The ''Balao'' class is a design of
United States Navy
The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...
submarine
A submarine (often shortened to sub) is a watercraft capable of independent operation underwater. (It differs from a submersible, which has more limited underwater capability.) The term "submarine" is also sometimes used historically or infor ...
that was used during
World War II
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, and with 120
boats completed, the largest class of submarines in the United States Navy. An improvement on the earlier , the boats had slight internal differences. The most significant improvement was the use of thicker, higher
yield strength
In materials science and engineering, the yield point is the point on a stress–strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior. Below the yield point, a material will deform elastically and w ...
steel in the
pressure hull
A submarine hull has two major components, the ''superstructure'' and the ''pressure hull''. The external portion of a submarine’s hull—that part that does not resist sea pressure and is free-flooding—is known as the “superstructure” i ...
skins and frames, which increased their
test depth to . A Balao class submarine, the
USS Tang' actually achieved a depth of during a test dive,
and exceeded that test depth when taking on water in the forward torpedo room while evading a destroyer.
Design
The ''Balao''s were similar to the ''Gato''s, except they were modified to increase test depth from to . In late 1941, two of the Navy's leading submarine designers, Captain
Andrew McKee and Commander Armand Morgan, met to explore increasing diving depth in a redesigned ''Gato''. A switch to a new
High-Tensile Steel (HTS) alloy, combined with an increase in hull thickness from to , would result in a test depth of and a collapse depth of . However, the limited capacity of the trim pump at deep depths, and lack of time to design a new pump, caused Rear Admiral E. L. Cochrane, Chief of the
Bureau of Ships
The United States Navy's Bureau of Ships (BuShips) was established by Congress on 20 June 1940, by a law which consolidated the functions of the Bureau of Construction and Repair (BuC&R) and the Bureau of Engineering (BuEng). The new bureau was ...
, to limit test depth to . Fortunately, in 1944 a redesigned Gould centrifugal pump replaced the noisy early-war pump, and effective diving depth was increased.
The ''Balao''s incorporated the
fairwater,
conning tower
A conning tower is a raised platform on a ship or submarine, often armoured, from which an officer in charge can conn (nautical), conn (conduct or control) the vessel, controlling movements of the ship by giving orders to those responsible for t ...
and periscope shears reduction efforts that were being retrofitted to the ''Gato''s and the preceding classes in the original design, refining the reductions and reducing the sail to the smallest practical size. By the time the boats began to be launched, lessons learned from patrol reports had been worked into the design and the bridge and sail proved to be efficiently laid out, well equipped, and well liked by the crews.
[''A Visual Guide to the U.S. Fleet Submarines Part Three: Balao and Tench Classes 1942–1950''](_blank)
pp. 2-3, Johnston, David (2012) PigBoats.COM
For the masts and periscope shears, the original arrangement for both the Government and Electric Boat designs had (forward to aft) the two tapered cone shaped periscope support shears, followed by a thin mast for the SJ surface search radar, and then by a thin mast for the SD air search radar. There were minor differences in how the periscopes were braced against vibration, but both designs were nearly identical. About halfway through their production run, Electric Boat altered their design, moving the SJ radar mast forward of the periscopes, then altered it again a few boats later by enlarging the SD radar mast. Late in the war, many ''Balao''s built with the original design had the SD air search radar moved slightly aft onto a thickened and taller mast. These mast arrangements, along with the tremendous variation in the gun layout as the war progressed account for the numerous exterior detail differences among the boats, to the point that at any given time no two ''Balao''s looked exactly alike.
Engines
The propulsion of the ''Balao''-class submarines was generally similar to that of the preceding ''Gato''-class. Like their predecessors, they were true
diesel-electric submarines: their four
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 powered
electrical generator
In electricity generation, a generator, also called an ''electric generator'', ''electrical generator'', and ''electromagnetic generator'' is an electromechanical device that converts mechanical energy to electrical energy for use in an extern ...
s, and
electric motor
An electric motor is a machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a electromagnetic coil, wire winding to gene ...
s drove the shafts. There was no direct connection between the main engines and the shafts.

''Balao''-class submarines received main engines from one of two manufacturers.
General Motors
General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. The company is most known for owning and manufacturing f ...
Cleveland Model 16-278A V-type diesels or
Fairbanks-Morse
Fairbanks, Morse and Company was an American manufacturing company in the late 19th and early 20th century. Founded in 1823 as a manufacturer of weighing scale, weighing scales, it later diversified into pumps, engines, windmills, coffee grinder ...
