Schottel solutions selected for Crowley’s eWolf tug

Written by Nick Blenkey
all-electric tug

eWolf will be first all-electric Jones Act tug

The first all-electric tug to be built and operated in the U.S., Crowley’s eWolf, will be equipped with several Schottel systems.

As part of the fully integrated electrical package, Schottel is supplying a propulsion system that will give the vessel a bollard pull of around 70 tons. It consists of two electrically driven type SRP 430 LE RudderPropellers (2,050 kW each) with propeller diameters of 2.5 meters.

SRP 430 LE is characterized by its compact design.

The SRP 430 LE is characterized by its compact design. Due to the extremely low installation height of the LE-Drive and the omission of the upper gearbox, the mechanical efficiency is increased by around 3 percent.

Schottel’s delivery scope also includes its MariHub data IoT gateway and monitoring solution. This records and analyzes signals from sensors, machinery and other components which can then be evaluated by certified Schottel experts.

Together with the condition monitoring service ProCMS, MariHub allows for early detection of irregularities in the propulsion system. This predictive maintenance approach significantly increases the availability of the fully electric vessel: ProCMS is able to support the operator’s achievements in reducing maintenance costs and improve maintenance planning.

To be constructed at the Master Boat Builders shipyard in Coden, Ala., and designed by Crowley Engineering Services, eWolf is scheduled to enter operations by mid-2023.

“The eWolf’s zero-emissions design features a propulsion system that will provide a sustainable ship assist solution with enhanced safety and nimble maneuvering capabilities,” said Joshua Ellis, Crowley’s vice president, ship assist services. “Crowley looks forward to working with experienced, innovative partners like Schottel to deliver this groundbreaking ship-assist tug that will offer customers in San Diego sustainable, high-performance operations.”


The eWolf will have a 6 Mwh energy storage system with sufficient capacity enabling the vessel to deliver one full day of normal work without using any fuel. Batteries can supply power to the propulsion system almost instantly, ensuring effective ship support and harbour escort services without emissions.

The tug’s systems are designed for fast-changing load requirements. The vessel has two generators on board for emergency use and to enable longer transit distances at a reduced speed.

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