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British Shipyard Completes Twin Screw Motorship FFICIAL trials of the twin O motorship INCHANGA, built by Workman Clark (1928) Ltd. Belfast, for Andrew Weir & Co., Lon- don, to be used in the service from India and Burma to South Africa and Ceylon, were held March 19 and proved entirely successful. A speed of over 16 knots was obtained on the measured mile. This vessel is the second of three similar ships for this service. The first, the IstrpINGO, was completed late in February and the third, the IncomAtTI, launched Feb. 15 has now been completed at the same yard. In the design and construction of her hull and in equipment, the INCHANGA fully meets the requirements of the convention for safety of life at sea. public rooms for the comfort of the passengers. Leading off the, en- trance hall is a large comfortably fitted lounge, which opens out into a glass screened terrace on each side. Facilities are arranged for the playing of deck games on the boat deck, which has been made as clear of obstructions as possible. On this deck is the smokeroom, leading off which and overlooking the open air swimming pool, is the verandah cafe. On the upper deck is the dining saloon which accommodates over 50 persons at small tables, enabling them to enjoy their meals in the privacy oi their own party. For ventilation and heating pur- poses a full ‘‘Pleno Unit’ system of Isipingo—One of three similar twin screw motorships built by Workman Clark Ltd., Belfast, for Andrew Weir & Co., London Her dimensions are: length, 435 feet; breadth, 57 feet; depth, 37 feet: draft, 25 feet, 3 inches; dead- weight, 8000 tons; and gross ton- nage, 7100. These ships are intend- ed for uninterrupted service in trop- ical waters, First class accommodations are provided for 50 passengers; the cab- ins being designed along the lines of those of the most modern transat- lantic luxury liners, each cabin hav- ing a wash basin with hot and cold fresh water, and its own bathroom and lavatory adjoining. Two de luxe suites are located on the boat deck, which strike a very modern note both in treatment and color, a spe- cial feature being built-in beds of selected walnut. Accommodation for 20 second class passengers is pro- vided in the poop. Arrangements are also made for the carriage of 500 native passengers, Special attention has been paid to the design and furnishing of the 32 mechanical ventilation is installed, a special feature of which is the humidifying apparatus, thus ensur- ing a natural heat in cool weather and also a cool freshness on the hot- test of tropical days. In design the vessel is of closed shelter deck type with long fore- castle and large midship deckhouse in which is contained the passenger and crew accommodation, Five large cargo holds are pro- vided, No. 3 being arranged as a deep tank for the carriage of cargo oil. Ten derricks and ten winches are provided for working the five hatches, and all cargo handling gear is of the modern type. <A warping winch is fitted: just aft of No. 5 hatch. All auxiliary machinery is electrically driven, including winches and windlass. Space for the ear- riage of insulated cargo is provided to the extent of 17,000 cubic feet. Large insulated store rooms are pro- vided for meat and vegetables, and MARINE REVIEW—July, 1934 an ice making plant is also included. A Hele-Shaw electric-hydraulic 4- ram type steering gear is located in 2 compartment on the main deck aft. The gear is controlled by a telemotor from the wheelhouse, with an alter- native steering position on the dock- ing bridge aft. Main Propelling Machinery The main propelling machinery consists of two 6-cylinder, airless- injection, two-stroke eycle engines of the new Workman Clark-Sulzer de- sign, the first of their type to be built in the British Isles. These en- gines will each develop 2400 shaft horsepower at 135 revolutions per minute. Scavenge air is supplied by a double-acting tandem pump driven off an extension at the forward end of the crankshaft, Each cylinder has its own direct injection high pressure fuel pump which is operated by cams on a com- mon camshaft situated toward the top of the main frames and driven by a train of gears from the after end of the main crankshaft. Unlike earlier air-injection engines built by Workman Clark Ltd., there is no valve gear or shafting along the cylinder cover level, so that the top of the engine presents an exceeding- ly simple and clean design allowing the easiest access to the cylinders for overhauling, The control gear is placed neatly and compactly at the forward end of the engine on the engine room floor level. There are two hand lev- ers on top of the control gear ped- estal, one for starting and the other for reversing and fuel pump regula- tion, the finer control of the latter being effected by a handwheel on the front of the pedestal. Starting and reversing operations are carried out very rapidly and _ efficiently, the former by a simple motion of the starting lever, and the latter with the assistance of a small three-cylin- der air engine inside the pedestal, which, through gearing and a ver- tical shaft, turns a fore and aft con- trol shaft in way of the fuel pump cams and thus swings the ‘‘ahead’’ or ‘‘astern’’ rollers across to their respective cam on the camshaft, ac- cording to the position of the re- versing lever. The third of these three sisterships, the INCOMATI, successfully completed her official trials on April 23. The main propelling machinery of the INcoMATI consists of two sets of Doxford, opposed piston, oil engines developing together a total of 5750 shaft horsepower. On the measured mile run a speed of over 16 knots was obtained. Four electric generating _ sets, diesel engine driven, provide power for all the auxiliary machinery. Steam 1s Supplied by an oil fired Cochran vertical boiler working at 100 pounds per square inch pressure.