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The Type IX U-boat was a class of large U-boats built for Nazi Germany's Kriegsmarine from 1936 to 1945. Derived from the preceding Type I class, it was designed as a large ocean-going submarine for sustained operations far from the home support facilities. It appeared in various sub-types: the first four subtypes IXA, IXB and IXC and IXC/40 differed only by an ever widened and lengthened outer hull to increase fuel storage and range. The Type IXD also had an enlarged outer hull, but also a lengthened pressure hull to allow for the installation of additional engines. The Type IXD came in three versions: the type IXD1 used its larger engine room to install more diesel power for higher top speed; the nearly identical types IXD2 and IXD/42 used the extra engine space to install economical cruising engines, extending their range to three times that of the original type IXA design.
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