A 3d mod l of the center propeller of the RMS Titanic, although most of are familiar with the four bladed version as her sister-ship the Olympic, the written documentation specified that the Titanic was fitted with a three bladed center propeller with a diameter of 17ft and a pitch of 14ft 6in, although no photographic evidence, however a photograph of the Olympic's center propeller taken in 1913 surfaced which makes it the only known surviving photograph of a three bladed center propeller fitted to either Olympic or the Titanic