RMS Mauretania (1906) launched by the Duchess of Roxburghe. At the time of her launch, she was the largest moving structure ever built, and slightly larger in gross tonnage than "Lusitania". The main visual differences between "Mauretania" and "Lusitania" were that "Mauretania" was five feet longer and had different vents. "Mauretania" also had two extra stages of turbine blades in her forward turbines, making her slightly faster than "Lusitania". "Mauretania" and "Lusitania" were the only ships with direct-drive steam turbines to hold the Blue Riband; in later ships, reduction-geared turbines were mainly used. "Mauretania"s usage of the steam turbine was the largest application
German submarine U-247 German submarine U-247 German submarine "U-247" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. The submarine was laid down on 16 December 1942 at the Friedrich Krupp Germaniawerft yard at Kiel as yard number 681, launched on 23 September 1943 and commissioned on 23 October under the command of "Oberleutnant zur See" Gerhard Matschulat. In two patrols, she sank one ship of 207 GRT. She was sunk by Canadian warships in September 1944. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-247" had a displacement of when at the surface and