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
Explorer-class general-purpose vessel Explorer-class general-purpose vessel The Explorer class was a two-ship class of general purpose vessels of the Royal Australian Navy that served between 1960 and 1995. The Explorer class was a two-ship class of general purpose vessels built for the RAN. The ships had a displacement of 207 tons at standard load and 260 tons at full load. Each was long between perpendiculars and long overall, had a beam of , and a draught of . Propulsion machinery consisted of GM diesels, which supplied to the two propeller screws, and allowed the vessel to reach . The ship's company consisted of