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Yokosuka K1Y

The Yokosuka K1Y, also referred to as the Navy Type 13 Trainer, was a single-engine biplane trainer utilized by the Imperial Japanese Navy during the 1920s and into the 1930s.

The design was created by the Yokosuka Naval Air Technical Arsenal in 1924 as a replacement for the Yokosuka I-go Ko-gata and Avro 504 floatplane trainers.

The aircraft was constructed with fabric-covered wooden materials and featured a Gasuden-built 130 horsepower (97 kW) Benz six-cylinder water cooled inline engine.

The landing gear could be either conventional or floats.

The Navy Type 13 Trainer, with the short system designation E1Y, was accepted into service in October 1925 after its first flight in 1925.

The aircraft was manufactured by several companies, including Nakajima, Kawanishi, Watanabe, and Yokosuka, with a total of approximately 104 units produced.

The Yokosuka K1Y remained the standard floatplane trainer of the Imperial Japanese Navy until it was replaced by the Yokosuka K4Y in 1933, although a few were still in use during the early years of the Second World War.



Version with conventional wheeled undercarriage.

Full designation Navy Type 13 Land Based Trainer.


Version with float undercarriage.

Full designation Navy Type 13 Seaplane Trainer.





8.68 m (28 ft 6 in)


10.205 m (33 ft 6 in)


3.47 m (11 ft 5 in)

Wing area

32.65 m2 (351.4 sq ft)

Empty weight

872 kg (1,922 lb)

Gross weight

1,056 kg (2,328 lb)


1 × Gasuden Benz six-cylinder air-cooled inline engine,

97 kW (130 hp)


Maximum speed

130 km/h (81 mph, 70 kn)


3 hr

Time to altitude

42 min to 2,000 m (6,600 ft).

Japanese Aircraft, 1910-1941-Robert Mikesh & Shorzoe Abe
The Mainichi Newspapers Co Ltd
Yushukan War Memorial Museum
Japanese Aircraft of the Pacific War-Rene Francillon,
Japanese Aircraft-John Stroud,
Japanese Military Aircraft Illustrated.


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