Wasp-Class (Amphibious Assault Ship)

The Wasp class is a class of Landing Helicopter Dock (LHD) amphibious assault ships operated by the United States Navy. Based on the Tarawa class, with modifications to operate more advanced aircraft and landing craft, the Wasp class is capable of transporting almost the full strength of a United States Marine Corps Marine Expeditionary Unit (MEU), and landing them in hostile territory via landing craft or helicopters. All Wasp-class ships were built by Ingalls Shipbuilding, at Pascagoula, Mississippi, with lead ship USS Wasp commissioned on 29 July 1989. Eight Wasp-class ships were built, and as of 2013, all eight are active.

Name: Wasp
Builders: Ingalls Shipbuilding
Operators: United States Navy
Preceded by: Tarawa-class amphibious assault ship
Succeeded by: America-class amphibious assault ship
Cost: $750 million each, average
In commission: 1989–present
Completed: 8
Active: 8
General characteristics
Type: Landing Helicopter Dock (LHD) amphibious assault ship
Displacement: 40,500 long tons (41,150 t) full load
Length: 831 ft (253.2 m)
Beam: 104 ft (31.8 m)
Draft: 27 ft (8.1 m)
Propulsion: Two boilers, two geared steam turbines, two shafts, 70,000 shaft-horsepower;
two General Electric LM2500 geared gas turbines, two shafts (USS Makin Island)
Speed: 22 knots (41 km/h; 25 mph)
Range: 9,500 nautical miles (17,600 km; 10,900 mi) at 18 kn (33 km/h; 21 mph)
Boats & landing
craft carried:
3 Landing Craft Air Cushion or
12 Landing Craft Mechanized
Troops: 1,894 Marine Detachment
Complement: 1,208
Armament: Two Rolling Airframe Missile launchers
Two Sea Sparrow missile launchers
Three 20 mm Phalanx CIWS systems (LHD 5–7 with two)
Four .50 BMG machine guns
Four 25 mm Mk 38 chain guns (LHD 5–7 with three)
Aircraft carried: Actual mix depends upon the mission
Standard Complement:
6 AV-8B Harrier II attack aircraft
4 AH-1W SuperCobra attack helicopter
12 CH-46 Sea Knight helicopters or 4+MV-22 Osprey
4 CH-53 Sea Stallion helicopters
3–4 UH-1N Huey helicopters
Assault:
42 CH-46 Sea Knight helicopters
or
22+ MV-22 Osprey
Sea Control:
20 AV-8B Harrier II attack aircraft
6 SH-60F/HH-60H ASW helicopters

Design

The Wasp class is based on the preceding Tarawa-class design. The design was modified to allow for the operation of AV-8B Harrier II aircraft and Landing Craft Air Cushion (LCAC) hovercraft, making the Wasp class the first ships specifically designed to operate these. The main physical changes between the two designs are the lower placement of the ship's bridge aboard the Wasps, the relocation of the command and control facilities to inside the hull, the removal of the 5-inch Mk 45 naval guns and their sponsons on the forward edge of the flight deck, and a lengthening of 24 feet (7.3 m) to carry the LCACs.

Each Wasp class ship has a displacement of 40,500 long tons (41,150 t) at full load, is 831 feet (253.2 m) long, has a beam of 104 feet (31.8 m), and a draft of 27 feet (8.1 m). For propulsion, most of the ships are fitted with two steam boilers connected to geared turbines, which deliver 70,000 shaft horsepower (33,849 kW) to the two propeller shafts. This allows the LHDs to reach speeds of 22 knots (41 km/h; 25 mph), with a range of 9,500 nautical miles (17,600 km; 10,900 mi) at 18 knots (33 km/h; 21 mph). The last ship of the class, USS Makin Island, was instead fitted with two General Electric LM2500 geared gas turbines. The ship's company consists of 1,208 personnel. The ships are the largest amphibious warfare vessels in the world.

Amphibious operations

The LHDs can support amphibious landings in two forms: by landing craft, or by helicopter. In the 266-by-49.9-foot (81-by-15.2 m) well deck, the LHDs can carry three Landing Craft Air Cushion, twelve Landing Craft Mechanized, or 40 Amphibious Assault Vehicles (AAVs), with another 21 AAVs in the vehicle deck. The flight deck has nine helicopter landing spots, and can operate helicopters as large as the Sikorsky CH-53 Sea Stallion and Boeing Vertol CH-46 Sea Knight. The size of the air group varies depending on the operation: a standard air group consists of six Harriers and four Bell AH-1W Super Cobras for attack and support, twelve Sea Knights and four Sea Stallions for transport, and three to four Bell UH-1N Iroquois utility helicopters. For a full assault, the air group can be maxed out at 42 Sea Knights, while a Wasp operating in the sea control or 'harrier carrier' configuration carries 20 Harriers (though some ships of the class have operated as many as 24), supported by six Sikorsky SH-60 Seahawk helicopters for anti-submarine warfare. The CH-46 is being replaced by the MV-22 Osprey on a squadron-by-squadron basis, with expected full conversion within all aviation combat elements by 2019. Two aircraft elevators move aircraft between the flight deck and the hangar; in order to transit the Panama Canal, these elevators need to be folded in.

Ships and homeports

  • USS Wasp (LHD-1), Norfolk, Virginia
  • USS Essex (LHD-2), San Diego, California
  • USS Kearsarge (LHD-3), Norfolk, Virginia
  • USS Boxer (LHD-4), San Diego, California
  • USS Bataan (LHD-5), Norfolk, Virginia
  • USS Bonhomme Richard (LHD-6), Sasebo, Japan
  • USS Iwo Jima (LHD-7), Norfolk, Virginia
  • USS Makin Island (LHD-8), San Diego, California

Source

The information contained on this page is unclassified, approved for public dissemination and is released under CC-BY-SA Licensing Agreement.



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