‘Our Gang’ of RAscals Continues to Grow!

June 9, 2016


Recently completed for Port Otago, New Zealand, the latest RAscal 1800 is to be delivered to her owner by heavy lift ship in June. Named Arihi (a Maori name for “of noble kind”), she was built by Sanmar Shipyard, Turkey and delivered just 5 months after the order was placed. Designed by Robert Allan Ltd. of Vancouver, Canada, she is the third of class and has been customized to meet Maritime New Zealand regulations.

RAscal Series are compact tugs with Z-drive or conventional twin screw propulsion capable of towing over the bow or the stern with a single forward winch, the line passing under the pilothouse for stern towing. Alternatively, towing over the stern is possible with a tow hook on the aft deck. Accommodations for four persons are provided in the foc’sle in two cabins. Additionally a galley, mess, and washroom with shower are located below decks. The Arihi is built to ABS class notation:



Particulars are as follows:

Length Overall:
Beam, Moulded:
Depth, Moulded:
Draft, Maximum:
Fuel Capacity:
Potable water capacity:
– 18.7 m
– 9.2 m
– 3.5 m
– 3.9 m
– 33,500 litres
– 5,800 litres


On trials, Arihi achieved:

Bollard Pull, ahead:
Bollard Pull, astern:
Free running speed, ahead:
– 32 tonnes
– 31 tonnes
– 12 knots


The deck machinery comprises a DMT ship-assist hawser winch on the bow and a Data Hidrolic towing hook on the aft deck, with a polished stainless steel fairlead both forward and aft.

The wheelhouse is designed for maximum all-round visibility with a forward control station providing maximum visibility to both fore and aft deck working areas.

Main propulsion consists of a pair of Caterpillar C32 engines rated 970 kW at 1800 rpm driving Veth VZ-900 azimuth drives through straight carbon fibre shafting. The drives are fitted with nozzles and 1700 mm 5-bladed propellers. Electrical power is provided by two Caterpillar C4 generators.

The fendering system consists of one row of 500 x 250 cylindrical fender at the bow with vertical 480 x 300 W-block fenders under. The same W fenders are used across the stern with aircraft tires along the sides of the tug.

For more information on the Arihi or any of the RAscal Series tugs contact us at design@ral.ca.