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Nakajima AT27

Single-Seat, Twin-Engine Fighter Concept [ 1942 ]

Lacking credible intel at the start of World War 2, American authorities thought the Nakajima AT27 to be a real in-service fighter for Japan.

Authored By: Staff Writer | Last Edited: 09/14/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

The Nakajima AT27 was a pure concept fighter aircraft originating in the early part of World War 2 (1941-1945). The aircraft was spotted in a Japanese publication (of April 1941) under the article heading "Dreams of Future Designers" and appeared as a streamlined single-seat, twin-engine design of extremely slim profile - making for both a low-drag product and a small target at range. The design was later covered in the American publication "Flight" (of December 1941) which led American intelligence - which lacked credible sources on Japanese air power at the start of the war - to assume the AT27 was a very real fighter/interceptor now in service with the Imperial Japanese air branches. As such, and in keeping with other Japanese aircraft of the period, the Americans assigned it a nickname - in this case "Gus".

Beyond its super-slim appearance, one of the more interesting design qualities of the AT27 was in its planned propulsion scheme: power was to stem from 2 x Vee-type 12-cylinder, liquid-cooled engines developing 1,250 horsepower each, for a grand output total of 2,500 horsepower, to drive a pair of three-bladed propeller units centered at the nose. The blades would spin in contra-rotating fashion, generating considerable pull ability, giving the AT27 exceptional straight-line performance. Estimated maximum speed was to reach 410 miles-per-hour while range would have topped at 1,250 miles. Compared to contemporaries, it can assumed that the AT27's service ceiling would have teased near 40,000 feet - requiring some sort of cockpit pressurization and oxygen supply for operating at such altitudes.

The AT27 exuded sleek styling and clean lines, keeping aerodynamic efficiency at the forefront of its design. The single-seat cockpit was positioned slightly ahead of midships under a low-profile, framed canopy. The pilot's placement was bookended by the engine pairing, one fore with the other aft, and shafts were used to drive the propeller units at the nose. Tapering aft, the fuselage grew evermore slim until terminating at the conventional, single-finned tail unit. A tail-dragger undercarriage, though not detailed, is assumed for the aircraft. The low-mounted mainplanes were to be set ahead of midships and were drawn up as straight appendages with rounded tips and tapering edges. Operating weights were estimated with an empty rating of 8,000lb and a loaded weight near 11,600lb. No structural dimensions were given.

While armament was unknown, the AT27 would most likely have fallen in line with other fighter-interceptors of the mid-war period: perhaps 4 x 20mm automatic cannons or a mix of 2 x 20mm automatic cannons and 12.7mm Heavy Machine Guns (HMGs) - installed within the cowling and/or wing mainplanes.

It was only later that American intelligence realized their mistake in believing the AT27 was a real design, as the Japanese shown their hand with each passing month, and the Gus name fell from intelligence reports for the duration of the war- leaving the AT27 as nothing more than a fantasy IJA/IJN design.©MilitaryFactory.com
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Service Year

Imperial Japan national flag graphic
Imperial Japan

Development Ended.


National flag of modern Japan Imperial Japan
(OPERATORS list includes past, present, and future operators when applicable)
Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
Ability to intercept inbound aerial threats by way of high-performance, typically speed and rate-of-climb.
X-Plane (Developmental, Prototype, Technology Demonstrator)
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.

36.1 ft
(11.00 m)
44.3 ft
(13.50 m)
13.1 ft
(4.00 m)
Empty Wgt
8,003 lb
(3,630 kg)
11,607 lb
(5,265 kg)
Wgt Diff
+3,605 lb
(+1,635 kg)
(Showcased structural values pertain to the base Nakajima AT27 production variant)
Installed: 2 x Vee-type 12-cylinder, liquid-cooled inline piston engines developing 1,250 horsepower each driving 2 x Three-bladed propeller units at the nose in contra-rotating fashion.
Max Speed
410 mph
(660 kph | 356 kts)
39,370 ft
(12,000 m | 7 mi)
1,252 mi
(2,015 km | 3,732 nm)
2,500 ft/min
(762 m/min)

♦ MACH Regime (Sonic)
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030

(Showcased performance specifications pertain to the base Nakajima AT27 production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)
4 x 20mm Ho-5 automatic cannons

2 x 20mm Ho-5 automatic cannons.
2 x 12.7mm Ho-103 Heavy Machine Guns (HMGs).

Supported Types

Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun
Graphical image of an aircraft automatic cannon

(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 0

AT27 "Gus" - Base Design Designation; aircraft appearing in Japanese and American publications only.

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