Ville-class tug

The Ville-class harbour tugboats are a class of tugboats employed by the Royal Canadian Navy.

Canada operated a fleet of 17-ton tugs, built during the Second World War which were also called the Ville class. The current vessels are named after those vessels. There is confusion that the current Ville-class design was based on the British Pup-class tugs. The original 17-ton version was based on that design, however the new Villes are an independent design.

Design
The Ville class were designed by the Canadian naval architecture company Robert Allan Ltd as harbour tugs. They have a low-slung shape that is ideal for tight maneuvering and nudging exercises on larger ships. Their kort-nozzle allows for a greater bollard pull however it loses its pull at anything over 10 kn and loses speed in turns. The Ville class are 13.71 m long with a beam of 4.72 m and a draught of 2.74 m.

Propulsion
Members of the class built on the east coast were given one Caterpillar 3406 diesel engine that provides 365 hp and Ville-class tugs built on the west coast were supplied with one Caterpillar D343 diesel engine rated at 365 hp. This power is directed towards a steerable kort nozzle which gives the class a speed of 9 kn.

Towing
The Ville class has a max bollard pull of 7.5 tons, denoting them as small tugboats. The bollard pull measures the amount of pulling or pushing power a ship has.

Other auxiliary ships
The Royal Canadian Navy operates six other, larger tugboats, the 140-ton CFAV Tillicum, and five 250-ton tugs, and two 140-ton s.  The larger tugs are also split between both coasts.