Allied Shipbuilders Delivers Caterpillar-Powered Tug

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Allied Shipbuilders, Ltd., North Vancouver, B.C., Canada, recently delivered the 57-foot 8- inch shiphandling tug Charles H. Cates X to C.H. Cates & Sons Ltd., North Vancouver, B.C.

Based on a design by Vancouver-based naval architecture and marine engineering firm Robert Allan Ltd., the Charles H. Cates X has a molded breadth of 24 feet 2 inches, depth of 9 feet 9 inches and extreme draft of 10 feet. Her propulsion machinery consists of two high-speed Caterpillar 3508 TA main diesel engines, each rated at 650 bhp at 1,600 rpm, coupled to 360-degree azimuthing drives through a 1.1 ratio gear/clutch assembly. The drive shafts contain flexible coupling elements at the input to the Niigata model ZP-56 Zdrives, and the gear reduction of 378 rpm at the propellers are achieved within the Z-drive units themselves.

Electric power for the winch drive, steering unit control and all shipboard services is provided by a pair of 95 kw, 230/3/60 AC generators. Mitsubishi 6D16-T auxiliary engines each drive a Simpower B254C alternator.

The winch drive and Z-drive steering motors are controlled by Mechtronics 59000 series frequency modulating motor drives, to achieve a full range of variable speed control from the AC power supply.

The ship-handling operations of the Charles H. Cates X are carried out from the fore deck, utilizing a single-drum variable speed electricdriven line-handling Burrard Iron Works winch. The Burrard winch stores a 400-foot 2-1/2-inchdiameter Round Plait Polyester Samson Braid towing line.

The all-steel Cates X will operate in Vancouver Harbor providing ship assist services. For free literature detailing the boatbuilding services of Allied Shipbuilders, For literature completely describing the naval architecture and marine engineering services of Robert Allan Ltd.,

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