The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

THE MARINE REVIEW A 2250-HORSEPOWER BURMEISTER & WAIN DIESEL ENGINE---TWO OF THESE ARE BEING INSTALLED IN A 18,000-TON MOTOR SHIP FOR THE EAST ASIATIC CO. Italian engine; William Doxford & Sons, Sunderland, England, are constructing a particularly interesting opposed-piston motor developed from the Junkers de- sign, while the North Eastern Marine Engineering Co., Wallsend-on-Tyne, England, is building Werkspoor diesel motors under license from the Dutch firm. The most popular type with ship- owners has hitherto been that operating on the 4-cycle principle, particularly the Burmeister & Wain and Werkspoor en- gines, which are to be installed in the majority of the motorships now under construction in Europe. Both of these types have been standardized. They are built in a relatively small number of models, so that the manufacturers will thus be able to: gain all the usual ad- vantages of quantity production. For instance, the Werkspoor company is building 19 engines of one type, each having six cylinders, and those who are conversant with the design of diesel en- gines, will recognize the amount of repetition work that is involved in carry- ing out these orders. Little doubt can exist that the increasing development of marine oil-engine construction will lead to a far higher degree of standard: ization than has ever been thought pos- sible. Already marine diesel engines oi the 4-cycle type have been standardized up to 4000 indicated horsepower; an 8- cylinder motor of this size has a bore of 800 millimeters and a stroke of 1200 millimeters. Some of the novelties in design, in the newer types of British diesel engines, are of the greatest importance, representing as they do, entire departures from orthodox practice. Both Vickers and Doxford in their motors, which have been referred to, are dispensing with the old system of injecting the fuel by means of highly compressed air and are etnploying a mechanical pump for the purpose. This eliminates the. 3-stage air comptfessor working at about 1000 pounds per square inch which is usually employed with diesel engines, and to this extent is an advance upon previous design, although some doubt is still ex- pressed whether the system is equally satisfactory with the lower grades of fuel. Another modification is employed in the Doxford engine, which operates at a compression pressure of less than 300 pounds per square inch, against the normal 480 pounds per square inch in the usual design. This is effected by maintaining the top of the piston at a high temperature. The consequence is that the sections of the motor are lighter than if the higher pressure were adopted, 'launched. February, 1929 the saving in weight naturally reflecting on the cost of production. : Scotts Shipbuilding & Engineering Co., Greenock, , Scotland, is developing a completely new type of engine, which is virtually a combination of the diese} motor with the steam engine, the steam being raised from the heat in the jacket water and the exhaust gases being useq on the under side of the piston for pro. ducing additional power. This arrange. ment gives high efficiency and is said to have the additional advantage of facilj- tating reversing. All the motorship developments now proceeding in Europe are in the direc- tion of fairly large and, in many cases, relatively fast vessels from 6500 up to 13,000 tons, unlike the policy in Amer- ica. which 'leans at... present . towanm: auxiliaries or full-powered vessels, of not more than 4000 tons deadweight carrying capacity. It is . believed tha the most hopeful possibilities for the future, for the application of diesel en- gines lie in the direction of larger boats and plans are already being laid for 15,000-ton or 16,000-ton ships eqtipped with triple screw machinery of 12,000 horsepower. At Rangoon, India, recently, an auxil- iary sailing vessel of 1400 tons was Her engines are designed to burn crude oil. She is built entirely of first-quality teak and only Burmese labor was employed in her construction. The Cunard liner AQUITANIA is_ be- ing equipped with an oil fuel buring outht to take =the place of her coal fired furnaces. Greater operating ef- ficiency is expected from the change while the engine room crew will be reduced from 350 to 50 men. EL LOBITO, ONE OF THE SMALLER MOTORSHIPS UNDER CONSTRUCTION IN GREAT BRITAIN BY JOHN I. THORNYCROFT