The AVT (Advanced Voith Tractor) designation applies to Voith-propelled tugs designed by Robert Allan Ltd. for harbour or offshore terminal operations that feature the unique sponsoned hull forms similar to those used in the RAstar Class tugs. These tugs are classed according to length, and can accommodate a wide range of powers and other equipment, according to individual operational needs.

This class of tug has been the subject of extensive model-testing and full-scale performance verification. The AVT Class Tugs currently in operation are noted for their exceptional escort performance and sea-keeping capability.

The following AVT designs are available, capable of adaptation to any unique set of operational needs:

AVT 2700
AVT 2900
AVT 3000	under development
AVT 3200	under development
AVT 3400	under development
AVT 3500
AVT 3600
AVT 3700	under development
AVT 3900	under development

Any other unique new design is also possible, developed to suit the Clients specific operational needs.