Yokosuka K4Y

https://en.wikipedia.org/wiki/Yokosuka_K4Y

The Yokosuka K4Y (or Navy Type 90 Seaplane Trainer) was a Japanese floatplane
trainer of the 1930s. A single engined two-seat biplane, 211 K4Ys were built
between 1933 and 1940, serving as the Imperial Japanese Navy's basic floatplane
trainer throughout the Second World War.

In 1930, the Imperial Japanese Navy Air Service's basic seaplane trainer was the
Yokosuka K1Y or Type 13 Seaplane Trainer, which had been in use from 1925, and
it instructed the First Naval Air Technical Arsenal based at Yokosuka to design
a replacement. The design team, led by Jiro Saha and Tamefumi Suzuki designed a
single-bay biplane with a welded steel-tube fuselage and wooden wings, it being
the first Japanese designed aircraft with such a fuselage.

Yokosuka built two prototypes, powered by 90 hp (67 kW) Hatakaze four-cylinder
air-cooled inline engines in 1930, flying in 1930, and after successful testing,
a version powered by a 130 hp Gasuden Jimpu radial engine was ordered into
production as the Navy Type 90 Seaplane trainer, with the short designation
K4Y1.

Role
Floatplane trainer

National origin
Japan

Manufacturer
Yokosuka Naval Air Technical Arsenal

First flight
1930

Introduction
1933

Primary user
Imperial Japanese Navy Air Service

Number built
211

Production began at Watanabe in May 1933, Watanabe building 156 by 1939, with
production then transferring to Nippon Hikoki who built a further 53 in 1939–40.

The K4Y1 started to replace the K1Y from 1933, remaining the Imperial Japanese
Navy Air Service's principal basic seaplane trainer throughout the Pacific war.
A few aircraft were released for civilian use.

Specifications (K4Y1 seaplane)

General characteristics
Crew: 2
Length: 9.05 m (29 ft 8 in)
Wingspan: 10.90 m (35 ft 9 in)
Height: 3.51 m (11 ft 6 in)
Wing area: 29.5 m2 (318 sq ft)
Empty weight: 740 kg (1,631 lb)
Gross weight: 990 kg (2,183 lb)
Powerplant: 1 × Gasuden Jimpu 2 seven-cylinder air-cooled radial engine, 96 kW
(129 hp)
Propellers: single blade

Performance
Maximum speed: 163 km/h; 88 kn (101 mph) at sea level
Cruise speed: 93 km/h; 50 kn (57.5 mph)
Range: 315 km; 170 nmi (196 mi)
Endurance: 3½ hours
Service ceiling: 3,460 m (11,350 ft)
Time to altitude: 3,000 m (9,843 ft) in 29 min 20 sec
Wing loading: 33.5 kg/m2 (6.9 lb/sq ft)
Power/mass: 7.6 kg/hp; 16.7 lb/hp




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