41-foot Utility Boat, Large

The USCG Utility Boat, or UTB, was a standard utility boat used by the United States Coast Guard for a variety of inshore missions.

A USCG 41 ft (12 m) UTB underway
Class overview
Name: 41-foot Utility Boat
Builders: Coast Guard Yard, Curtis Bay, Maryland
Operators: United States Coast Guard
Built: 1973–1981
In service: 1973–2014
Completed: 207 (CG-41300–cG-41507)[1]
General characteristics [1]
Displacement: 14.25 short tons (13 t)
Length: 40 ft 8 in (12.40 m)
Beam: 13 ft 6 in (4.11 m)
Draft: 4 ft 2 in (1.27 m)
Propulsion: 2 × Cummins diesel engines, 560 bhp (418 kW), 2 shafts
Speed: 26 knots (48 km/h; 30 mph)
Complement: 3

General information

The 41 ft (12 m) UTB was designed to operate under moderate weather and sea conditions where its speed and maneuverability made it an ideal platform.

The boats were welded 5086 aluminum, with a molded fiberglass superstructure and twin Cummins diesel engines with conventional shafts and propellers. They were capable of light towing, and were originally fitted with demountable fire monitors. Typical boat crew was three.

207 boats were constructed at the Coast Guard Yard in Baltimore, Maryland, from 1972 to 1981. These boats replaced the Utility Boat-Large (40 feet) - Mark I, Mark IV, Mark V, and VI, which were also built by the Coast Guard's Curtis Bay Yard over the period 1950 to 1966.

As of 2005 there were 172 operational boats. Beginning in 2008, these aging boats were retired and replaced with the Response Boat-Medium over a 6–10 year period. The last active boat, CG-41410 from Station Muskegon, was taken out of service in Grand Haven, Michigan on 31 July 2014.[2] The 45-foot Response Boat – Medium is the class' replacement.

Machinery characteristics
  • Engine details - (2) Cummins VT-903M, 318 hp at 2600 rpm, 2:1 reduction gears
  • Electrical system - 24 volt DC & a 24V to 12V DC to DC converter
  • Propeller details - (2) 26" D X 28" P x 2" bore, 4-blade Ni-Al-bronze

Performance
  • Speed, maximum at sea state 0 - 26 knots (48 km/h)
  • Speed, cruise at sea state 2 - 18 knots (33 km/h) at 2000 rpm
  • Fuel capacity (diesel) - 486.8 US gal (1,840 L)
  • Range at cruise, sea state 0 - 300 nm (560 km)

Other data
  • Cost - $235,000 (1979)

References
  1. "41-Foot Utility Boat, Large (UTB)" (PDF). U.S. Coast Guard History Program. 2012. Retrieved 27 June 2012.
  2. Braynard, LTJG Katie (July 31, 2014). "Last 41 foot utility boat retired from duty".
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