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Nakajima NZ / NJ / E4N / P-1 Mail / Giyu-11



Nakajima's first attempt to satisfy the Navy requirement was the E4N1 biplane. This aircraft had a welded chromium molybdenum steel tube structure with fabric covering at the rear and aluminium sheet covering at the front. It was a standard biplane, with fabric covered wings with a wooden structure. The E4N1 was a twin float aircraft, but the two floats were very similar to the Vought design. Bombs were carried on the underside of the fuselage. It was powered by a 420-520hp Nakajima Jupiter VI radial engine, and reached 130mph.
The first prototype Type 90-2 Reconnaissance Seaplane, or E4N1, equal-span biplane reconnaissance aircraft first flew in 1930, company designation NZ. Intended for navy service as the Nakajima E4N1, it had twin floats and an uncowled Kotobuki radial engine.
Two prototypes of the E4N1 were built. They were given the official designation Navy Type 90-2-1 Reconnaissance Seaplane - Aichi had already had a reconnaissance seaplane accepted in 1930, and that became the Type 90-1. The E4N1 was tested by the Japanese Navy early in 1931, but the design was rejected because it wasn't very manoeuvrable.
A stronger version was produced and in December 1941 was accepted as the Type 90-2-2 Reconnaissance Seaplane, E4N2. It could also be used with wheels, when it became the Type 90-2-3 E4N3.
The NJ or Navy Type 90-2-2 or E4N2, Reconnaissance Floatplane was a complete redesign, with a single main float and twin wingtip stabilising floatsand introduced a cowled engine. It closely resembles the US Vought O3U-1 Corsair biplane and, like it, was intended for shipboard use and catapult launching. This time the fuselage structure was a mix of wood and metal. Once again the forward fuselage was metal covered but the rest of the fuselage and the wings were fabric covered. The wings had a wooden structure and were rearward folding.
The E4N2 was much more manoeuvrable than the E4N1. The first prototype was tested late in 1930, suggesting that it was already under development before the E4N1 had been rejected.
Powered by a 336kW Nakajima Kotobuki radial engine, the Type 90-2-2 had a maximum speed of 222km/h and 85 went into service with the Japanese navy as the E4N2 between 1931 and 1933, a version with fixed wheel landing gear going into service as the E4N2-C; 67 of the latter were completed.
Nakajima produced eighty E4N2s between 1931 and 1936 and Kawanishi produced another 67 aircraft between 1932 and 1934.
Nakajima also produced five of the E4N2-C carrier variant. This had wheels and carrier arrestor gear. They underwent service trials but weren't accepted.
In total 153 were built.
In 1933 nine of the E4N2-C landplanes were converted as night mail carriers designated P-1 Mail, for use between the main islands of Japan. A single-seater with the pilot accommodated in an enclosed cockpit.
The E4N2 was the Japanese Navy's main ship-borne reconnaissance aircraft from 1932 until it was replaced by the Nakajima Type 95 Reconnaissance Seaplane (E8N) in the mid 1930s. It was used on battleships and cruisers and was a popular aircraft with a good combination of manoeuvrability and strength. It saw combat during the Shanghai Incident
E4N1 / Navy Type 90-2-1 / NZ
two prototypes
twin-float seaplane
Engine: Nakajima Jupiter VI, 420-520hp
Speed: 130mph
E4N2 / Type 90-2-2 / NJ
Engine: 1 x Nakajima "Kotobuki", 433 kW (580 hp)
Wingspan: 10.98 m (36 ft 0 in)
Wing area: 29.7 m² (319 ft²)
Length: 8.87 m (29 ft 1¼ in)
Height: 3.97 m (13 ft 0 in)
Empty weight: 1,252 kg (2,760 lb)
Loaded weight: 1,800 kg (3,968 lb)
Max speed: 222 km/h / 138 mph
Cruise speed: 148 km/h (80 kn, 92 mph)
Range: 1,019 km (550 nmi, 633 mi)
Climb Rate: 10 min 34 sec to 9,843ft
Service ceiling: 5,740 m (18,830 ft)
Crew: 2
Armament: 1 × fixed 7.7 mm machine gun & 1 × flexible 7.7 mm machine gun
Bombload: 2 × 30 kg (66 lb) bombs
single-float seaplane
85 built
E4N2-C / Navy Type 90-2-3 / NJ
arresting gear and fixed-undercarriage
67 built
E4N3 / Navy Type 90-2-3 / NJ
Reconnaissance Seaplane
P-1 Mail
single-seat mailplane
9 converted from E4N2-C airframes
One of the two E4N1 seaplanes converted with a cabin for use by Tokyo Koku Yuso Kaisha between Haneda airport, Shimizu and Shimoda.



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