47-foot Motor Lifeboat
| 300px A USCG 47′ MLB in Morro Bay | |
| Class overview | |
|---|---|
| Name: | 47' MLB |
| Builders: | Textron Marine |
| Operators: | 22x20px United States Coast Guard |
| Cost: | $1,214,300[1] |
| In service: | 1997–Present |
| Planned: | 200[2], approx |
| Completed: | 117[2] |
| General characteristics | |
| Displacement: | 18 t (20 short tons)[3] |
| Length: | 14.6 m (47 ft 11 in)[3] |
| Beam: | 4.27 m (14 ft 0 in)[3] |
| Draught: | 1.37 m (4 ft 6 in)[3] |
| Propulsion: |
2 × Detroit Diesel 6V92TA DDEC-III engines, 435 hp (324 kW) each[3] 1,500 liter (200 imperial gallons) fuel capacity [3] |
| Speed: |
25 knots (29 mph; 46 km/h) maximum 22 knots (25 mph; 41 km/h) cruising[3] |
| Range: | 200 nmi (370 km) cruising[3] |
| Complement: | 4 crew, 5 passengers[3] |
| Armament: | 1 × M240B machine gun (optional)[4] |
The 47-foot MLB is the standard lifeboat of the the United States Coast Guard (USCG). The 47′ MLB is the successor to the 44′ MLB.[5]
The 47' MLB is designed to weather hurricane force winds and heavy seas, capable of surviving winds up to 60 knots, breaking surf up to 6 m and impacts up to three G's.[3] If the boat should capsize, it self-rights in less than ten seconds with all equipment fully functional.[3]
The boat's hull and superstructure are constructed entirely from marine grade aluminum.[3] Designed with a hard chined deep "V" planing hull,[6] the 47' MLB exceeds its displacement speed. The frame is composed is 17 vertical bulkhead frames, each of which is welded to the deck and hull, and five of which are watertight.[6]
Employing fly-by-wire control systems,[7] the boat can be operated from four different locations: two from the enclosed bridge, and two amidships from an open bridge.[3]
Situated less than 1 ft (30 cm) from the water line are recessed retrieval wells,[7] allowing for easier recovery of persons and jetsam, and easier boardings.[3] A watertight survivor's compartment is equipped for comprehensive first aid.[7] It is situated at the combined center of rotation of the ship.[7]
References
See also
- Cape class motor life boat (the 47′ MLB in service with the Canadian Coast Guard)
- Response boat-medium
External links
| USCG 47-foot Motor Lifeboat
]]- US Coast Guard Datasheet on the 47 MLB
- Textron Marine contractor for the USCG 47 MLB
- MetalCraft Marine contractor for the CCG 47 MLB
- military.com
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