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THETIS AND CLASS—Coast Guard Patrol—Twin Screw—Diesel DESCRIPTION First of a group of seven modern, high speed, twin screw, die- sel, off-shore patrol boats, designed espe- - cially for the work of enforcing laws against smuggling. Equipped with twin rudders, these vessels are excellent sea boats, maneuver readily and turn quick- ly. Sea trials demon- strated their steadiness and lack of vibration. Name—THETIS Owner—United States Coast Guard Builder—Bath Iron Works Corp. Naval Architect—United States Coast Guard Launched—Nov. 9, ’31; comp., Nov. 27, ’31 Sister Ships — Avrora, CaAtypso, DAPHNE, Hermes, Icarus and Perseus. The sched- uled delivery for final vessel is April 27, 1932. Classification—Owner’s requirements HULL PARTICULARS Length over all, 165 feet; length between perpendiculars, 160 feet 9 inches; breadth molded, at waterline, 24 feet 1 inch; breadth molded at main deck, 25 feet 3% inches; depth molded, 13 feet 2% inches; maximum draft, 9 feet; mean draft, 7 feet 6 inches; displace- ment loaded, 332 tons; bunker fuel capacity, in tons, 26.7; cruising radius, about 2500 miles; service speed, 16% knots. MACHINERY PARTICULARS Main Engines—Two, 6-cylinder, 4-cycle, air- © less injection, reversing diesel engines built by the Winton Engine Corp. Size, 14-inch bore, 16-inch stroke; 670 brake horsepower each at 450 revolutions per minute. Auxiliary Power—Two, 15 k.w. Westinghouse generators, each direct connected to a 3-cylin- der, airless injection Winton diesel engine. One 5 k.w. Westinghouse generator direct connected to a 2-cylinder, airless injection Winton diesel engine and through a clutch to a Worthington 2-stage air compressor. One emergency 5 k.w. gasoline driven generating set furnished by the Universal Engine Co. = rE 28 a Va } I a } Sa eS 4 ij ; }] | ie — ae | [ | {] Ay a ia i| =. | TI T | or J pat 7 | _, [at] | {hk py aL = (fail a fo re a ‘, a: ae ee = = Hed = AUXILIARY EQUIPMENT Pumps—Warren; Winton; Viking Air Compressors—Worthington; Ingersoll- Rand; National Brake & Electric Co. Windlass—Hyde Windlass Co. Steering Gear—Sperry Gyroscope Co. Propellers—Hyde Windlass Co. Blowers—American Blower Corp. Oil Coolers—Schutte-Koerting & Co. Oil Purifier—Hydroil Corp. Whistle—Allan Cunningham Horn—(Pneuphonic) and SV type compres- sor, Westinghouse Air Brake Co. Boiler (heating)—-American Radiator Co. Radiators (copper)—McQuay Radiator Corp. Refrigerating Equipment—Westinghouse Anchors, Chain—Baldt Anchor, Chain & F. Corp. Searchlights—Sperry Gyroscope Co. Windows—Kearfott Engineering Co. Galley Range—Ingle Mfg. Co. Marine Hardware—The Dayton Mfg. Co. Electric Motors—Diehl Mfg. Co. Stern Bearings—B. F. Goodrich Rubber Co. Thrust Bearings—Kingsbury Machine Works Lifeboats, Davits—Welin Davit & Boat Corp. Unusually comfortable quarters are provided for officers and crew. Machinery arrangement in the engine room has been very carefully laid out to give maxi- mum accessibility and convenience in operation. Contract for all seven of these vessels was awarded the Bath Iron Works Corp., Jan. 9, 1931 at a cost of $195,000 each. The bid of the Bath Iron Works was the lowest of thirteen. =© Gs A sme ae Fi a5 eo MARINE REVIEw—April, 1932 25