Tambor-class submarine

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USS Tambor
USS Tambor (SS-198)
Class overview
NameTambor class
BuildersElectric Boat Company, Portsmouth Naval Shipyard, Mare Island Naval Shipyard[1]
Operators United States Navy
Preceded bySargo class[1]
Succeeded byMackerel class[1]
Built1939–1941[2]
In commission1940–1946[2]
Completed12[1]
Lost7[1]
Retired5[1]
General characteristics
Type
Diesel-electric submarine
Displacement
  • 1,475 long tons (1,499 t) standard, surfaced[3]
  • 2,370 long tons (2,410 t) submerged[3]
Length307 ft 2 in (93.62 m)[3]
Beam27 ft 3 in (8.31 m)[3]
Draft14 ft 7+1⁄2 in (4.458 m)[3]
Propulsion
Speed
  • 20.4 knots (38 km/h) surfaced[3]
  • 8.75 knots (16 km/h) submerged[3]
Range11,000 nautical miles (20,000 km) at 10 knots (19 km/h)[3]
Endurance48 hours at 2 knots (3.7 km/h) submerged[3]
Test depth250–300 ft (76–91 m) Crush Depth Possible 500 ft (150 m)[3]
Complement6 officers, 54 enlisted[3]
Armament

The Tambor-class submarine was a

diesel-electric propulsion plant, and improved combat efficiency with key personnel and equipment relocated to the conning tower.[5][6] In some references, the Tambors are called the "T Class", and SS-206 through SS-211 are sometimes called the "Gar class".[7]

Design history

Preliminary designs

Early U.S. submarine designs of World War I assigned to escort shipping revealed that they had minimal ability to deter an aggressive threat. Despite the fact that German U-boats proved beyond a doubt that no navy could be a world sea power without submarines, the role played by U.S. submarines in the defense of the Pacific would have to be rethought by Navy planners.

Following the

Armistice, and after testing the capabilities of German design via captured U-boats, the U.S. Navy began to see the potential for extended offensive submarine operations. Submarine operations with the fleet required boats with a high speed of 21 knots so that they could maneuver with the Standard-type battleships. A high endurance was also desired to enable sustained patrols in Japanese home waters, hopefully providing warning of enemy operations as well as sinking warships close to home.[8] These qualities would later prove vital in commerce raiding during World War II, though this was largely absent from prewar planning due to the restrictions of the Washington Naval Treaty.[9] The huge advancement in American technology required to fill that role with "a new all-purpose fleet submarine" also became apparent.[10]

The first attempt to produce a fleet submarine was the

direct drive main diesels with small diesel-electric diesels to achieve 21 knots. Their engines, built by the Bureau of Steam Engineering (BuEng) based on German MAN designs, were unreliable and the boats had poor seakeeping qualities.[11] They were decommissioned in 1937 and saw only limited service, mostly training and experimental, in World War II
.

A different direction, that of a large, long-range

Makin Island raid but also in the Philippines
.

After the unsuccessful attempts outlined above, Navy designers finally worked towards a practical fleet submarine. The first successful approaches to this were the

double-acting
diesels, which had poor reliability.

Tambor-class proposal

In the fall of 1937 a proposal for an improved fleet submarine was put forward by the team of officers put together by then-Commander

Portsmouth Navy Yard, and Lt. Armand M. Morgan, head of the Navy's submarine design section. It was to be large (1,500 tons), and carry the latest diesel engines, ten torpedo tubes, a 5-inch (127 mm) gun, and an updated Torpedo Data Computer. Habitability would be increased by the addition of fresh water distillation units and air conditioning
.

However, the design concepts faced opposition from Admiral Thomas Hart, Chairman of the General Board. Hart stubbornly defended the building of small, coastal defense boats (without "luxuries" like air conditioning, whose primary function was not comfort but the elimination of prevalent electrical shorts). Through determination and skilled political maneuvering, the design of Lockwood's team prevailed (though Hart would consent to only a 3-inch (76 mm) gun). As with other classes, the small gun was to prevent submarines from attempting to engage heavily armed escorts on the surface. This design was finally adopted by the Navy's General Board and the Submarine Officers' Conference for the 1939 program.

Design specifications

The Tambors had several key improvements over the Sargo class. For the first time in a US submarine, six bow torpedo tubes were equipped. This had been delayed for several years due to an overestimate of the tonnage required for the two extra tubes. The four stern tubes of the Sargos were retained. Larger torpedo rooms eliminated the deck stowage of torpedoes on previous classes, which was abandoned during World War II in any case.[5] Combat efficiency was improved by relocating the sonar operators and the Torpedo Data Computer into an enlarged conning tower to enable direct communication with the captain, and a new periscope with a small head to avoid detection was equipped.[6][13] The "negative tank" or "down express" tank found on some World War I-era S-boats was revived; this could be quickly flooded when diving to provide negative buoyancy and get the submarine under water more quickly. The hull had improved streamlining for a higher cruising speed.[5]

Although the Tambors were initially equipped with a

4-inch (102 mm)/50 caliber guns
removed from old S-boats that were being withdrawn from combat service.

