Martha L. Black-class icebreaker
Name ship of the class Martha L. Black entering the port of Rimouski
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| Class overview | |
|---|---|
| Name: | Martha L. Black class |
| Builders: | Various |
| Operators: |
 Canadian Coast Guard
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| Built: | 1985–1986 |
| In service: | 1986–present |
| Completed: | 6 |
| Active: | 6 |
| General characteristics for George R. Pearkes | |
| Type: | Light icebreaker and buoy tender |
| Tonnage: | |
| Displacement: | 4,662 long tons (4,737 t) full load |
| Length: | 83 m (272 ft 4 in) |
| Beam: | 16.2 m (53 ft 2 in) |
| Draught: | 6 m (19 ft 8 in) |
| Ice class: | Arctic Class 2 |
| Propulsion: | Diesel electric – 3 Alco 251F-16V |
| Speed: | 15 knots (28 km/h) |
| Range: | 14,500 nmi (26,900 km) at 11 knots (20 km/h) |
| Endurance: | 150 days |
| Boats & landing craft carried: |
1 × self-propelled barge |
| Complement: | 25 |
| Sensors and processing systems: |
1 × Racal Decca Bridgemaster navigational radar (I band) |
| Aircraft carried: | 1 × light helicopter |
| Aviation facilities: | Hangar and flight deck |
The Martha L. Black-class icebreakers are a class of six light icebreaker and buoy tenders constructed for and operated by the Canadian Coast Guard. Built in the 1980s, the class operates on both coasts of Canada and have been used for operations in the Arctic region, including the search for the ships of Franklin's lost expedition.
All vessels in the class displace 4,662 long tons (4,737 t) fully loaded and are 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 vessels have varying commercial tonnages; George R. Pearkes has a 3,809.1 gross tonnage (GT) and a 1,517.3 net tonnage (NT);Martha L. Black has a gross tonnage of 3818.1 and a net tonnage of 1529.4;Sir Wilfrid Laurier has a gross tonnage of 3812.1 and a net tonnage of 1533.6;Ann Harvey has a gross tonnage of 3823 and a net tonnage of 1528;Sir William Alexander and Edward Cornwallis have a gross tonnage of 3727.2 and a net tonnage of 1503.0.
The vessels are 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 ships are also equipped with one Caterpillar 3306 emergency generator. The speed of the vessels ranges from 15 to 16.5 knots (27.8 to 30.6 km/h; 17.3 to 19.0 mph). The vessels have varying diesel fuel capacity, ranging from Ann Harvey at 780 long tons (790 t) to George R. Pearkes and Martha L. Black at 1,086 long tons (1,103 t). The range of the vessels, based on speed and fuel capacity, is varied. The ships are certified as Arctic Class 2.
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