47-foot Motor Lifeboat
A USCG 47′ MLB in Morro Bay
|
|
| Class overview | |
|---|---|
| Name: | 47' MLB |
| Builders: | Textron Marine |
| Operators: |  United States Coast Guard |
| Cost: | $1,214,300[1] |
| In service: | 1997–Present |
| Planned: | 227,[2] approx |
| Completed: | 227[2] |
| Active: | 227 |
| 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] |
| Draft: | 1.37 m (4 ft 6 in)[3] |
| Propulsion: |
|
| Speed: | |
| Range: | 200 nmi (370 km) cruising[3] |
| Complement: | 34 Persons, 4 crew, 30 passengers[3][4] |
| Armament: | 1 × M240B machine gun (optional)[4] |
The 47-foot MLB is the standard lifeboat of the United States Coast Guard (USCG). The 47′ MLB is the successor to the 44′ MLB.[5]
At Station Chatham where the new 47-foot boat would draw too much to get over the bar, the 42-foot Near Shore Lifeboat was designed to replace the 44' MLB. [6]
The 47' MLB is designed to weather hurricane force winds and heavy seas, capable of surviving winds up to 60 knots (110 km/h), 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 5456 marine grade aluminum.[3] Designed with a hard chined deep "V" planing hull,[7] the 47' MLB exceeds its displacement speed.[clarification needed] The frame is composed of 17 vertical bulkhead frames, each of which is welded to the deck and hull, and five of which are watertight.[7]
Employing cruise-by-wire control systems,[8] 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) above the water line are recessed retrieval wells,[8] allowing for easier recovery of persons and jetsam, and easier boardings.[3] A watertight survivor's compartment is equipped for comprehensive first aid.[8] It is situated at the combined center of rotation of the ship.[8]
See also
- Cape-class motor lifeboat (the 47′ MLB in service with the Canadian Coast Guard)
- Response Boat – Medium
- 44-foot Motor Lifeboat
- 41-foot Utility Boat, Large
- Trent-class lifeboat (RNLI lifeboat of similar size and performance.)
References
- ↑ 47-foot Motor Lifeboat (MLB)
- ↑ 2.0 2.1 USCG: About Us - Aircraft & Cutters
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 USCG: International Affairs: FMS
- ↑ 4.0 4.1 COMDTINST M16114.25B 47FT MOTOR LIFEBOAT OPERATOR'S HANDBOOK
- ↑ Coast Guard bids adieu to 44-foot boat - Local News Updates - The Boston Globe
- ↑ COAST GUARD COMPASS OFFICIAL BLOG OF THE U.S. COAST GUARD
- ↑ 7.0 7.1 Operational Logistics Support Plan (OLSP) for the 47' Motor Lifeboat (MLB)
- ↑ 8.0 8.1 8.2 8.3 Textron Marine MLB datasheet
External links
- 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
