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Irving Shipbuilding successfully installs the aft mast for the Canadian HMCS William Hall.

| 2022

According to a tweet published by Irving Shipbuilding on August 30, 2022, shipbuilders successfully lifted and installed the aft (12.1m) and main mast (6.7m) for the future HMCS William Hall. Totaling 10.7 metric tons, these masts carry vital navigational and communication equipment.
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Russian Vyborg Shipyard laid the Purga ice class coastguard ship of project 23550 925 001 Future Royal Canadian Navy's Harry DeWolf class Offshore Patrol Vessel HMCS William Hall (Picture source: Irving Shipbuilding)

William Hall (AOPV 433) will be the fourth Harry DeWolf-class offshore patrol vessel for the Royal Canadian Navy. The class was derived from the Arctic Offshore Patrol Ship project as part of the National Shipbuilding Procurement Strategy and is primarily designed for the patrol and support of Canada's Arctic regions. The keel for William Hall was laid on 17 February 2021.

The Harry DeWolf-class offshore patrol vessels are designed for use in the Arctic regions of Canada for patrol and support within Canada's exclusive economic zone.

The vessel is 103.6 m (339 ft 11 in) long overall with a beam of 19.0 m (62 ft 4 in). The ship will have a displacement of 6,615 metric tons (6,511 long tons). The ship has an enclosed foredeck that protects machinery and work spaces from Arctic climates.

The vessel will be powered by a diesel-electric system composed of four 3.6-megawatt (4,800 hp) generators and two diesel engines rated at 4.5 megawatts (6,000 hp) driving two shafts.

William Hall will be capable of 17 knots (31 km/h; 20 mph) in open water and 3 knots (5.6 km/h; 3.5 mph) while icebreaking in new year ice of 1-meter (3 ft 3 in) thickness.

The ship will also be equipped with a bow thruster to aid during maneuvers and docking procedures without requiring tugboat assistance. The ship will have a range of 6,800 nautical miles (12,600 km; 7,800 mi) and an endurance of 120 days with 65 personnel. William Hall will be equipped with fin stabilizers to decrease roll in open water but can be retracted during icebreaking.

William Hall will be able to deploy with multiple payloads, including shipping containers, underwater survey equipment or landing craft. Payload operations are aided by a 20-metric-ton (20-long-ton; 22-short-ton) crane for loading and unloading.

The ship is equipped with a vehicle bay which can hold pickup trucks, all-terrain vehicles, and snowmobiles. The ship will also have two 8.5-meter (27 ft 11 in) multi-role rescue boats capable of over 35 knots (65 km/h; 40 mph).

The ship will be armed with one BAE Mk 38 25 mm (0.98 in) gun and two M2 Browning machine guns. The patrol ship has an onboard hangar and flight deck for helicopters up to the size of a Sikorsky CH-148 Cyclone.

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