Powerful McAllister Tug Propelled by SCHOTTEL


Published Mar 27, 2019 5:26 PM by The Maritime Executive

SCHOTTEL has secured a contract with American tug operator McAllister Towing to provide propulsion units for a new-built escort and harbour tug. The tug is under construction at Washburn & Doughty shipyard in Maine, USA. It will be equipped with two SCHOTTEL Rudderpropellers type SRP 490with an input power of 2,525 kW each, delivering an expectedbollard pull of about 82 tons.

More than 70 azimuth thrusters propelling McAllister tugs

The new tug continues a long-standing co-operation between McAllister Towing and SCHOTTEL. Over 30 years ago, McAllister was SCHOTTEL’s first towing customer in the United States. Since then, SCHOTTEL has delivered more than 70 azimuth thrusters to US-based tug operator McAllister. “SCHOTTEL, with its experience and customized solutions, not only meets but often exceeds the requirements in today’s modern maritime industry. Besides highly efficient products, SCHOTTEL’s competent advice and good service make the propulsion experts a reliable partner when it comes to providing our vessels with the best propulsion efficiency at all times,” says Captain Steven J. Kress, Vice President Operations at McAllister Towing.

Powerful due to SCHOTTEL Rudderpropellers

The main propulsion for the tug consists of a pair of Caterpillar CAT 3516 engines, each driving a SCHOTTEL SRP 490 azimuthing stern drive unit with fixed pitch propellers 2,800 mm in diameter and enabling a free running speed of more than 14 knots. In combination with an input power of 2,525 kW and an input speed of 1,800 rpm itis expected to provide a bollard pull of about 82 tons. The ASD-type tug is designed for harbour and terminal operations as well as for coastal towing.

SRP490: state-of-the-art thruster with many design updates

Rudderpropellers with a maximum power rating for tug duties between 2,350 and 2,550 kW per engine, such as the SRP 490 and the SRP 460, are among SCHOTTEL’s azimuth thrusters that have undergone several technical updates to offer customers state-of-the-art design, construction and economical operation. The SRP 460, formerly SRP 1515, was first delivered in 1999. The thrusters have been continuously updated for two decades so that nowadays the SRP 490 is suitable for the 80 tonbollard pull class. Today, the standard range includes SCHOTTEL ProAnode enhancing corrosion protection, the award-winning SCHOTTEL HTG® (High Torque Gear) technology as well as thelatest high-performance nozzles SDC40 and SDV45. To date, more than 1,000 SCHOTTEL Rudderpropellers types 490 and 460 have been sold – making them the most successful azimuth thrusters worldwide.  

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