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Double Acting Diesel (Continued from Page 13) the New London Ship & Engine Co. -at Groton, Conn., and represents the latest development of the 2-cycle, double acting engine in this country. It develops 3680 shaft horsepower at 115 revolutions per minute, and is of the 4-cylinder, air injection type with scavenging pump. attached. Combus- tion takes place above and below the piston in each cylinder during every revolution, resulting in the smoothest possible flow of power through the crankshaft. One can readily appre- ciate that the 2-cycle, double acting type represents the final development of the internal combustion engine as it is obviously impossible to obtain a greater number of combustions from one cylinder during a revolution. Completed 30-Day Non-Stop Run The engine has just completed a thirty day non-stop full load test carried on under the supervision of representatives from the United States shipping board, to whom the engine will be delivered. During this run, the engine developed a continuous output of 3680 brake horsepower when operated at a speed of 115 revolutions per minute. The length of the test was selected in order to compare with the longest sea run which shipping boara vessels are called upon to make. It is interesting to note that this run, car- ried out without any stops whatsoever, constitutes the longest test to which an engine of this size has ever been subjected in this country. This display of reliability and continuous power output, has amply demonstrated the excellence of design, workmanship and material employed by its builders. This 3680 shaft horsepower Nelseco 2-cycle, double acting engine, type D4Z70/120 will be installed in the steamer WILLSCOx. This ship is 9500 deadweight tons, 420 feet in length, 54 feet in width, 33 feet 9 inches in depth and was originally fitted with a 2800 indicated horsepower steam engine She is of the Oscar Daniels type and was built at Tampa, Florida. The additional horsepower will result in considerably more speed than the ship developed formerly. A brief review of the original de- sign and development of the first large double acting diesel engines will, we believe, be of interest, inasmuch as it illustrates the long and painstaking efforts devoted to the attainment of this advanced type of prime mover. Early in 1911 the Maschinenfabrik Augsburg-Nurnberg, A. G., of Augs- burg, Germany, who were the pio- neers in the development of the diesel engine and are the licensors of the 52 -a_ 6-cylinder, New London Ship & Engine Co., un- dertook the design and construction of 2-cycle double acting engine to develop 12,000 shaft horse- power. This engine was for the ac- count of the German admiralty for use in a light cruiser. Due to the mag- nanimity of the order, M. A. N. first constructed a single experimental cyl- inder of 2000 horsepower, which was the basis for its design of the larger engine. After due tests and experi- mentation the 12,000 horsepower en- gine, at that time the largest diesel engine in the world, was finally fin- ished and successfully passed tests at the M. A. N. Nurnberg shops. The in- tervention of the World War delayed the development of similar units and it was not until 1920 that the M. A. N. company again took up the construc- tion of other large 2-cycle double act- ing engines. Convinced that they could improve on the 1911 effort, they again built a single: experimental cyl- inder and carried on extensive tests in the perfection of details in design and construction. The result of this effort was the placing of an order with M. A. N. from the Hamburg Electric Co. for a 15,000 brake horsepower, 2- cycle, double acting engine. This en- gine of nine cylinders is the largest diesel engine in the world and is now operating in Hamburg to the entire satisfaction of its owner. Orders for Marine Propulsion Simultaneously with this develop- ment, M. A. N. began receiving large orders for marine service. Prominent among these is the motorship AUGUS- Tus built in Italy by Cantieri Officine Savoia. This ship is a passenger liner of the most modern type, equipped with quadruple screws, each propellor being driven by a 7000 shaft horse- power 2-cycle, double acting engine. Other orders received by M. A. N. during 1926 included two 5400 horse- power, 7-cylinder, 2-cycle double act- ing engines to be installed in a freighter for the Hamburg Amerika line. Also two 5-cylinder engines of the same cylinder size and developing 3750 horsepower for single screw freighters of the same company. The North German Lloyd of Bremen have contracted for a 6-cylinder unit, de- veloping 4600 horsepower, which will be installed in a freight vessel. Recent orders received include two large stationary engines, each rated at 11,700 brake horsepower, both of which will be installed in the Maerk Power house, Berlin. Three smaller units, developing 2230 horsepower each, have been contracted for in Russia and will be installed in the Stalingrad Iron Works. The Rotterdam MARINE REVIEW—August, 1927 Lloyd of Rotterdam will install in their new passenger ship, the KoTA GEDE, a 7-cylinder 5200 brake horse- power, 2-cycle double acting engine. The Hamburg Amerika line has placed an order with the Bremer Vulkan Vegesach for a 17,000 ton freight and passenger ship in which will be installed four M. A. N. double acting engines. The motorship BRAUNSFELS has re- cently undergone her trial trip and is now at sea. This ship is equipped with one 4000 brake horsepower, 6- cylinder, 2-cycle double acting engine. The above list is not complete and represents only a partial list of two cycle, double acting engines now under construction by the M. A. N. company and its licensors throughout the world. It illustrates however, the enthusiastic reception which this design and type has received, both in Europe and this country. Offering as it does, marked advantages in the reduction of weight and space and also in manufacturing costs of the engine proper, it is evi- dent that this type will greatly appeal to ship owners who are desirous of equipping their vessels with the most modern and economical type of diesel engine for large ocean gcing vessels. Buy Boats. for Chicago St. Louis Service It is reported that a $200,000 con- tract for construction of two Sunco towboats and barges, the first to be operated commercially in the Sunco System for waterways transportation, has been let to the Nashville Bridge Co., Nashville, Tenn., by the Standard Unit Navigation Co., St. Louis. With completion of the Sunco tow- boats, of 860 and 150 horsepower re- spectively, to be driven by propellers of the water tractor type, specifica- tions will be submitted for bids on construction of an _ additional 20 barges, which will complete the first fleet of the system. The initial con- tract specifies completion of the boats in 60 to 90 days. According to Carl J. Baer, presi- dent of the Standard company, the first fleet will be ready for operation about Jan. 1. This fleet is designed to handle freight between St. Louis and Chi- cago via the Illinois river, co-operat- ing with the Mississippi River War- rior Barge Line as a feeder for freight to and from points on the lower Mississippi. The steamer Henry Corr is en- - gaged in carrying scrap from Detroit to the Otis Steel Co., Cleveland. Finished products such as sheets are carried back.