The ''Osprey'' class are a series of coastal minehunters designed to find, classify, and destroy moored and bottom

naval mine A naval mine is a self-contained explosive weapon placed in water to damage or destroy surface ships or submarines. Similar to anti-personnel mine, anti-personnel and other land mines, and unlike purpose launched naval depth charges, they are ...

s from vital

waterways A waterway is any navigable body of water. Broad distinctions are useful to avoid ambiguity, and disambiguation will be of varying importance depending on the nuance of the equivalent word in other ways. A first distinction is necessary betw ...

. Their design is based on the second series of the Italian ''Lerici''-class, built in

La Spezia La Spezia (, or ; ; , in the local ) is the capital city of the province of La Spezia and is located at the head of the Gulf of La Spezia in the southern part of the Liguria region of Italy. La Spezia is the second-largest city in the Liguria ...

by Intermarine between 1990 and 1996. Eight vessels were built in the Intermarine shipyard located in Savannah, while the remaining four have been built by a second-source shipyard under a Technology Transfer and Licence Agreement. They use sonar and video systems, cable cutters and a mine detonating device that can be released and detonated by remote control. The ''Osprey'' class are the world's second largest minehunters (surpassed by the

Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...

's s) to be constructed entirely of

fiberglass Fiberglass (American English) or fibreglass (English in the Commonwealth of Nations, Commonwealth English) is a common type of fibre-reinforced plastic, fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened i ...

and designed to survive the shock of underwater explosions. Their primary mission is reconnaissance, classification, and neutralization of all types of moored and bottom mines in littoral areas, harbors and coastal waterways.

Construction

Twelve minehunter ships were built for the

U.S. Navy The United States Navy (USN) is the maritime service branch of the United States Department of Defense. It is the world's most powerful navy with the largest displacement, at 4.5 million tons in 2021. It has the world's largest aircraft ...

by Northrop Grumman Ship Systems (formerly Litton Avondale Industries) of

New Orleans New Orleans (commonly known as NOLA or The Big Easy among other nicknames) is a Consolidated city-county, consolidated city-parish located along the Mississippi River in the U.S. state of Louisiana. With a population of 383,997 at the 2020 ...

and Intermarine of

Savannah A savanna or savannah is a mixed woodland-grassland (i.e. grassy woodland) biome and ecosystem characterised by the trees being sufficiently widely spaced so that the canopy does not close. The open canopy allows sufficient light to reach th ...

. The ships were commissioned between 1993 and 1999. The ships of this class were named after various types of birds. The 12 ships are long, wide, and tall. When carrying a full load they displace . They have four decks, and have a complement of five officers, four chief petty officers, and 42 enlisted men. They are armed with two .50 caliber machine guns. All of the major equipment is suspended from the main deck in glass-reinforced plastic holders, so that in the event of an undersea explosion, it will not be damaged. They use an AN/SLQ-53 deep sweep mine countermeasures system. They also use an AN/SQQ-32 Variable Depth Sonar, which is tethered to the front of the

bridge A bridge is a structure built to Span (engineering), span a physical obstacle (such as a body of water, valley, road, or railway) without blocking the path underneath. It is constructed for the purpose of providing passage over the obstacle, whi ...

, to detect and identify mines using multiple ping processing. Two

AN/UYK-44 The AN/UYK-44 was the standard 16-bit minicomputer of the United States Navy developed in the early 1980s by Sperry Corporation and was completed in early 1984. The AN/UYK-44 was used in surface ships, submarines, ground C4I platforms, radar and ...

computers are also used to classify and detect mines. For surface radar purposes, an AN/SPS-64(V)9 is used. They also use the AN/SLQ-48 mine neutralization system, which is tethered to the ship by a long cable. They have two AN/UYQ-31 operator data terminals, which are identical. They are propelled by two

Isotta Fraschini Isotta Fraschini () is an Italian luxury car manufacturer, also producing trucks, as well as engines for marine and aviation use. Founded in Milan, Italy, in 1900 by Cesare Isotta and the brothers Vincenzo, Antonio, and Oreste Fraschini, in 195 ...

ID 36 SS 8V AM

diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...

s which drive generators feeding two Voith Schneider cycloidal propellers generating . They have a max speed of , and a maximum operational range of .

Decommissioning

All of these ships were decommissioned in 2006–07. The

Hellenic Navy The Hellenic Navy (HN; , abbreviated ΠΝ) is the Navy, naval force of Greece, part of the Hellenic Armed Forces. The modern Greek navy historically hails from the naval forces of various Aegean Islands, which fought in the Greek War of Independ ...

received two of the ''Osprey'' class from the US Navy: , renamed ''Calypso'' and , renamed ''Euniki''. Two more were transferred to the

Egyptian Navy The Egyptian Navy (), also known as the Egyptian Naval Forces, is the maritime branch of the Egyptian Armed Forces. It is the largest navy in the Middle East as well as Africa, and is the twelfth largest (by the number of vessels) navy in the w ...

: , renamed ''al Sedeeq'' (MHC-521) and , renamed ''al Farouk'' (MHC-524). The sale of and to the

Republic of China Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...

was also authorized. The U.S. General Services Administration (GS) announced in April 2014 that hull numbers MHC-51, 54, 56, 57, 58, and 62 were up for auction to be sold as an entire lot for "dismantlement purposes only." This contradicted earlier information announcing the sale of some of these vessels to foreign operators. The minehunting role of this class is to be taken over by

Littoral Combat Ship A littoral combat ship (LCS) is either of two classes of relatively small surface vessels designed for littoral warfare in near-shore operations by the United States Navy. It was "envisioned to be a networked, agile, stealthy surface comba ...

s equipped with the Mine Counter-Measures Module.

Ships

Notes

References

*
Federation of American Scientists: MHC 51 Osprey Coastal Mine Hunters
* 26 Mar 2014 MHC 51, 54, 56, 57 58, 62 are on GSA auction web site for "DISMANTLEMENT" out of Beaumont, TX. http://gsaauctions.gov/gsaauctions/aucindx/

External links