The full diesel-electric propulsion plant found in a few Sargos was continued, and probably improvements over the Porpoise class eliminated the arcing that had plagued those boats. The "new S-class" had boats with either

nuclear submarines, this was one of the best submarine engines ever. The Tambors were lucky; twelve of the subsequent Gato-class boats were initially equipped with HORs, apparently to speed up production.[16]

The Tambors had a significant weakness: all four engines were in one compartment, making the boat very vulnerable to damage. This was corrected in the Gato class, whose test depth was also increased from 250 ft (76 m) to 300 ft (91 m), based on testing of depth charges against Tambor.[17]

Mine armament

The Tambor class could substitute mines in place of torpedoes. For the Mk 10 and Mk 12 type mines used in World War II, each torpedo could be replaced by as many as two mines, giving the submarine a true maximum capacity of 48 mines. However, doctrine was to retain at least four torpedoes on mine laying missions, which would limit the capacity to 40 mines, and this is often stated as the maximum in various publications. In practice during the war, submarines went out with at least 8 torpedoes, and the largest minefields laid were 32 mines. Post-war, the Mk 49 mine replaced the Mk 12, while the larger Mk 27 mine was also carried which only allowed one mine replacing one torpedo.[18]

Service

Periscope photo of a Japanese merchant ship sinking.

Six Tambors were in Hawaiian waters or the Central Pacific on 7 December 1941, with

nuclear weapons tests at Bikini Atoll
in 1946, but was only lightly damaged. She was later expended as a target in 1948.

Submarines in class

Construction data
Name Hull no. Builder Laid down Launched Commissioned Fate
Tambor SS-198
Electric Boat, Groton, Connecticut
 16 January 1939 20 December 1939 3 June 1940 Decommissioned 10 December 1945. Reserve training ship postwar; sold for scrap 1 September 1959.
Tautog SS-199 1 March 1939 27 January 1940 3 July 1940 Decommissioned 8 December 1945. Reserve training ship postwar; sold for scrap 15 November 1959, to the Bultema Dock and Dredge Company of Manistee, Michigan.
Thresher SS-200 27 April 1939 27 March 1940 27 August 1940 Decommissioned 13 December 1945. Sold for scrap 18 March 1948 to Max Siegel of Everett, Massachusetts.
Triton SS-201
Portsmouth Navy Yard, Kittery, Maine
 5 July 1939 25 March 1940 15 August 1940 Lost to attack by three destroyers 20 March 1943.
Trout SS-202 8 August 1939 21 May 1940 15 November 1940 Lost around 29 February 1944, probably to enemy action.
Tuna SS-203
Mare Island Navy Yard, Vallejo, California
 19 July 1939 2 October 1940 2 January 1941 Decommissioned on 11 December 1946. Expended as target 24 September 1948.

The last six of the Tambor class are often listed as "Gar-class" submarines. They were ordered in fiscal year 1940 (FY40); the previous six were ordered in FY39, and some design differences were anticipated. On 17 December 1938, the secretary of the navy decided that the FY40 class would duplicate the FY39 class. However, design collapse depth was increased from 450 feet (140 m) to 500 feet (150 m), with test depth remaining at 250 feet (76 m).[5]

Construction data (Gar-class)
Name Hull no. Builder Laid down Launched Commissioned Fate
Gar SS-206 Electric Boat, Groton, Connecticut 27 December 1939 27 November 1940 14 April 1941 Decommissioned on 11 December 1945. Reserve training ship postwar; sold for scrap 18 November 1959 to Acme Scrap Iron and Metal Company.
Grampus SS-207 14 February 1940 23 December 1940 23 May 1941 Lost 5 March 1943, probably to enemy action.
Grayback SS-208 3 April 1940 31 January 1941 30 June 1941 Lost to enemy action 27 February 1944.
Grayling SS-209 Portsmouth Navy Yard, Kittery, Maine 15 December 1939 29 November 1940 1 March 1941 Lost between 9 and 12 September 1943, to accident or enemy action.
Grenadier SS-210 2 April 1940 29 November 1940 1 May 1941 Scuttled following enemy action April 22, 1943.
Gudgeon SS-211 Mare Island Navy Yard, Vallejo, California 22 November 1939 25 January 1941 21 April 1941 Lost between 7 April and 7 June 1944, to accident or enemy action.

See also

References

Citations

  1. ^
    ISBN 0-313-26202-0
    .
  2. ^
    ISBN 1-55750-263-3
    .
  3. ^ a b c d e f g h i j k l m n o p U.S. Submarines Through 1945 pp. 305-311
  4. ^ a b US submarine deployment 7 December 1941
  5. ^ a b c d Friedman, pp. 204-205
  6. ^ a b Tambor class article at The Pacific War Online Encyclopedia
  7. ^ Silverstone, pp. 190-193
  8. ^ Friedman, pp. 163-165
  9. ^ Friedman, p. 163
  10. ^ Friedman, pp. 99-100
  11. ^ Friedman, pp. 112-113
  12. ^ Friedman, pp. 173-182
  13. ^ Friedman, pp. 196-197
  14. ^ Friedman, pp. 214-218
  15. ^ Friedman, pp. 263, 360-361
  16. ^ Friedman, pp. 360-361
  17. ^ Friedman, pp. 205-206, 310
  18. ^ ORD696 Operational Characteristics of U.S. Naval Mines

Sources

External links

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