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Annual Pictured is Z-One the first of two unique tugs built by Trinity. Z-Two is featured on this month's cover, while details of the vessel are found in an article on page 54. Damen Delivers Three Innovative Tugs In May, June and July, Damen Shipyards delivered Melton, Bentley and Lady Madeleine to Howard Smith Towage Ltd. The three tugs — which were ordered in April 1995 — are of the ASD Tug 3211 type, which is an enlarged version of the Damen ASD Tug 3110. During negotiations, the owner specifically required that all the accommodation was to be above deck and the forward fender located at bulwark top level. The three-tier superstructure — with mini- mized wheelhouse size and maximized view from the single control position — was developed in close coop- eration between the owner and Damen. The hull shape of the tugs was derived from Damen's ASD Tug 3110s, but the skeg was altered and extended for- ward to improve the astern sailing characteristics to guarantee high astern speed with full directional control. The strong round bilge hull construction was also inherited from the ASD Tug 3110, which means side and bottom plating oil2 mm, a sheerstrake of 20 mm and fore and aft deck plating of 10 mm. The 107.3 x 39 x 16.4-ft. (32.7 x 11.9 x 5-m) tugs are powered by a pair of Ruston 6 RK 270 diesel engines, which develop 1,800 kW at 1,000 rpm. The engines drive Aquamaster US 2001/3325 thrusters fitted in the aft. Between engines and thrusters, Twin Disc MCD slipping clutches are fitted, designed to ensure pre- cise maneuvering and thrust con- trol. The two auxiliary engines are Cummins, type 6BT 5.9, each dri- ving a 87.5-kVA Stamford genera- tor. The gensets are fitted in the auxiliary engine room between the azimuth propulsion compartment and the engine room. Complete machinery, control and alarm installation is according to the Lloyd's requirements for unmanned engine rooms. The (Continued on page 5£
