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Diesel Direct Drive in Tanker Blue Sunoco Two Engines—Each 500 B. H. P. DESCRIPTION This tanker has twin screws. An engine such as described and illustrated here is di- rect connected to each propeller. The engine is of single acting, solid injection, direct reversible type. The crankshaft for both main bearings and pins is ten inches in diam- eter. The camshaft is built overhead and is driven by a-_ silent chain drive at the cen- ter of the shaft. Engine Name of Engine—Bessemer Diesel; Year—1929 Builder—The Cooper-Bessemer Corp.; Cycle—4 No. of Cyls.—6; B. H. P.—500; I. H. P.—585 Action—Single acting; Injection—Mech. Solid Piston Cooling—Air; Bore—14 in.; Stroke—18 in. R. P. M.—275; Piston Speed—825 ft. p. m. Pressure Brake—85; B. H. P. per Cylinder—83.3 I. H. P. per Cylinder—97.5; Mechanical Eff.—85% Bore to Stroke—1.28; Length O. A.—23 ft. 8 in. Height O. A.—8 ft. 2 in.; Width O. A.—38 ft. 4 in. Wt. Eng.—75,000; Reversing—Direct reversible Air Comp.—Two 15 H. P. independent, two stage Vessel Name—Blue Sunoco; Owner—Sun Oil Co. Builder—Sun Shipbuilding & Dry Dock Co. Type—Twin screw oil tanker; Completed—1929 Main Drive—Two diesel engines direct connected Length B. P.—246 feet 6 inches Depth—18 ft. 6 in.; Draft—15 ft. 6 in. Deadweight—2350 tons; Speed—91% knots No. of Propellers—Two; Cargo Cap.—20,000 bbls. Fuel Consumption—Lb. per b.h.p. per hr.—0.44 Generators—Two auxiliary generator sets of 75 kilowatts at 375 revolutions per minute, each driven by Bessemer diesel engines. Remarks The BLUE SUNOCO is a steel vessel of single deck type and the hull is constructed on the Isherwood bracketless system. The machinery is located aft and so are the fuel oil tanks and pump room. The dry cargo space is forward. A com- plete description of this vessel will be found in the July, 1929, issue of MARINE REVIEW. The BLUE SuNOcO is one of a fleet of the Sun Oil Co. engaged in transporting oil and gaso- line to inland points and is thoroughly modern in construction and equipment throughout. Both engines may be controlled with one lever, so that one engineer can operate the two in any man- euvers. Twin Screw Diesel Tanker BLurE SuNoco—Built by Sun Shipbuilding Co.—Fitted with Two Bessemer Engines. MARINE REVIEW—November, 1929 25