Jump to content

47-foot Motor Lifeboat: Difference between revisions

From Wikipedia, the free encyclopedia
Browse history interactively
← Previous editNext edit →
Content deleted Content added
VisualWikitext
→External links: rm {{Commons}} link. No categories for this subject there.
m typo fix
Line 48: Line 48:
The 47' MLB is designed to weather hurricane force winds and heavy seas, capable of surviving winds up to 50 knots, breaking surf up to 6 m and impacts up to three [[G's]].<ref name="uscg3"/> If the boat should [[capsize]], it self-rights in less than fifteen seconds with all equipment fully functional.<ref name="uscg3"/>
The 47' MLB is designed to weather hurricane force winds and heavy seas, capable of surviving winds up to 50 knots, breaking surf up to 6 m and impacts up to three [[G's]].<ref name="uscg3"/> If the boat should [[capsize]], it self-rights in less than fifteen seconds with all equipment fully functional.<ref name="uscg3"/>


The boat's [[hull (watercraft)|hull]] and superstructure are constructed entirely from 5456 marine grade aluminum.<ref name="uscg3" /> Designed with a hard [[Chine (boating)|chined]] deep "V" [[Planing (sailing)|planing hull]],<ref name="uscg4">[http://www.uscg.mil/directives/cim/4000-4999/CIM_4081_12.pdf]</ref> 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.<ref name="uscg4"/>
The boat's [[hull (watercraft)|hull]] and superstructure are constructed entirely from 5456 marine grade aluminum.<ref name="uscg3" /> Designed with a hard [[Chine (boating)|chined]] deep "V" [[Planing (sailing)|planing hull]],<ref name="uscg4">[http://www.uscg.mil/directives/cim/4000-4999/CIM_4081_12.pdf]</ref> the 47' MLB exceeds its [[displacement speed]]. 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.<ref name="uscg4"/>


Employing fly-by-wire control systems,<ref name="textron">[http://www.textronmarineandland.com/pdfs/datasheets/mlb_datasheet.pdf]</ref> the boat can be operated from four different locations: two from the enclosed bridge, and two amidships from an open bridge.<ref name="uscg3"/>
Employing fly-by-wire control systems,<ref name="textron">[http://www.textronmarineandland.com/pdfs/datasheets/mlb_datasheet.pdf]</ref> the boat can be operated from four different locations: two from the enclosed bridge, and two amidships from an open bridge.<ref name="uscg3"/>

Revision as of 21:58, 31 January 2011

A USCG 47′ MLB in Morro Bay
Class overview
Name47' MLB
BuildersTextron Marine
Operators United States Navy
Cost$1,214,300[1]
In service1997–Present
Planned200[2], approx
Completed117[2]
General characteristics
Displacement18 t (20 short tons)[3]
Length14.6 m (47 ft 11 in)[3]
Beam4.27 m (14 ft 0 in)[3]
Draught1.37 m (4 ft 6 in)[3]
Propulsionlist error: <br /> list (help)
2 × Detroit Diesel 6V92TA DDEC-III engines, 435 hp (324 kW) each[3]
1,500 liter (373 usable imperial gallons) fuel capacity [3]
Speedlist error: <br /> list (help)
25 knots (29 mph; 46 km/h) maximum
22 knots (25 mph; 41 km/h) cruising[3]
Range200 nmi (370 km) cruising[3]
Complement4 crew, 5 passengers[3]
Armament1 × 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]

The 47' MLB is designed to weather hurricane force winds and heavy seas, capable of surviving winds up to 50 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 fifteen 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,[6] the 47' MLB exceeds its displacement speed. 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.[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]

See also

References

  1. ^ [1]
  2. ^ a b [2]
  3. ^ a b c d e f g h i j k l m n [3]
  4. ^ COMDTINST M16114.25B 47FT MOTOR LIFEBOAT OPERATOR'S HANDBOOK
  5. ^ [4]
  6. ^ a b [5]
  7. ^ a b c d [6]
Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=47-foot_Motor_Lifeboat&oldid=411251473"