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The Yokosho K1Y Navy Type 13 Trainer was produced to replace the existing I-go Ko-gata and Avro 504 seaplane trainers, and was in use from the mid 1920s until the early part of the Pacific War, although in decreased numbers from 1930.
The Yokosho I-go Ko-gata was a twin float trainer introduced in 1920 and largely withdrawn from service in 1924.The Avro 504 had been introduced into Japan in 1921 and put into production as both a land plane and a float plane.
Work on the new design began in 1924. The aim was to produce a single aircraft that could take interchangeable wheels or floats, avoiding the need for two pools of training aircraft. Chief Designer Masasuke Hashimoto produced a two-bay biplane, using a wooden framework for both fuselage and wings, with fabric covering. It was powered by a 130hp Gasuden Benz engine. The new design was a success, and it was accepted for production in October 1925.
Around 104 were built. Yokosho built six in 1925. The first forty or so production aircraft were built in 1925. Kawanishi produced another batch of 48 in 1928-33, with the internal designation Type 0. Finally Watanabe produced ten aircraft in 1933-34.
The aircraft was known as the Type 13 Land-based trainer K1Y1 in its land plane version. When given twin floats (and a small tail float) it became the Type 13 Seaplane Trainer K1Y2. The seaplane was somewhat heavier and slower.
Type 13 Land-based trainer K1Y1
Engine: Gasuden Benz six-cylinder water-cooled inline engine
Power: 130hp
Crew: 2
Span: 33ft 5.75in
Length: 25ft 11in
Height: 10ft 4in
Empty weight: 1,477lb
Loaded weight: 2,046lb
Max speed: 89mph
Climb Rate: 52min 4sec to 9,843ft
Type 13 Seaplane Trainer K1Y2
Engine: Gasuden Benz six-cylinder water-cooled inline engine
Power: 130hp
Crew: 2
Span: 33ft 5.75in
Length: 28ft 5.75in
Height: 11ft 4.5in
Empty weight: 1,922lb
Loaded weight: 2,328lb
Max speed: 80.6mph
Climb Rate: 42min to 6,562ft
Endurance: 3 hours