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52 800 H. P. Diesel Engine (Continued from Page 31) der reciprocating type. Oil is drawn from the filter tank and _ forced through the main lubricating oil header by one cylinder while the other cylinder is connected to the crank case sump and delivers through the cooler to the filter tank. An air starter of the standard Win- ton type operating on 400 pounds per square inch is used to start the engine. A forced oiling system is fitted. MARINE REV THEW Oil is delivered by pump from the oil supply tank to a header in the case. From this header oil is dis- tributed to the main bearings and through passages drilled in the crank shaft to the connecting rod _bear- ings, up each connecting rod through a tube to the wrist pin sleeves and then through the wrist pin bearings in the pistons. From the wrist pin bearings the oil drains through the crank case sump. The mufflers are of Winton design and are fitted for both exhaust and in- take. Each engine has a built in September, 1926 thrust bearing of single collar Kings- bury type. The shaft is nine inches in diameter of 30 to 40 per cent car- bon open-hearth steel subjected to rigid inspection. This bearing is par- ticularly ample to efficiently absorb without undue heat and attention, all the thrust exerted by the propeller wheel. Equipment furnished with each engine consists of air bottles, gages, revolution counter, fuel oil service pump and a set of tools. The weight of the engine complete is 110,000 pounds. This engine will furnish power for fairly large vessels. Rotorship Shows Economy on Trials Ge HE rotorship BARBARA recently completed at Bremen, Germany, from plans and specifications by Anton Flettner, has had a successful trial trip. As a result of the out- come of the trial the BARBARA was officially taken over and placed in the service of the Sloman line, Hamburg, who has chartered her. The first voy- age with general cargo will be to Spain and Italy, after which she will be placed in the regular Hamburg- South American service of the com- pany. It will therefore be possible at a later date to publish figures based on actual operation. The ac- companying photograph shows the ro- torship BARBARA on her first trial trip. The appearance is not particularly odd and reports from shipping men present at the trial indicate that the vessel looks perfectly natural. Some of the results of the trial trip are given as follows: At wind- strength No. 4 (Beaufort scale), equal to 14 knots, the ship made a speed of 91/2 knots when driven by the en- gines alone. With one engine only, in combination with the three rotors, the same speed was developed. In other words the addition of the rotors resulted in a fuel saving of 50 per cent, neglecting the comparatively small amount of power required to revolve the rotors. Therefore in this light breeze the wind contributed an amount of power equivalent to about 500 engine horsepower. With a wind- strength of No. 6 to 7, it was possi- ble to maintain the same speed of 91/2 knots without the use of the propeller. This means that 1000 en- gine horsepower were replaced by wind power. The maximum speed ob- tained by rotor power alone and with- out the use of the propeller was 9 1/2 knots. With a wind-strength of No. 7 the ship will travel at about 10.- knots, while with an increase of the wind-strength between No. 7 and 8 the speed will be about 10 to 11 knots. During the trials the rotors ran without noise or vibration. When de- veloping 1000 horsepower the rotors revolved at 80 revolutions per minute. These figures are the same or slightly more favorable than those predicted by Mr. Flettner during his visits to this country. Many representatives of shipping, shipbuilding and the navy, witnessed the trial. A special trip was made for Captain Klemann, United States naval attache, Berlin. The BARBARA is equipped with a sion to two diesel engines of 530 horsepower each. Either one or both engines may be used at will. The two together give the ship a speed of 914 miles without rotors. There are three rotors each 13 feet 2 inches in diameter and 56 feet high. A new aluminum alloy called Lautal metal has been used for making the rotor shells. Central pivots carry the ball bearings which are 381% inches in inside diameter. In a fair breeze the rotors develop 1000 horsepower, or the same power as the diesel engines. With favor- ROTORSHIP BARBARA ON HER FIRST TRIAL TRIP, JULY, 1926 Flettner rudder, which, according to reports of the trial, functioned per- fectly. The rotorship BARBARA is a _ steel vessel of 3000 tons deadweight, 295 feet in length, 48.3 feet in beam and 19 feet deep. She is a cargo car- rier with accommodations for a small number of passengers. The Sloman line, Hamburg, are to use her in the South American trade. There is a single propeller coupled by Vulcan-Foettinger hydraulic transmis- ’ wide range. able wind the rotors alone will give to the ship the same or even a higher speed than that given by the en- gines. A great number of variations of power is possible when using either one or both engines in con- junction with the rotor, resulting in an economy in fuel consumption of y The speed and direc- tion of rotation of each rotor is electrically controlled from the bridge. It will be interesting to watch the operation of the BARBARA in service.