 These supplied steam for one set of Brown, Boveri & Cie turbines, which provided power for the center three-bladed screw.The O-class ships were designed to store 1,000 tons fuel oil for the high pressure boilers, and up to 4,610 tons of diesel oil for the diesel engines.This enabled a maximum range of 14,000 nautical miles at a cruising speed of 19 knots.