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Japan's Imperial Army flag

Japan's Tachikawa Ki-74 long range bomber
Allied Code Names: Pat, Patsy

Photos

  • Tachikawa Ki-74 long range bomber

 

Design

The Koku Hombu put out a requirement, in 1939, for a long range reconnaissance bomber that could operate from bases in Manchuria. It was to meet these specifications:

  • Range: 3,107 miles / 5,000 km
  • Cruising Speed: 280 mph / 450 km

To meet these specifications the designer, Dr. Kimura, proposed using a pressurized cabin. As this was still under development the Ki-74 project had to wait.

In late 1941 the aircraft was to be able to bomb the United States mainland. Self sealing fuel tanks and armor was added to the design.

Armament

The only defensive armament was in the tail and it was a remotely controlled 12.7 mm Ho-103 machine gun.

Construction

The Ki-74 was of all metal construction.

Code Name

Initially the Allies thought the Ki-74 was a high speed fighter and gave it a code name of Pat. When it was found that the Ki-74 was really a bomber it was changed to Patsy.

Prototypes

In September 1942 the Koku Hombu ordered three prototypes.

The first prototype was completed in March 1944. Two additional prototypes followed.

During test flights it was found that the Mitsubishi Ha-211-I Ru (2,200 HP) engines were problematic and replaced by the Mitsubishi Ha-104 Ru.

Production

  • Tachikawa Ki-74 prototypes: 3
  • Tachikawa Ki-74 pre-production: 13
  • Manufacturer: Tachikawa Hikoki K.K. at Tachikawa
  • Production: March 1944 - August 1945

Variants

  • Tachikawa Ki-74:
  • Tachikawa Ki-74-II: Was to have a bomb load of 4,410 lb / 2,000 kg
  • Tachikawa Ki-74?: Transport.

Usage

Fly to Germany

The forth pre-production Ki-74 completed was modified in 1944 to make a non-stop flight to Germany but the war in Europe ended before it could happen.

Bomb Saipan

There was a plan to bomb American bases on Saipan with Ki-74s but the war ended before it could be carried out.

Specifications

  Ki-74 1st Prototype
Type High Altitude Long Range Reconnaissance Bomber
Crew 5
Engine (Type) 2: Mitsubishi Ha-211-I
Cylinders Radial 18
Cooling Air
Net HP 2,200 each
Propeller blades 4 metal
  Ki-74 2nd - 3rd Prototypes
Type High Altitude Long Range Reconnaissance Bomber
Crew 5
Engine (Type) 2: Mitsubishi Ha-211-I Ru
Cylinders Radial 18
Cooling Air
Net HP 2,200 each
Propeller blades 4 metal
  Ki-74 Pre-Production
Type High Altitude Long Range Reconnaissance Bomber
Crew 5
Engine (Type) 2: Mitsubishi Ha-104 Ru
Cylinders Radial 18
Cooling Air
Net HP 2,000 each
Propeller blades 4 Metal
Dimensions  
Span 88' 7"
27 m
Length 57' 10 7/8"
17.65 m
Height 16' 8 25/32"
5.1 m
Wing area 861.11 sq ft
80 sq m
Weight  
Empty 22,487 lb
10,200 kg
Loaded 42,770 lb
19,400 kg
Performance  
Speed at 27,890' / 8,500 m 354 mph
570 kph
Speed - Cruising at 26,245' / 8,000 m 249 mph
400 kph
Climb to 26,245' / 8,000 m 17 minutes
Service ceiling 39,370'
12,000 m
Range 4,971 miles
8,000 km
Armament  
Tail 1: 12.7 mm Ho-103 Type 1
Bombs 2,205 lb
1,000 kg

Sources:

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