Japanese submarine Ro-24
Ro-24, originally named Submarine No. 42, was an Imperial Japanese Navy Kaichū-Type submarine, the lead unit of the Kaichū III subclass. She was commissioned in 1920 and operated in the waters of Japan, Formosa, and Chōsen before she was stricken in 1935. Design and description The submarines of the Kaichu III sub-class were a slightly improved version of the preceding Kaichu II subclass, the man difference being an increase in diving depth from . They displaced surfaced and submerged. The submarines were long and had a beam of and a draft of . For surface running, the submarines were powered by two Sulzer Mark II diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, they had a range of at ; submerged, they had a range of at . The submarines were armed with six torpedo tubes, four internal tubes in the bow and two external tubes mounted on the upper deck, and carried a total of ten Type 44 torpedoes. They were also armed with a single deck gun mounted aft of the conning tower. Construction and commissioning Ro-24 was