page_title: Kaichū type submarine
section_title: Kaichū VII (Sen-Chū, Ro-35 class)
hierarchical_section_title: Kaichū type submarine / Class variants / Kaichū VII (Sen-Chū, Ro-35 class)
caption_attribution_description: English: Japanese Submarine RO-50(CHU-class or KAICHU-class type-VII). 日本語: 日本海軍中型(海中7型)呂50潜水艦
context_page_description: The Kaichū type submarine submarines were double-hulled medium-sized submarines of the Imperial Japanese Navy during World War II. They were derived from the Kaigun-shiki Chū-gata Sensuikan.
  Several variants existed. From 1934 to 1944, the K6 type and the K7 type were built. They were equipped with a 76.2 mm L/40 gun and four 53 cm torpedo tubes for ten type 95 Long Lance torpedoes.
  Most of these submarines were destroyed in combat, suffering from Allied anti-submarine warfare measures, and only the Ro-50 survived the war.
context_section_description: Project number S44. The final design in the Kaichū series. They were equipped with a Freon air-conditioner, because the IJN took into consideration that they were to be active on the equator area too. The official IJN designation of these boats was Medium Type submarine (中型潜水艦, Chū-gata sensuikan), also called for short, Medium Type (中型, Chū-gata) or Submarine-Medium Type (潜中型, Sen-Chū-gata).
  
  The IJN planned to build these boats under the following Naval Armaments Supplement Programmes:
  9 boats in the Maru Rin Programme (Boat # 201 - 209)
  12 boats in the Maru Kyū Programme (Boat # 385 - 396)
  15 boats in the Maru Tui Programme (Boat # 640 - 654)
  43 boats in the Kai-Maru 5 Programme (Boat # 5181 - 5223)
  However some of the boats were cancelled and their naval budgets, materials and staffs were transferred to the I-201 class submarines.
  Boats in class
caption: Ro-50 in 1944
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