The K11W served as the basis for the Q3W1 Nankai (南海, “South Sea”) anti-submarine patrol aircraft.
The Q3W1 retained the basic layout of the K11W2, with a circular fuselage and large wing with a straight trailing edge and tapered leading edge. It carried a crew of two with the remaining space allocated for anti-submarine warfare equipment. A single prototype was produced, and made its maiden flight in January 1945. This first flight ended with a wheels-up landing, and after that work on the project was suspended and didn’t resume before the end of the war.
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