Olympic-class ocean liner of 29 coal-fired steam boilers in six compartments. However, "Olympic"s boilers were adapted for firing by oil at the end of the First World War, which reduced the number of engine crew required from 350 to 60. The "Olympic"-class ships were long, displacing normally (their draft at this displacement being ), and their tonnage was around 45-46,000 GRT. "Olympic" became the largest ship in the world when it was completed in May, 1911 before losing the title to its sister "Titanic" when she was completed in April, 1912. After the loss of "Titanic" the third sister ship "Britannic" claimed the
Castle-class patrol vessel Castle-class patrol vessel The Castle class was a class of British offshore patrol vessels of the Royal Navy. Two ships were constructed. Both were transferred to the Bangladesh Navy in 2010. The Castle class was designed by David K. Brown and was intended as a series of six offshore patrol vessels for the Royal Navy, designed in response to criticism of the previous for insufficient speed, sub-optimal sea-keeping and lack of a flight deck for rescue helicopters. In the event, only two ships were built, and . Both vessels were built by Hall Russell in Aberdeen, Scotland. These had significant