The Sen Ho (SH) type were intended to support seaplanes and flying boats in forward areas where shore facilities were not available and surface ships could not operate. They were able to carry 390 tons of cargo, including 365-tons of aviation gas. The Sen Ho was armed with four trench mortars instead of deck guns that were not available. Only one boat was completed before the war's end.
| Units | 1 (None survived) |
|---|---|
| Ships | I-351 |
| Year(s) Completed | 1944 |
| Displacement | 2,650 tons / 3,512 tons |
| Dimensions | 363.75 ft x 33.5 ft x 20 ft |
| Machinery | 2 diesels: 3,700 hp
2 electric motors: 1,200 hp |
| Speed | 15.75 knots / 6.3 knots |
| Range | 13,000 nm @ 14 knots |
| Armament | 4x533mm TT fwd +
4x3-inch mortars, 7 x25 mm (4 Torpedoes). |
| Max. Depth | 90 m (300 feet) |
| Crew | 77 officers and men |
