The Yokosuka K5Y, also known as the Type 93 Intermediate Training Aircraft, was a biplane trainer with unequal-span wings that served in the Imperial Japanese Navy during World War II.
Its bright orange paint scheme, which was applied to all Japanese military trainers for visibility, earned it the nickname “aka-tombo” or “red dragonfly”, after a common insect in Japan.
One K5Y, belonging to the Kamikaze Special Attack Corps 3rd Ryuko Squadron, was credited with sinking the USS Callaghan destroyer on July 28, 1945, marking the last US warship lost to kamikaze attack during the war.
Originally based on the Yokosuka Navy Type 91 Intermediate Trainer, the K5Y underwent a redesign by Kawanishi in 1933 due to stability issues.
It entered service in 1934 as the Navy Type 93 Intermediate Trainer K5Y1, equipped with fixed tail-skid landing gear, and remained in use throughout the war.
Floatplane versions, the K5Y2 and K5Y3, were also produced.
These planes were the primary aircraft used for flight training in the Imperial Japanese Navy Air Service, and as intermediate trainers, they were capable of performing demanding aerobatic manoeuvres.
Although two further land-based versions, the K5Y4 with a 358 kW (480 hp) Amakaze 21A engine and the K5Y5 with a 384 kW (515 hp) Amakaze 15, were projected, they were never built.
Two-seat intermediate trainer for the Imperial Japanese Navy.
Floatplane version, with Amakaze 11 engine.
Floatplane, with 384 kW (515 hp) Amakaze 21.
Projected land-based version with 358 kW (480 hp) Amakaze 21A. Never built.
Projected land-based version with 384 kW (515 hp) Amakaze 15. Never built.
1× fixed, forward-firing 7.7 mm (.303 in) Type 97 aircraft machine gun
1× flexible, rearward-firing 7.7 mm (.303 in) Type 92 machine gun
Up to 100 kg (220 lb) of bombs on external racks.
Sources 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.