CCGS Sir William Alexander country of registry Canada
CCGS Sir William Alexander is a Martha L. Black-class light icebreaker. Entering service in 1987, the vessel is currently assigned to CCG Maritimes Region and is homeported at CCG Base Dartmouth, in Dartmouth, Nova Scotia. The vessel is named after Scottish explorer Sir William Alexander, 1st Earl of Stirling, who was an early colonizer of Nova Scotia.Description and design
Designed as a light icebreaker and buoy tender, Sir William Alexander and sister ship CCGS Edward Cornwallis differ from the rest of the class by having one less deck in the superstructure and their buoy-handling derricks mounted forward. Sir William Alexander had her derricks replaced by a crane in 1998. Sir William Alexander displaces 4,662 long tons (4,737 t) fully loaded with a 3,727.2 gross tonnage (GT) and a 1,503.0 net tonnage (NT). The ship is 83.0 metres (272 ft 4 in) long overall with a beam of 16.2 metres (53 ft 2 in) and a draught of 5.8 metres (19 ft 0 in).The vessel is powered by is propelled by two fixed pitch propellers and bow thrusters powered by three Alco 251F diesel-electric engines creating 8,847 horsepower (6,597 kW) and three Canadian GE generators producing 6 megawatts of AC power driving two Canadian GE motors creating 7,040 horsepower (5,250 kW). The ship is also equipped with one Caterpillar 3306 emergency generator. This gives the ship a maximum speed of 16 knots (30 km/h). Capable of carrying 784.0 long tons (796.6 t) of diesel fuel, Sir William Alexander has a maximum range of 6,500 nautical miles (12,000 km) at a cruising speed of 13.7 knots (25.4 km/h) and can stay at sea for up to 120 days. The ship is certified as Arctic Class 2.The icebreaker is equipped with one Racal Decca Bridgemaster navigational radar operating on the I band. The vessel is equipped a 980 m3 (35,000 cu ft) cargo hold. Sir William Alexander has a flight deck and hangar which originally accommodated light helicopters of the MBB Bo 105 or Bell 206L types, but in the 2010s, the Bell 429 GlobalRanger and Bell 412EPI were acquired by the Canadian Coast Guard to replace the older helicopters. The ship has a complement of 26, with 10 officers and 16 crew. Sir William Alexander has nine additional berths.Operational history
The ship was constructed by Marine Industries at their yard in Tracy, Quebec with the yard number 451. Sir William Alexander was launched on 23 October 1986 and entered service on 13 February 1987.  The ship is registered in Ottawa, Ontario, and homeported at Dartmouth, Nova Scotia.
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