turbine blowers. The resulting positive pressure meant that the boiler rooms were accessible only through airlocks. The steam was generated in 20 oil-fired water tube boilers, eleven double-enders and nine single-enders in four banks fired by a total of 227 oil burners. The operating pressure was 23 atm = 24 bar with a steam temperature at the superheater discharge of . The maximum steam generating capacity was 500 tons/h. For harbour operation three boilers with their own blower were available, so that during work periods the main boiler airlocks could remain open. The total heating surface amounted to , the superheater surface and the air preheater surface . The feed water was preheated to and the fuel oil consumption was 33 tons/h or 380 g/HP/h or 800 tons/day, fed from oil bunkers with a capacity of 7,552 tons. SS Bremen had four geared steam turbines that could generate approximately . Each of them had a high pressure, a medium pressure, low pressure and a reverse turbine. In reverse, 65% of the forward power was available. At cruise speed the turbines made 1800 rpm while the propellers made 180 rpm for a power output of . The four propellers were bronze and had a diameter of , pitch of and weighed 17 tons each. The 230 V electric power on the ship came from four diesel generators with a total output of 520 kW. On board, there were total of 420 electric motors, approximately 21,000 lamps, electric cookers and 20 elevators. Blue Riband Bremen was to have made her maiden transatlantic crossing in the company of her sister Europa, but Europa suffered a serious fire during fitting-out, so Bremen crossed solo, departing Bremerhaven for New York City under the command of Commodore Leopold Ziegenbein on 16 July 1929. She arrived four days, 17 hours, and 42 minutes later, capturing the westbound Blue Riband from with an average speed of . This voyage also marked the first time mail was carried by a ship-launched plane for delivery before the ship's arrival. A Heinkel HE 12 floatplane, flown by 27-year-old Luft Hansa pilot Baron Jobst von Studnitz, was launched at sea twenty miles east of Fire Island with 11,000 pieces of mail in six mailbags weighing which it delivered to New York many hours before the ship docked at the North German-Lloyd pier at the foot of 58th Street in Brooklyn. On the