×
Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines Military Pay Scale Global Military Ranks
HOME
AVIATION / AEROSPACE
MODERN AIR FORCES
COUNTRIES
MANUFACTURERS
COMPARE
BY CONFLICT
BY TYPE
BY DECADE
SECRET WEAPONS OF THE IJA/IJN
WORLD WAR 2
X-PLANE

Aichi S1A Denko (Bolt of Lightning)


Twin-Engine Night-Fighter Aircraft Proposal


Aviation / Aerospace

1 / 1
Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

The twin-seat, twin-engine Aichi S1A Denko was intended as a successor to the Nakajima J1N1 Gekkou line in the night-fighter role for Japan during World War 2.



Authored By: Staff Writer | Last Edited: 6/21/2018 | Content ©www.MilitaryFactory.com
The Aichi S1A "Denko" was in development with the Empire of Japan during World War 2 (1939-1945) as a successor to the Nakajima J1N1 "Gekkou" - or "Gekko". The Gekko proved itself since its introduction in May of 1941 as a very capable twin-engined heavy fighter. It saw service as a long-ranged reconnaissance platform but, more importantly, as a night fighter fitted with radar and obliquely-angled (30-degrees) 20mm cannons designed to strike at the vulnerable bellies of Allied bombers.

As good as the Gekko was, the arrival of the American Boeing B-29 "Superfortress" from May of 1944 on over Japanese territories across the Pacific Theater began to outclass the early-war Nakajima design - it lacked the high-altitude performance and a more capable radar fit needed to contend with the new threat. As such thought was given to a new twin-engined heavy type with modern qualities and exceptional capabilities and this charge fell to Aichi as other, more prominent, aircraft-builders of the war were tied to other production commitments for the Empire.

The resulting design became the "S1A" carrying a crew of two and outfitted with the required mission equipment for the night-hunter role. Dimensions included an overall length of 15 meters, a wingspan of 17.5 meters, and a height of 4.6 meters. Structurally, the S1A1 was to become Japan's largest fighter of the war. Empty weight was 7,320 kg against a Maximum Take-Off Weight (MTOW) of 11,510 kg. Power was from 2 x Nakajima NK9K-S air-cooled, twin-row 18-cylinder radial piston engines developing 2,000 horsepower each and driving four-bladed propeller units.

The aircraft's general configuration was typical of Japanese heavy fighter entries seen during World War 2 . It utilized a central fuselage containing the crew of two, avionics, fuel stores, and vital mission equipment. The cockpit was seated well-forward of midships and aft of a short nosecone assembly. The nose section held the standard fixed, forward-facing armament. At midships was a framed observation dome seated ahead of a turret emplacement. The tail unit relied on a single vertical fin with low-mounted horizontal planes along the aft fuselage sides. The wing mainplanes were ahead of midships and each held an underslung engine nacelles - the pilot being given unobstructed views of both installations. The mainplanes themselves were straight in their general design with clipped wingtips. The undercarriage was a typical "tail dragger" arrangement.

Performance for the S1A in prototype form included a maximum speed of 360 miles per hour, a cruising speed of 275 miles per hour, a range out to 1,555 miles (ferry), and a service ceiling of 39,370 feet.

Armament centered on 2 x 30mm Type 5 cannons and 2 x Type 99 Model 1 cannons fitted to the nose section for considerable forward-facing firepower. The aforementioned turret emplacement along the fuselage spine fitted 2 x 20mm Type 99 Model 2 cannons offering a trainable weapon's position.

The S1A was a promising design by mid-war standards but its projected weight was beginning to suffer as more and more mission equipment was added. Additionally, the intended Nakajima radials were not presenting the required power that IJN authorities sought so thought was given to fielding S1A1 production models with Mitsubishi engines instead. On December 7th, 1944, there was also a major earthquake off the coast of Japan - the "Tonankai Earthquake" (Magnitude 8.1) - which resulted in the two ordered prototypes being heavily damaged along with their production facilities. Allied bombing raids in June and July of 1945 ended all hope for the aircraft as both prototypes were destroyed and the work was taken up again.

Japan surrendered to the Allies during August of 1945 bringing about a complete end to World War 2.


Specifications



Year:
1946
Status
Cancelled
Crew
2
[ 0 Units ] :
Aichi Kokuki KK - Imperial Japan
National flag of Imperial Japan Imperial Japan (cancelled)
- Fighter
- X-Plane / Developmental
Length:
49.54 ft (15.1 m)
Width:
57.41 ft (17.5 m)
Height:
15.09 ft (4.6 m)
(Showcased structural dimension values pertain to the Aichi S1A Denko (Bolt of Lightning) production model)
Empty Weight:
16,138 lb (7,320 kg)
MTOW:
25,375 lb (11,510 kg)
(Diff: +9,237lb)
(Showcased weight values pertain to the Aichi S1A Denko (Bolt of Lightning) production model)
2 x Nakajima NK9K-S engines developing 2,000 horsepower each.
(Showcased powerplant information pertains to the Aichi S1A Denko (Bolt of Lightning) production model)
Max Speed:
360 mph (580 kph; 313 kts)
Service Ceiling:
39,370 feet (12,000 m; 7.46 miles)
Max Range:
1,553 miles (2,500 km; 1,350 nm)
(Showcased performance values pertain to the Aichi S1A Denko (Bolt of Lightning) production model; Compare this aircraft entry against any other in our database)
PROPOSED:
2 x 30mm Type 5 cannons in fixed, forward-firing mountings on fuselage.
2 x 20mm Type 99 Model 1 cannons in fixed, forward-firing mountings on fuselage.
2 x 20mm Type 99 Model 2 cannons in dorsal-mounted turret.
(Showcased armament details pertain to the Aichi S1A Denko (Bolt of Lightning) production model)
S1A "Denko" - Base Series Designation
S1A-1 - Assumed production model designation; none built.
Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.

Disclaimer | Privacy Policy | Cookies


The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world and WDMMA.org, the World Directory of Modern Military Aircraft.


Facebook Logo YouTube Logo

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-