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Tachikawa Ki-74 (Pat / Patsy)


Long-Range Reconnaissance Bomber


Imperial Japan | 1944



"The end of World War 2 in 1945 signaled the end of the Tachikawa Ki-74 long-range reconnaissance bomber project for Japan."



Authored By: Staff Writer | Last Edited: 02/08/2018 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
In the realm of World War 2 Japanese Empire aviation, Tachikawa certainly does not carry the same weight as do names such as Mitsubishi and Nakajima. However, the company was responsible for a family of aircraft using the "Ki" designator that dated back to the two-seat biplane trainer "Ki-9" of 1935. During the war years the company also lent its expertise in the design, development, and production of other aircraft including its own "Ki-74", a long-range reconnaissance bomber of the war and appeared in just sixteen examples.

For this product, Tachikawa engineers elected for a twin engine layout, consistent with other high-speed platforms of the period - namely the famous British de Havilland DH.98 "Mosquito". These powerplants would be fitted into streamlined nacelles located along the lead edges of each monoplane wing. To squeeze every bit of speed out of the airframe, a well-streamlined fuselage was designed. The tail unit utilized a conventional single-finned layout with low-set horizontal planes. The undercarriage was of the "tail-dragger" configuration with two single-wheeled main legs (under the engine nacelles) and a diminutive tailwheel at rear.

Developed of the Ki-74 was primarily for the Imperial Japanese Army Air Force (IJAAF), the air arm of its massive land army. The long-range reconnaissance /bomber role was an ongoing requirement of the military as its many conquests across Asia and the Pacific would require a long endurance thoroughbred. As such, the aircraft was in the design stage as soon as 1939 but other military commitments by both the IJAAF and Tachikawa ensured that a first flight was not made until March of 1944.

The original prototype was outfitted with Mitsubishi Ha-211-I radial piston engines of 2,200 horsepower output but this switched to Ha-211 radials that were turbosupercharged in the following pair of prototypes. After technical issues prevented their long-term adoption, the Mitsubishi Ha-104 Ru, a turbosupercharged 18-cylinder air-cooled radial of 2,000 horsepower output, was selected instead (driving four-blade propeller units). This engine outfitted the next thirteen airframes that were to serve in the preproduction role ahead of finalized production models.

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As built, the Ki-74 carried a crew of five personnel throughout its deep fuselage. it displayed a length of 58 feet, a wingspan of 61 feet, and a height of 16.8 feet. Empty weight was listed at 22,490lb with a gross weight nearing 42,770lb. Power from the Ha-104 radials provided a maximum speed of 355 miles per hour with a cruising speed in the 250-mile range. The aircraft's service ceiling reached 39,370 feet and range was out to 4,970 miles.

As a high performance, high speed mount, the aircraft was modestly armed with a sole 12.7mm Ho-103 heavy machine gun - its best defense was outrunning any ground-based fire or incoming interceptor. It was also designed to carry a bombload up to 2,200lb to fulfill its secondary bomber role.

Despite the work put into the Ki-74 product, it never materialized beyond the aforementioned sixteen prototypes and preproduction aircraft. The war situation in Japan grew to the point that only emergency programs were furthered and war materials rationed to the extreme. The Ki-74 entered into the final stages of its development when the war with ended the Japanese surrender in August of 1945 - leaving the aircraft to not see any operational service in the conflict and a rather low-profile history overall.

When word of the Ki-74's development had reached Allied ears, it was assigned the nickname of "Pat", authorities believing it to be a high speed fighter type. However, as more information became available and the true role of reconnaissance / bomber came to light, the name was revised to "Patsy". None of the airframes survive today.

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Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the Tachikawa Ki-74 (Pat / Patsy) Long-Range Reconnaissance Bomber.
2 x Mitsubishi Ha-104 Ru turbosupercharged 18-cylinder air-cooled radial piston engines developing 2,000 horsepower each.
Propulsion
354 mph
570 kph | 308 kts
Max Speed
39,370 ft
12,000 m | 7 miles
Service Ceiling
4,971 miles
8,000 km | 4,320 nm
Operational Range
City-to-City Ranges
Operational range when compared to distances between major cities (in KM).
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the Tachikawa Ki-74 (Pat / Patsy) Long-Range Reconnaissance Bomber.
5
(MANNED)
Crew
57.9 ft
17.65 m
O/A Length
61.0 ft
(18.60 m)
O/A Width
16.7 ft
(5.10 m)
O/A Height
22,487 lb
(10,200 kg)
Empty Weight
42,770 lb
(19,400 kg)
MTOW
Design Balance
The three qualities reflected below are altitude, speed, and range. The more full the box, the more balanced the design.
RANGE
ALT
SPEED
Armament
Available supported armament and special-mission equipment featured in the design of the Tachikawa Ki-74 (Pat / Patsy) Long-Range Reconnaissance Bomber .
STANDARD:
1 x 12.7mm Ho-103 heavy machine gun

OPTIONAL:
up to 2,200lb of conventional drop bombs.
Variants
Notable series variants as part of the Tachikawa Ki-74 (Pat / Patsy) family line.
Ki-74 - Base Series Deisgnation; sixteen aircraft completed in all.
Operators
Global customers who have evaluated and/or operated the Tachikawa Ki-74 (Pat / Patsy). Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 16 Units

Contractor(s): Tachikawa Aircraft Company Ltd - Imperial Japan
National flag of modern Japan

[ Imperial Japan ]
Relative Max Speed
Hi: 400mph
Lo: 200mph
Aircraft Max Listed Speed (354mph).

Graph Average of 300 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
Production Comparison
16
36183
44000
Entry compared against Ilyushin IL-2 (military) and Cessna 172 (civilian) total production.
MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030
Aviation Timeline
EarlyYrs
WWI
Interwar
WWII
ColdWar
Postwar
Modern
Future
1 / 1
Image of the Tachikawa Ki-74 (Pat / Patsy)
Image from the Public Domain.

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
GROUND ATTACK
RECONNAISSANCE
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The Tachikawa Ki-74 (Pat / Patsy) Long-Range Reconnaissance Bomber appears in the following collections:
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