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PROPULSION: DESIGN “One of the reasons we like the Nautican nozzles is historically other systems were only good up to a speed of eight or nine knots. After that, they would start contributing to the resistance instead of helping. With the Nautican design nozzle, they’re effective at much higher speed.” – Sal Guarino of Guarino & Cox, LLC (GCL) naval architects well. But, any operator can put together this enviable team

Full Steam Ahead

The tugs meet SOLAS requirements and have a fuel to create similar performing vessels. That said; Bouchard capacity of 600 cubic meters which requires the hull to did it ? rst.

be double hulled. “Most have a fuel capacity of less than 600 cubic meters, but these particular tugs have a higher fuel capacity for a greater range,” says Cox. “They also

Kathy A. Smith is a Victoria, BC-based have an ABS notation called ACCU, which makes for a maritime writer who has penned over 100 higher level of automation and monitoring, with a cen- published trade articles. tral control room to monitor the engine room and ma- chinery from.”

Typically when ATBs are going at full speed in open water, it’s relatively easy to have a rudder that does the job. “But when you’re coming in and out of a port, you’re using signi? cantly lower speed and yet you need to do much more turning and handling and maneuvering than in ocean transit,” says Reynolds Boyd. “That’s where the triple rudders are really outstanding. According to our test- ing, they provide 70 percent of bollard in side force. These boats were a signi? cant step for us in terms of actually get- ting the speed out of the system that it’s capable of get- ting. Both the hull and the propulsion system have to be designed for it. We’ve seen a tremendous surge in interest for our system on ATBs because those boats are perform- ing so well.”

The ability to stay connected to the barge at all times continues to prove to be the safest, most reliable and ef- ? cient way for Bouchard to transport petroleum prod- ucts. “These are high end rudders that prove to produce the most ef? cient control for vessels of this capacity,” says

Bouchard’s Shaw. “Both ATB units have been exceeding all performance expectations, and consistently deliver at maximum ef? ciencies. Their design continues to prove to be a reliable and safe transporter for both our customers and their crew.”

It shouldn’t be a surprise that one of the nation’s biggest and most experienced operators of ATB’s, also has become one of the most ef? cient, and environmentally correct, as www.marinelink.com 29

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