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The CH-28s were an improved design based on the CH-13 class design. From Sep '44, most of the surviving units of the class were rearmed with triple-mount 25-mm Type 96AA guns and were fitted with Type 22 radars.
| Builders and Years Completed: |
Various 1942-1944 |
| Displacement: | 420-tons standard. |
| Dimensions: | 160.9' x 22' x 8.8' |
| Propulsion: | 2 diesel engines, 2-shafts, 1,700 b.h.p, maximum speed 16 knots |
| Armament: | 1 x 80-mm (3-inch)/40 cal HA gun, 2 x 13.2-mm mg, 2 depth charge rails, 36 depth charges. |

