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Friday, March 29, 2019 

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 490 with an input power of 2,525 kW each, delivering an expected bollard pull of about 82t.

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,” said Capt Steven J. Kress, VP Operations at McAllister Towing.

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 it is 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.

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 the Schottel’s azimuth thrusters to have undergone several technical updates. 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 80t bollard pull class. Today, the standard range includes Schottel ProAnode enhancing corrosion protection, the Schottel HTG (High Torque Gear) technology as well as the latest high-performance nozzles SDC40 and SDV45. To date, more than 1,000 Schottel Rudderpropellers types 490 and 460 have been sold – which the company says represents the most successful azimuth thrusters worldwide.

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