The RAstar Offshore/Escort Tugs designation is reserved for a unique class of ASD tugs, designed with a sponsoned hull form, which has been proven in both model and full-scale testing to provide significantly enhanced escort towing and seakeeping performance. Motions and accelerations are less than half those of comparable sized "standard" tug hulls. These tugs will typically be high-powered, and are intended for operations in weather and sea-exposed areas such as many new LNG terminals where a high standard of sea-keeping is required.

RAstar Class tugs are classified according to their approximate length, e.g. RAstar 3400 (34 metres Length), and a range of powers can be accommodated within each hull size according to the specific operational needs. Accordingly there may be beam variations with the same length series.

Presently, the following RAstar Class tug designs are available:

RAstar 2800 55-75 tonnes Bollard Pull
RAstar 3000 60-75 tonnes Bollard Pull	under development
RAstar 3200 65-80 tonnes Bollard Pull
RAstar 3400 70-95 tonnes Bollard Pull
RAstar 3600 70-100 tonnes Bollard Pull
RAstar 3800 75-110 tonnes Bollard Pull
RAstar 3900 90-120 tonnes Bollard Pull