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
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See all photos of Type D-class on WW2DB
