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Powerful Double Acting Diesel Completes 30-Day Non-Stop Run HE large double acting two i cycle engine of M. A .N. type, built by the New London Ship & Engine Co. for the United States shipping board, successfully completed a non-stop 30-day test on July 17. As a matter of fact this engine ran, with the exception of the momentary stop required to reverse, continuously from 8:46 a. m. June 17 until 10:02 p. m. July 18; that is 31 days, 138 hours and 16 minutes. The shipping board did not officially start the 30-day run until the evening of June 17. During the 30-day test the average indicated horsepower developed was 4990 and the average brake horsepow- er was 3680 at 115 revolutions per minute. After the 30-day test a 6-hour ten per cent over load trial was held at which the brake horsepower was 4035 at 115 revolutions per minute. This was followed by a 4 hour 15 per cent over load test at which the aver- age brake horsepower was 4249 at 121 revolutions per minute. Tests were then held for 6, 4, 2 and 1 hour at 75 per cent, 50 per cent, 25 per cent, of full load and full speed astern. The average horsepower and_ revolutions corresponding were 2761 at 105; 1845 at 91; 925 at 73. The revolutions at full speed astern were 111, the brake horsepower was not determined. More Power in Less Space With the advent of the double acting diesel engine for marine service a pro- gressive step has taken place in the application of the internal combustion engine for sea going ships of all types and sizes. Ship owners, who are at all conversant with the increasing success of motor ships, have doubtless realized that sooner or later they would utilize the diesel engine in their fleets. Some have possibly been deterred from tak- ing this action by the initial invest- ment required, others through lack of information on the subject, and still others by the belief that the large slow - speed diesels “ were passing through an evolutionary stage in type and design. This latter thought has proved correct, but progress has been relatively slow, covering as it has, a period of over a dozen years. It is well known that the single acting diesel engine has operated on the high seas for many years with great satisfaction to its owners. These engines have thoroughly proved the reliable operation of motorshirs and have effected large annual savings. Competitive conditions however, de- manded ships of greater earning pow- er which in turn means more dead- weight tonnage and cubic capacity, when considering hulls of similar char- acteristics. The attainment of addition- al carrying capacity necessitated a re- duction in the engine room length, as well as in the total weight of the pro- pulsive machinery. These advantages could only be obtained, to the highest degree, by the introduction and appli- cation of the double acting principle. The engine illustrated was built by (Continued on Page 52) DOUBLE ACTING M. A. N. TYPE 2-CYCLE DIESEL ENGINE BUILT BY NEW LONDON SHIP & ENGINE CO. FOR THE SHIPPING BOARD, COMPLETED SUCCESSFULLY A 380-DAY NONSTOP RUN ON JULY 17—AVERAGE B. H. P. 3680 AT 115 R. P. M. MARINE REVIEW—August, 1927 13