Name Type-B submarines Preceded by Junsen type submarine | Operators Imperial Japanese Navy Built 1938-1944 | |
 | ||
Builders Kure Naval Arsenal
Sasebo Naval Arsenal
Yokosuka Naval Arsenal
Kawasaki Shipbuilding
Mitsubishi Heavy Industries Subclasses Type-B (I-15 class)
Type-B Modified 1 (I-40 class)
Type-B Modified 2 (I-54 class) | ||
The Cruiser submarine Type-B (巡潜乙型潜水艦, Junsen Otsu-gata sensuikan) was a class of submarine in the Imperial Japanese Navy (IJN) which served during World War II. The Type-B submarines were similar to the Type-A apart from not having the headquarters installation.
Contents
Class variants
The Type-B submarines were divided into four classes:
Type-B (I-15 class)
Project number S37. Twenty boats were built between 1937 and 1944 under the Maru 3 Programme (Boats 37 - 42) and Maru 4 Programme (Boats 139 - 152).
Type-B Mod.1 (I-40 class)
Project number S37B. Six boats were planned under the Maru Kyū Programme (Boats 370 - 375), all boats were completed. On the outside this class looked the same as the I-15 class; however, they were built from high-tensile strength steel and equipped with diesel engines of a simpler design.
Type-B Mod.2 (I-54 class)
Project number S37C. Twenty-one boats were planned under the Maru Kyū Programme (Boats 627 - 636) and Kai-Maru 5 Programme (Boats 5101 - 5114). Eighteen boats were cancelled in late 1943, because the IJN was setting the Type E submarine (戊型潜水艦, Bo-gata sensuikan) as 1945's main submarines
V22A Type
Project number S49A. Eighteen boats were planned under the Kai-Maru 5 Programme (Boats 5115 - 5132). However, all boats were cancelled in late 1943, because the IJN concentrated on production of Type-E submarine (戊型潜水艦, Bo-gata sensuikan) from 1945 onwards