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12 Diesel Electric Drive in Walter Wyman Two Engines—Each 325 B.H.P. Engine Name of Engine—Fairbanks-Morse; Year—19 32 Builder—Fairbanks, Morse & Co.; Cycle—Two No. of Cyls.—5; B.H.P.—325; Action—Single Injection—Solid; Scavaging—Pump Piston Coolg.—Oil; Bore—12 in.; Stroke—15 in. R.P.M.— 300; Piston Speed—750 feet per minute B.H.P. per Cyl.—65; Stroke to Bore—1.25 Wkg. Strokes per Rev.—5; Hgth. O.A.—7 ft. 10 in. Length O.A.—17 ft. 1 in.; Width—6 ft. 4% in. Weight—53,015 lbs.; Lbs. per B.H.P.—163 Reversing—None; Air Compressor—50 cu. ft. Vessel Name—WaLTER WyMAN; Type—Inspection vessel Owner—United States Public Health Service Builder—Spedden Shipbuilding Co. Completed—February, 1932 Main Drive—Single screw, diesel electric Length O.A.—100 feet; Beam mld.—23 ft. 2 in. Depth—14 ft. 2% in.; Draft—11 ft. 1% in. Displacement—270 tons; Gross Tonnage—193 Speed—In knots, 11.7; No. of Propellers—One Fuel Capacity—tIn bunkers, 72 bbls., 11 tons Fuel Consumption—Lb. per B.H.P. per hr.—0.42 Radius Without Refueling—1100 miles Generators—Two Westinghouse of 205 k.w. each, at 300 r.p.m., driven by Fairbanks-Morse diesel Main Propulsion Motor—One Westinghouse d.c., double armature, 500 -B.H.P. at 175 r.p.m. Exciters—One attached to each main generator, 125 volts, 25 k.w., Westinghouse Remarks The WALTER WyMAN is one of the most powerful tugs in the quarantine division of the United States Public Health service. This vessel is at- tached to the United States Quarantine Station at Rosebank, Staten Island, N. Y., and is used as an inspection and boarding vessel. The hull is built of wrought iron plates with wrought iron rivets up to the water line. Usual DESCRIPTION Two diesel engines of the type illustrated and described here, each of 325 brake horsepower, direct connected through a flexible coupling to a 205 k.w. direct cur- rent generator, supply the power for one main propulsion motor of double armature type, each armature developing 250 horse- power. The propulsion, motor drives screw mild steel is used for construction above the water. Reliability and ease of maneuvering are as- sured from the type of main drive installed. As described above, there are two diesel engine driven generator sets, each consisting of one of the 325 brake horsepower engines described and illustrated on this page, connected through flex- ible coupling with the generator. Each generator develops 820 amperes at 250 volts full load, and 300 revolutions per minute. The electric current generated is delivered to one double armature, direct current, propulsion motor, direct connected to the propeller. This electric motor supplies 500 horsepower to a three-blade bronze propeller, 96 inches in pitch and 96 inches in diameter, at 175 revolutions per minute. It can be controlled either from the pilot house or from the engine room by a switch. On the trial trip full power was absorbed with the propulsion motor turning at 180 revolutions. MARINE REVIEwW—November, 1932