The ''Lapwing''-class minesweeper, often called the Bird class, was an early "AM-type" oceangoing

minesweeper A minesweeper is a small warship designed to remove or detonate naval mines. Using various mechanisms intended to counter the threat posed by naval mines, minesweepers keep waterways clear for safe shipping. History The earliest known usage of ...

of the

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

. Seven ships of the class were commissioned during

World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...

, and served well into the 1950s. A number were refitted to serve as ocean-going tugs, salvage vessels,

seaplane tender A seaplane tender is a boat or ship that supports the operation of seaplanes. Some of these vessels, known as seaplane carriers, could not only carry seaplanes but also provided all the facilities needed for their operation; these ships are rega ...

s, or

submarine rescue ship A submarine rescue ship is a surface support ship for submarine rescue and deep-sea salvage operations. Methods employed include the McCann Rescue Chamber, deep-submergence rescue vehicles (DSRV's) and diving operations. List of active subm ...

s. The propulsion system consisted of 2 Babcock & Wilcox 200psi boilers and a 1,400shp

Harlan and Hollingsworth Harlan & Hollingsworth was a Wilmington, Delaware, firm that constructed ships and railroad cars during the 19th century and into the 20th century. Founding Mahlon Betts, a carpenter, arrived in Wilmington in 1812. After helping construct many ...

triple expansion reciprocating steam engine.

Ships

The table makes no distinction between classification as "Minesweeper No. X" and "AM-X". This change affected all boats equally ca. 1920. All boats reclassified as Fleet Tugs (AT) where later again reclassified as Fleet Tug, Old (ATO) (ca. 1944). The table treats them the same. Brant and Grebe were never reclassified as ATO.

References

External links

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USN Ships

{{WWII US ships Mine warfare vessel classes