Type D-class


Koryu Type D Midgets at Kure at war's end.
  (U.S. Navy Photo)

The Koryu (Type D) Tei Gata was an improved version of the Type C midget. Type D's were equipped with more powerful diesels and electric motors and could recharge their batteries faster. These changes again tripled their range. They were four feet longer, weighed 60 tons and could dive to 328 feet. The first Type D, HA-101, was completed in May '44 and accepted into service on 28 May 1945. By war's end, 115 were completed and another 496 hulls were in various stages of construction. At least five Type D's were lost in operations at Okinawa in March 1945.

Units 115
Ships HA-101 through HA-?
Years Completed 1944-1945
Displacement 59.6 tons submerged
Dimensions 86 ft x 9.5 ft x 6.75 ft (dia.)
Machinery 1 diesel: 150 hp

1 electric motor: 500 hp

Speed 8knots / 16 knots
Range 1,000 nm @ 8 knots surfaced/125 nm @ 25 knots submerged
Armament 2x457mm (17.7-inch) TT fwd + (2 torpedoes).
Max. Depth 100 m (330 feet)
Crew 5

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Type D-class


Drawings of both Koryu and Kairyu submarines, copied from Koryu Type D submarines in an assembly shed at the Mitsubishi shipyard, Nagasaki, Japan, circa Sep 1945, photo 1 of 2Koryu Type D submarines in an assembly shed at the Mitsubishi shipyard, Nagasaki, Japan, circa Sep 1945, photo 2 of 2Koryu Type D submarine at the Yokosuka Naval Base, Japan, 8 Sep 1945, photo 1 of 3Koryu Type D submarine at the Yokosuka Naval Base, Japan, 8 Sep 1945, photo 2 of 3
Drawings of both Koryu and Kairyu submarines, copied from 'Extracts from Small Battle Units of Foreign Powers, Appendix III: Japanese Midget Submarines and Explosive Motor Boats', page 38Koryu Type D submarines in an assembly shed at the Mitsubishi shipyard, Nagasaki, Japan, circa Sep 1945, photo 1 of 2Koryu Type D submarines in an assembly shed at the Mitsubishi shipyard, Nagasaki, Japan, circa Sep 1945, photo 2 of 2Koryu Type D submarine at the Yokosuka Naval Base, Japan, 8 Sep 1945, photo 1 of 3Koryu Type D submarine at the Yokosuka Naval Base, Japan, 8 Sep 1945, photo 2 of 3
Koryu Type D submarine at the Yokosuka Naval Base, Japan, 8 Sep 1945, photo 3 of 3Koryu Type D submarines in an assembly shed at the Mitsubishi shipyard, Nagasaki, Japan, 17 Sep 1945Control room of a Koryu type submarine, looking forward, Oct-Dec 1945, copied from the U.S. Naval Technical Mission to Japan Report S-01-7, Jan 1946, pg 117, fig 126; photo 2 of 3Control room of a Koryu type submarine, looking forward, Oct-Dec 1945, copied from the U.S. Naval Technical Mission to Japan Report S-01-7, Jan 1946, pg 117, fig 127; photo 3 of 3Control room of a Koryu type submarine, looking forward, Oct-Dec 1945, copied from the U.S. Naval Technical Mission to Japan Report S-01-7, Jan 1946, pg 136, fig 155; photo 1 of 3
Koryu Type D submarine at the Yokosuka Naval Base, Japan, 8 Sep 1945, photo 3 of 3Koryu Type D submarines in an assembly shed at the Mitsubishi shipyard, Nagasaki, Japan, 17 Sep 1945Control room of a Koryu type submarine, looking forward, Oct-Dec 1945, copied from the U.S. Naval Technical Mission to Japan Report S-01-7, Jan 1946, pg 117, fig 126; photo 2 of 3Control room of a Koryu type submarine, looking forward, Oct-Dec 1945, copied from the U.S. Naval Technical Mission to Japan Report S-01-7, Jan 1946, pg 117, fig 127; photo 3 of 3Control room of a Koryu type submarine, looking forward, Oct-Dec 1945, copied from the U.S. Naval Technical Mission to Japan Report S-01-7, Jan 1946, pg 136, fig 155; photo 1 of 3

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