10 THE INTERNAL-COMBUSTION ENGINE 



Steamer. Motor ship. 



Displacement, tons 18,690 18,730 



Gross tonnage, tons 9,050' 9,050 



Actual mean sea speed, knots 1 1.5 11.5 



Revolutions per minute 70 115 



Indicated horse-power ■ 4,500 



Shaft horse-power 3,500 



Total weight of machinery (tons), including pipes, ventilators, 

 ladders, floor plates, spares, tools, outfit, propellers, shaft- 

 ing, etc 690 911 



Water in system, tons 115 14 



Weight of deck machinery, tons 140 155 



Weight of hull, fittings, equipment, etc., tons 4,575 4,600 



Light displacement, tons 5,520 5,680 



Capacity deadweight, tons 13,170 13,050 



Capacity (bales) cubic feet 590,000 620,000 



Oil bimker capacity, tons (double bottoms) 1,320 1,350 



Oil bunker capacity, tons (tank between tunnels) 120 



Oil bunker capacity, tons (settling tanks) 80 20 



Total oil bunker capacity, tons 1,400 1,490 



Oil consumption per shaft horse-power, main engines all pur- 

 poses, pounds 0.95 .... 



Oil consumption per indicated horse-power, main engines, all pur- 

 poses, pounds .... 0.3 1 



Oil consumption per day at sea,, tons 35.65 14.95 



Oil consimiption per day in port, tons 5.5 0.7 



Number of days at sea, per annum 220 220 



Number of days in port, per annum 145 145 



15,500-Knot Voyage. 



Days at sea 55.5 55.5 



Days in port 36.5 36.5 



Total oil consumption at sea, tons 1,980 830 



Total oil consumption in port, tons 200 26 



Reserve oil bimker (for about six days), tons 220 90 



Total oil carried outbound, tons 1,400 946 



Total oil burned on trip out, tons 1,090 428 



Total oil necessary, homebound, tons 1,310 518 



Oil to be purchased abroad, tons 1 ,000 



Weight of crew and stores, tons 50 50 



Fresh water on board at start of each leg, tons 300 75 



Total weight of vessel, including fuel, water, etc., outbound, tons 7,270 6,751 



Total weight of vessel, including fuel, water, etc., homebound, tons 7,180 6,323 



Cargo capacity, outbound, tons 11,420 11,979 



Cargo capacity, homebound, tons 11,510 12,407 



Cargo capacity, average (two ways), tons 11,465 12,193 



