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Diesel Direct Drive in Ferry Multnomah One Engine— 250 B. H. P. Engine Name of Engine—Atlas-Imperial; Year—1927 Builder—Atlas Imperial Engine Co.; Cycle—4 No. of Cylinders—6; B. H. P.—250; Action—Single Injection—Mechanical, solid; Scavenging—None Piston Cooling—No; Bore—11 in.; Stroke—15 in. R. P. M.—275; Pisten Speed—687 ft. per minute B. H. P. per Cyl.—42; Stroke to Bore—1.36 Reversing—Direct reversing Vessel Name—Multnomah; Type—Double ended ferry DESCRIPTION The double ended ferryboat MULTNOMAH is equipped with one engine of this’ size and power. Owing to logs, snags, etc., en- countered during win- ter months, the engine is built with clutches fore and aft connect- ing with a propeller on each end. The engine is direct reversible and it is therefore pos- sible to operate with the one propeller Main Drive—Direct diesel, screw at each end Length B. P. P.—146 ft.; Beam—44 ft. Depth—10 ft. 7 in.; Draft—6 ft. 6 in. No. of Propellers—Two, one at each end Fuel Consumption—Lbs. per b. h. p. per hr.—0.4 -~ Remarks This double end ferry boat has just been com- pleted for the county of Multnomah, Oreg., and: is to operate as a ferry at Portland, Oreg., on 24-hour service. Due to shallow draft requirements the pro- pellers operate ‘in tunnels. Some of the Standard Sizes of Engines Built R. P. M. Cycle 300 275 825 300 275 275 400 325 300 300 275 275 250 LALA LER RR ARARAWMRHOAARARA CO No. of Cyl. 3 Cylinder Diameter Net Weight 10. sin. 16,000 in. : 27,300 in. 14,700 in. in. 18,100 in. ; i 27,500 i i 31,000 12,000 17,640 23,000 24,000 37,500 42,000 61,000 Double ended diesel ferry MuLTNoMAH—One 250 B. H. P. diesel engine clutch connected to propeller at each end MARINE REVIEW—November, 1927 51