Type C3 ship

The Type C3 ship were the third type of cargo ship designed by the United States Maritime Commission in the late 1930s. As it had done with the Type C1 ships and Type C2 ships, MARCOM circulated preliminary plans for comment. The design presented was not specific to any service or trade route, but was a general purpose ship that could be modified for specific uses. A total of 162 C3 ships were built from 1939 to 1946, with an additional 75 ships built with C3 hulls and engines, but not built as cargo ships.
During World War II, many C3 ships were converted to naval uses, particularly as s, and as and s, Klondike-class destroyer tenders, submarine tenders, and seaplane tenders.

Design

The C3 was larger and faster than the C1 and C2 contemporaries, measuring from stem to stern, and designed to make . Like the C2, it had five cargo holds.

Ships in type

Type	Total	DWT	Builders	Example
C3	12 4	12,595		Elizabeth C. Stanton-class
C-3 P&C C3-A P&C	5 1	10,000	Newport News, VA
C3-E	8	9,514
C3 P&C		10,000
C3-S-A1		12,595		s
C3-S-A2		12,595		Bayfield-class Aegir-class
C3-S-A3		7,336
C3-S-A4		11,000
C3-S-A5	7	11,800
C3-S-BH1	5	11,800
C3-S-BH2	6	11,800
C3-S-DX1	1	10,500		SS Schuyler Otis Bland
C3-S1-A3	2	12,595
C3-S1-BR1	3	9,900		SS Del Norte

C3 Mod. DWT 12,430, as in

C3 multiple or unverified sub-types

* Klondike-class

* President Jackson-class

* Windsor-class

* Kenneth Whiting-class

World War II designs

* The original C3 type, powered by steam turbines, were built at Federal, Ingalls and Moore; 12 ships were built.

* Four more C3 type, powered by diesel engines, were built at Sun at the request of the United States Maritime Commission to compare similar vessels powered by steam turbines, but would be operated by the Moore-McCormack Lines. The propulsion system was four 7-cylinder SCSA diesel engines, rated at total, driving a single screw through electro-magnetic couplings and single reduction gearing. During World War II, all four ships were acquired by the US Navy, with one ship later given to the Royal Navy.

C3-E — 8 vessels were built at Bethlehem Sparrows Point Shipyard. The C3-E type was based on a private design of the American Export Line, using the C3 hull but had a different stern and was equipped with loading gear for heavy cargo.

C3 P&C

* Delta-Type Mississippi Shipping Company

* Six ships of C3 P&C type and one ship of the C3-A P&C type, intended for commercial service with American President Lines, were laid down at Newport News Shipbuilding between October 1939 and December 1940. The Maritime Commission acquired them all for military service before they were completed, but only five were initially handed to the Navy and designated President Jackson-class transports with "AP" hull numbers. These five vessels were all later converted into attack transports and correspondingly reclassified with "APA" hull numbers.

* Sun Shipbuilding

* Ingalls Shipbuilding

C3-S-A1

C3-S-A2

C3-S-A3

C3-S-A4 — 6 vessels were built to a modified design for service with the American President Lines.

C3-S-A5 7 ships were built for the Moore-McCormack Lines.

C3-S-BH1 — 6 vessels were built for Lykes Lines. They were based on the basic C3 design, but incorporated lessons learned during wartime, as well as slight structural modifications and major internal changes.

C3-S-BH2 — 6 vessels were built specifically for American South African Line.

C3-S-DX1 — Only the prototype was built.

C3-S1-A3 — Two ships were delivered to the US Army Transportation Service as transport ships, but after several months of service in this role they were acquired by the US Navy and reclassified as the.

C3-S1-BR1 — Three ships were combined passenger-cargo cruise ships built for Delta Lines. Designed by naval architect George G. Sharp of New York, they were based on the C3 hull with a custom design. They were built at Ingalls Shipyard in Pascagoula, Mississippi at $7,000,000 each and completed in 1946 and 1947 with new commercial radar. Delta Line had two departures per month from Gulf of Mexico ports to the Caribbean and South America. Passenger cruise service ended in 1967 and the ships were converted to cargo. In 1975 the three were scrapped in Indonesia.

Post WWII designs

Warship conversions

Long Island-class escort carriers

Two Sun Ship C3 ships were converted to s. Mormacmail renamed and Mormacland renamed both were converted to escort carriers, at a top speed of.

Bogue-class escort carriers

Amphibious warfare ship conversions

3
4
2
9
34
7
Auxiliary ship conversions

Delta-class repair ship

Amphion-class repair ship

Griffin-class submarine tender

Submarine tender Euryale

Aegir-class submarine tender

,,,

Seaplane tender Tangier, Pocomoke and Chandeleur

Kenneth Whiting-class seaplane tender

Type C3 specifications

Ship type	C3	C3	C3-E	C3-M
Length overall
Beam
Depth
Draft
Deadweight, tons	12,438	11,928	9,660	12,115
Displacement, tons	5,212	5,689	4,983	5,484
Speed
Power

Production

Ingalls Shipbuilding, MS: 80
Seattle-Tacoma Shipbuilding Corporation, WA: 43
Western Pipe and Steel Company, CA: 43
Bethlehem Sparrows Point Shipyard, MD: 21
Federal Shipbuilding and Drydock Company, NJ: 19
Newport News Shipbuilding and Drydock Company, Newport News, Virginia: 10
Bethlehem Fore River, MA: 8
Sun Shipbuilding & Drydock Co., PA: 8
Moore Dry Dock Company, CA: 4
Tampa Shipbuilding Company, FL: 2
Notable incidents
a C3-E, was torpedoed and sank off the coast of Madagascar on 30 June 1942.
a C3, renamed Empire Condor was torpedoed and sank off coast of Tunisia on 13 August 1942.
Rio Hudson a C3-P&C, rebuilt and converted to Avenger-class escort carrier. Was renamed was torpedoed and sank near Gibraltar on 15 November 1942.
USN CVE-21, a C3-S-A1, was torpedoed and sank near the Azores-Canary Islands on 29 May 1944.
Rio de Janeiro a C3-P&C, Avenger-class escort carrier, renamed, exploded and sank in the Lower Clyde in Scotland in 1943.
The SS Jacob Luckenbach, originally Sea Robbin, sank on 14 July 1953 after a collision off San Francisco in fog with another C3 ship, the SS Hawaiian Pilot. Both ships were built at Ingalls and were only five hull numbers apart. The wreck was determined in 2002 to be a source of oil pollution and about 85,000 gallons of oil were removed.
The USNS Card was attacked on 2 May 1964, while moored dockside in Saigon, a North Vietnamese frogman, Lam Son Nao, planted an explosive charge that blew a hole in the hull, killing five crewmen.