Allied Shipbuilders Delivers Caterpillar-Powered Tug

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, Circle 7 5 on Reader Service Card For literature completely describing the naval architecture and marine engineering services of Robert Allan Ltd., Circle 7 6 on Reader Service Card

Maritime Reporter Magazine, page 20,  Apr 1989 John W. Milligan

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.