|Status||out of service|
|Primary users||Imperial Japanese Navy|
Japanese Post Office
The first prototype of the Type 90-2 Reconnaissance Seaplane, or E4N1, flew in 1930. This was fitted with twin floats and had no cowling for the engine. This prototype was rejected.
The type was completely redesigned as the Type 90-2-2 or E4N2, with a single main-float and twin, wing-mounted outriggers and introduced a cowled engine. This entered production for the Navy in 1931.
A landplane version of the Type 90-2-2 was developed as the E4N2-C with a tailwheel undercarriage
The E4N2 was employed as a shipboard spotter aircraft launched by catapult.
In 1933, nine E4N2-C airframes were converted to P1 mail planes. Single-seat landplanes with an enclosed cockpit, these were employed on night-mail services between the Japanese Home Islands.
(Navy Type 90-2-1 Reconnaissance Seaplane) twin-float seaplane, Nakajima NZ - two prototypes only.
- (Navy Type 90-2-2 Reconnaissance Seaplane) - Nakajima NJ single-float seaplane. 85 built.
- (Navy Type 90-2-3 Carrier Reconnaissance Aircraft) - Nakajima NJ landplane fitted with arresting gear and fixed-undercarriage. 67 built.
- (Navy Type 90-2-3 Reconnaissance Seaplane) Nakajima NJ.
- Nakajima P-1
- single-seat mailplane. 9 converted from E4N2-C airframes.
- Nakajima Giyu-11
- One of the two E4N1 seaplanes converted with a cabin for use by Tokyo Koku Yuso Kaisha between Haneda airport, Shimizu and Shimodadisambiguation needed.
Specifications (Type 90-2-2)
Data from Japanese Aircraft 1910-1941 
- Crew: 2
- Length: 8.87 m (29 ft 1¼ in)
- Wingspan: 10.98 m (36 ft 0 in)
- Height: 3.97 m (13 ft 0 in)
- Wing area: 29.7 m² (319 ft²)
- Empty weight: 1,252 kg (2,760 lb)
- Loaded weight: 1,800 kg (3,968 lb)
- Powerplant: 1 × Nakajima Kotobuki 2 nine-cylinder radial engine, 433 kW (580 hp)
- Maximum speed: 232 km/h (125 kn, 144 mph)
- Cruise speed: 148 km/h (80 kn, 92 mph)
- Range: 1,019 km (550 nmi, 633 mi)
- Service ceiling: 5,740 m (18,830 ft)
- Wing loading: 60.7 kg/m² (12.4 lb/ft²)
- Power/mass: 0.24 kW/kg (0.15 hp/lb)
- Mikesh, Robert C. and Abe, Shorzoe. Japanese Aircraft 1910-1941. London: Putnam Aeronautical Books, 1990. ISBN 0-85177-840-2 Cite error: Invalid
<ref>tag; name "Mikesh" defined multiple times with different content
- Francillon, Réne J. Japanese Aircraft of the Pacific War. London: Putnam & Company Ltd., 1970 (2nd edition 1979). ISBN 0-370-30251-6
- Mikesh, Robert C. and Abe, Shorzoe. Japanese Aircraft 1910-1941. London: Putnam Aeronautical Books, 1990. ISBN 0-85177-840-2
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