Nakajima E4N2

The E4N2 (also known as the Type 90-2-2 Reconnaissance Seaplane) was employed by the IJN during the early 1930s as a shipboard reconnaissance aircraft. These floatplanes were launched by catapult and recovered after landing. It was replaced in service by the Nakajima E8N. A total of 153 planes were built from 1931 to 1933.

The E4N2 has a crew of two: pilot and observer. Each crew has access to a single 7.7mm LMG. The plane carries two 66-lb. bombs. The E4N2 burns 16.8 gallons of fuel per hour. A full load of fuel and ammo (excluding bombs) costs $19.


Subassemblies: Recon Fighter chassis +2; Light Fighter wings with Biplane option +2; 1 fixed Skid +0; one Large Weapon Waterproofed pontoon [Body:U] +2; two Small Weapon Waterproofed pontoons [Wings:U] +0.

Powertrain: 336-kW Aerial HP gasoline engine with 336-kW Old prop; 45-gallon standard fuel tank; 4,000-kW battery.

Occ.: 2 CS Body

Cargo: 0 Body


Armor F RL B T U

Body: 1/2C 1/2C 1/2C 1/2C 1/2C

Wings: 1/2C 1/2C 1/2C 1/2C 1/2C

Pontoons: 2/2 2/2 2/2 2/2 2/2



2xAircraft LMG/7.7mm LMG [Body:F,B] (500 rounds each).



Body: Navigation instruments, medium range radio transmitter, casemate mount. Wings: one 66-lb. hardpoint each.



Size: 29'x36'x13' Payload: 0.6 tons Lwt.: 1.98 tons

Volume: 96 Maint.: 71 hours Cost: $7,898

HT: 6. HPs: 15 Body, 68 each Wing, 6 Skid, 120 central Pontoon, 45 each wing Pontoon.

aSpeed: 144 aAccel: 4 aDecel: 12 aMR: 3 aSR: 1

Stall Speed: 49 mph. Take Off Run: 600 yards. Catapult Launch: 167 yards. Landing Run: 533 yards.

wSpeed: 38 wAccel: 4 wDecel: 2.5 (4.5) wMR: 0.25 wSR: 1

Draft: 1.3 feet. Flotation Rating: 7,265 lbs.


Design Notes:

Historical wing area was 319 sf. Wing weight, cost and HPs were halved to reduce design weight. Design loaded weight was 3,861 lbs.; this was increased 3% to the historical. Design aSpeed without loaded hardpoints was 143 mph; this is reduced to 141 mph with loaded hardpoints. Historical aSpeed is shown; -1 mph to aSpeed per loaded hardpoint. MG load-outs and fuel capacity are a guess. Historical loaded weight and wing area were used for all performance calculations. Takeoff and landing runs are from the water; catapult takeoff distance was calculated from design gAccel.



The E4N1 (1930) featured twin floats and no engine cowling. Only one prototype was built.

The E4N2-C was a landplane version with fixed landing gear. 67 built.

The P1 (1933) was a conversion of nine E4N2-Cs for mail cartage. They featured an enclosed cockpit.


From the Aerodrome for GURPS

2008 by Jim Antonicic