38D 8-1/8 nine-cylinder
opposed-piston engine
An opposed-piston engine is a piston engine in which each cylinder (engine), cylinder has a piston at both ends, and no cylinder head. Petrol and diesel opposed-piston engines have been used mostly in large applications such as ships, military ...
. The
General Motors
General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. The company is most known for owning and manufacturing f ...
Cleveland Model 16-248 V-type as original installations, while boats from onward received 10-cylinder engines. Earlier General Motors boats received Model 16-248 engines, but beginning with Model 16-278A engines were used. In each case, the newer engines had greater
displacement
Displacement may refer to:
Physical sciences
Mathematics and physics
*Displacement (geometry), is the difference between the final and initial position of a point trajectory (for instance, the center of mass of a moving object). The actual path ...
than the old, but were rated at the same power; they operated at lower
mean effective pressure
The mean effective pressure (MEP) is a quantity relating to the operation of a reciprocating engine and is a measure of an engine's capacity to do work that is independent of engine displacement. Despite having the dimension of pressure, MEP cann ...
for greater reliability.
Both the Fairbanks-Morse and General Motors engines were
two-stroke cycle
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft in contrast to a four-stroke engine which re ...
types.
Two submarines, and , were to receive
Hooven-Owens-Rentschler (H.O.R.) diesels, which proved unreliable on previous classes, but both boats were cancelled.
Two manufacturers supplied electric motors for the ''Balao'' class.
Elliott Company motors were fitted primarily to boats with Fairbanks-Morse engines.
General Electric
General Electric Company (GE) was an American Multinational corporation, multinational Conglomerate (company), conglomerate founded in 1892, incorporated in the New York (state), state of New York and headquartered in Boston.
Over the year ...
motors were fitted primarily to boats with General Motors engines, but some Fairbanks-Morse boats received General Electric motors.
Allis-Chalmers
Allis-Chalmers was a United States, U.S. manufacturer of machinery for various Industry (economics), industries. Its business lines included list of agricultural machinery, agricultural equipment, heavy equipment, construction equipment, electric ...
motors were to be used in SS-530 through SS-536, but those seven boats were cancelled before even receiving names.
Earlier submarines carried four high-speed
electric motor
An electric motor is a machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a electromagnetic coil, wire winding to gene ...
s (two per shaft), which had to be fitted with reduction gears to slow their outputs down to an appropriate speed for the shafts. This reduction gearing was very noisy, and made the submarine easier to detect with
hydrophone
A hydrophone () is a microphone designed for underwater use, for recording or listening to underwater sound. Most hydrophones contains a piezoelectric transducer that generates an electric potential when subjected to a pressure change, such as a ...
s. Eighteen late ''Balao''-class submarines received low-speed double
armature motors which drove the shafts directly and were much quieter, but this improvement was not universally fitted until the succeeding . The new
direct drive
A direct-drive mechanism is a mechanism design where the force or torque from a prime mover is transmitted directly to the effector device (such as the drive wheels of a vehicle) without involving any intermediate couplings such as a gear train ...
electric motors were designed by the
Bureau of Ships
The United States Navy's Bureau of Ships (BuShips) was established by Congress on 20 June 1940, by a law which consolidated the functions of the Bureau of Construction and Repair (BuC&R) and the Bureau of Engineering (BuEng). The new bureau was ...
' electrical division under Captain
Hyman G. Rickover, and were first equipped on . On all US World War II-built boats, as the diesel engines were not directly connected to the shafts, the electric motors drove the shafts all the time.
Deck guns

Many targets in the
Pacific War
The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the Theater (warfare), theatre of World War II fought between the Empire of Japan and the Allies of World War II, Allies in East Asia, East and Southeast As ...
were
sampan
A sampan is a relatively flat-bottomed wooden boat found in East, Southeast, and South Asia. It is possibly of Chinese or Austronesian origin. Some sampans include a small shelter on board and may be used as a permanent habitation on in ...
s or otherwise not worth a torpedo, so the
deck gun
A deck gun is a type of naval artillery mounted on the deck of a submarine. Most submarine deck guns were open, with or without a shield; however, a few larger submarines placed these guns in a turret.
The main deck gun was a dual-purpose w ...
was an important weapon. