USCG Icebreaking Tug
The U.S. Coast Guard Cutter Thunder Bay (WTGB-108) clears a channel for vessels to navigate the frozen Hudson River
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| Class overview | |
|---|---|
| Name: | Bay class icebreaking tug |
| Builders: | Tacoma Boatbuilding Company & Bay City Marine |
| Operators: | United States Coast Guard |
| Preceded by: | WYTM-110 |
| In commission: | 1979-present |
| Completed: | 9 |
| Active: | 9 |
| Retired: | 0 |
| General characteristics | |
| Type: | Icebreaker |
| Displacement: | 662 tons |
| Length: | 42.7 m (140 ft) |
| Beam: | 11.4 m (37 ft 5 in) |
| Draught: | 3.8 m (12 ft 6 in) |
| Propulsion: | diesel electric: 2 Fairbanks Morse diesel engines with Westinghouse DC generators, 1 Westinghouse DC motor |
| Speed: | 14.7 knots (27.2 km/h) |
| Range: |
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| Complement: | 17 (3 officers) |
| Armament: | 2 × M240 machine guns |
The USCG Bay-class icebreaking tug is a class of 140-foot (43 m) icebreaking tugs of the United States Coast Guard, with hull numbers WTGB-101 through to WTGB-109.
They can proceed through fresh water ice up to 20 inches (51 cm) thick, and break ice up to 3 feet (0.91 m) thick, through ramming. These vessels are equipped with a system to lubricate their progress through the ice, by bubbling air through the hull.
The WTGB SLEP project includes significant system upgrades and improvements to the propulsion plant; heating, ventilation, and air conditioning systems; installation of an engine-room fire-suppression system; boat launching davit replacement; Oily Water Separator replacement; stack exhaust configuration modifications; hull air-ice lubrication system; and crew habitability improvements to meet current standards (including removal of lead paint). The first WTGB SLEP is scheduled for 12 months; however, once the Yard achieves a satisfactory production labor learning curve (anticipated after Hull #3), the Yard will complete two 140-foot WTGB SLEPs per year, with an anticipated duration of 9 months each. The first of nine cutters (Morro Bay) entered production at the Coast Guard Yard on July 1, 2014.Morro Bay returned to her homeport of Cleveland in September 2015
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