Nakajima NY / A2N / Type 90
After importation in 1928 of a Boeing 69-B (F2B-1) by the Imperial Navy, and, in the following year, the fourth Boeing 100 (essentially similar to the F4B-l), the two aircraft were shown to industry as examples of the then-current US shipboard fighter technology. Nakajima, which had previously built the Gloster Gambet (A1N1-2) for the Imperial Navy, initiated development of a carrier fighter based broadly on the Boeing designs as a private venture. Responsibility for the fighter was assigned to Takao Yoshida and two prototypes powered by the Jupiter VI engine were completed in December 1929 and the NY prototype first flew in 1930.
It was an unequal-span single-seat fighter of biplane configuration, with divided fixed landing gear which had spatted wheel fairings discarded in later production aircraft. The A2N1 and A2N2 had lower wing dihedral only, whereas the A2N3 had dihedral on both wings. The twin-gun armament was installed in blast troughs on the lower sides of the fuselage in the A2N1, while later versions had them installed in the forward decking.
Evaluated by the Navy in the following year, these prototypes were rejected as they were considered to offer an insufficient improvement over the A1N1. Some redesign was undertaken by Jingo Kurihara, and, with a 580 hp Kotobuki 2 engine, a further prototype was completed in May 1931, the type being adopted by the Navy in April 1932 as the A2N1 (Type 90). With a fabric-covered metal fuselage and a similarly skinned wing of mixed construction, the A2N1 carried an armament of two 7,7-mm machine guns. The principal production version was the A2N2 (Type 90-II) with re-arranged fuel tankage and armament, the A2N3 (Type 90-III) differing in having five degree of dihedral on the upper wing main panels. Series production was undertaken from 1932 until 1936 by both the parent company and Sasebo.
Production totalled 106, built between 1930 and 1935, and later 66 examples of the A3N1 two-seat training variant appeared, most being conversions of the single-seater. A2Ns from the carrier Kaga (2nd Carrier Division) flew on operations in the Shanghai area during the 1937 Sino-Japanese Incident.
Engine: Nakajima Kotobuki 2, 580 hp / 433kW
Span: 30 ft 8.9 in (9,37 m).
Length: 20 ft 3.4 in (6,18 m).
Height: 9 ft 11 in (3,02 m).
Wing area: 212.49 sq ft (19,74 sq.m).
Empty weight: 2,304 lb (1 045 kg)
Loaded weight: 3,417 lb (1 550 kg).
Max speed: 182 mph (293 kph) at 9,845 ft (3000 m)
Endurance: 3 hrs.
Time to 9,845ft (3000m): 5.75 min.
Ceiling: 9000 m / 29550 ft
Range: 500 km / 311 miles
Armament: two 7,7-mm mg.