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He Engine Name of Engine—Bethlehem; Year—192€ Builder—Bethlehem Shipbuilding Corp. Ltd. Cycle—Two; No. of Cylinders—4; I. H. P.—424 B. H. P.—320; Action—Single; Injection—Airless Scavenging—Built in scavenging pump, port scav. Cooling—None; Bore—14% in.; Stroke—21 in. R. P. M.—220; Piston Speed—770 ft. p. m. Pressure Indicated—60; Pressure Brake—45 'B. H.-P. per Cyl.—80; I. H. P. per Cyl.—106 Mechanical Eff.—75%; Stroke to Bore—1.475 Working Strokes per Rev.—4 Length O. A.—19 ft. 7 in. (inc. thrust and shaft) Hght. O. A.—10 ft. 8% in.; Width O. A.—6ft. 8% in. MARINE REVIEW Diesel Direct Drive in Tug Hustler One Engine—320 B.H. P. DESCRIPTION One engine of this size and type direct connected to the pro- peller shaft is installed in the tug HUSTLER. This tug is used for towing between Buf- falo and New York via the state barge canal. Two-cycle oil engines of this type are espe- cially adapted for in- stallations requiring simple and _ reliable operation. Moving parts are reduced to a minimum. Weight—One engine 53,000 lbs.; One engine, 165 Ibs. per B. H. P.; One engine, 125 lbs. per I. H. P. Reversing—Direct Vessel Air Compressor—Attached—for starting air Name—Hustler; Type—Tug, state barge canal Main Drive—Diesel, direct-connected Length B. P. P.—70 ft; Beam—17 ft. 6° in.. Depth—9 ft. 6 in.; Draft—9 ft. a os Displacement—120 tons; Speed—12 knots No. of Propellers—One; Fuel Cap.—6000 gals. Fuel Consumption—Lbs. per B. H. P. per hr.—0.46. - The engine illustrated above of two-cycle air- less-injection type is simple in construction. Standard;Sizes of Small-Unit Marine Engines Built Model B.H.P. R.P.M. Cyls. Bore Stroke 4-30-M 120 400 4 8% in. 12 in 6-30-M 180 - 400 6 814 in. 12 in 3-30-M 180 285 3 11% in. 18 in 4-60-M 240 285 4 11% in 18 in 6-60-M 260. 285 6 114% in 18 in 3-95-M 285 250 3 14% in 21 in 4-95-M 380 250 4 144% in 21 in 6-°5-M 570 250 6 144% in 21 in Length Height Width Weight 12 eft. <OnIne 6.6.24 in. 444. 6 ime 15,500 15: ft. 22 sin: 6 ft. 4 in. 4° 4t =: 6 in. 20,200 US -tt. oe in: 9° ft. ban: 5 ft. 10: in: 23,700 16 ft. 4 in; Outta doin: 5. ft. 10. in. 29,000 20 ft. 10 in. Os ttt in, be ftss)0cin: 40,000 U6 ft. 8) in: 11 ft. 4 in. 6 ft. 9 in. 42,800 Vette. fan: V1 ft; 4: Im: 6° £9" in. 52,300 2b ft.<0-an. ie tt. 45n- 6 ft. 9 in. 69,500 November, 1926 2 :