rear 1: 7.7 mm Type 92
Bombs 2: 66 lb
2: 30 kg
Or 10: 22 lb
10: 10 kg

Sources:

  1. World War II Airplanes Volume 2, Enzo Angelucci, Paolo Matricardi, 1976
  2. Japanese Aircraft of the Pacific War, René J Francillon, 1970
20th Century American Military History Crucial Site