Odin Class: Patrol Submarine
This class of boat was an improvement on the prototype OBERON. The main changes being an increase in size and displacement, also, the bow was changed to a ramming design. Another change was to position the forward hydroplanes at the top of the pressure hull. This allowed the planes to be turned in, thus protecting them whilst not in use.
The orders for this class were all placed under the 1926 Building Programme. Of the six boats in this class built for the Royal Navy, only one, Odin was built at Chatham. Five other boats of a slightly different specification were built, two for the Australian Navy and three for the Chilean Navy.
Only two of the class, Osiris and Otus survived WWII. For more information and pictures on the Chatham build, select Odin from side menu.