Ormsby-class attack transport

USS Ormsby (APA-49), lead ship of the Ormsby class
Class overview
NameOrmsby class
BuildersMoore Dry Dock
Operators United States Navy
Preceded byWindsor class
Succeeded byBayfield class
In commission28 June 1943 – 15 March 1946
Completed3
ActiveNone
General characteristics
Class and typeOrmsby-class attack transport
Displacement7,300 tons (lt), 13,910 t. (fl)
Length459 ft 3 in (139.98 m)
Beam63 ft (19 m)
Draft24 ft (7.3 m)
Propulsion1 x General Electric geared drive turbine, 2 x Foster-Wheeler D-type boilers, 1 x propeller, designed shaft horsepower 6,000
Speed16 - 16.5 knots
CapacityTroops: Officer 83-91 Enlisted 1,465-1475 Cargo: 150,000 cu ft, 2,700 tons
Complement42-46 officers, 478 enlisted
Armament2 x 5"/38 caliber dual-purpose gun mounts, 2 x Bofors 40mm gun mounts, 4 x twin 20mm gun, 12 - 18 x 20mm single gun mounts.
NotesMCV hull type C2-S-B1

The Ormsby-class attack transport was a class of US Navy attack transport that saw service in World War II.

Like all attack transports, the purpose of the Ormsbys was to transport troops and their equipment to hostile shores in order to execute amphibious invasions using an array of smaller assault boats integral to the attack transport itself. Like all the attack transports, the Ormsby class was well armed with antiaircraft weaponry to protect itself and its cargo of troops from air attack in the battle zone.

History

The Ormsby class began as a class of Navy transport ships (classification AP). Like many other transports, they were redesignated attack transports (APA) on 1 February 1943, the date on which the Navy formalized its separate classification of transport vessels into ordinary transports and attack transports.

The three ships of the Ormsby class were based on the Maritime Commission's ubiquitous (328 total) Type C2 merchant/auxiliary hull (specifically, the C2-S-B1 type). This was a pre-war merchant ship hull type which had been specifically designed with prospective Naval auxiliary service in mind.

The three ships of the Ormsby class were laid down in rapid succession in July–August 1942 by the Moore Dry Dock Company of Oakland, California, and commissioned within a month of one another in June–July 1943. The period of time from the laying of the keels to commissioning therefore, was about 12 months for each ship - a fairly average timespan for C-Type vessels converted to warships.

Each of the ships was armed with two 5"/38 caliber dual-purpose guns, two Bofors 40mm guns, and from 16 to 22 20mm guns. The 20mm gun would eventually prove to be of limited use against air attack and later attack transport classes were fitted with more 40mm weapons instead. The ships had a good balance of troop and cargo capacity.

In service

The Ormsby-class vessels were deployed exclusively in the Pacific Theatre. The ships saw action from the Gilbert Islands campaign to the final battle against the Japanese at Okinawa. Having earned six battle stars apiece, they were employed after hostilities in redeploying occupation troops to the newly conquered Japanese home islands and to other locations formerly occupied by the Japanese, such as parts of China and Korea. They were then used in Operation Magic Carpet, the giant sealift organized to bring demobilizing American servicemen back home to the United States.

All three ships were decommissioned in March–April 1946, and eventually sold or chartered into commercial service. All three were scrapped in 1969, two of them, coincidentally, after suffering accidents that same year. The three vessels in the class thus enjoyed remarkably parallel careers over the course of a service life spanning approximately 26 years.

References

See the individual DANFS ship entries (APA numbers 49, 50 and 51) in the DANFS Online amphibious ship index.

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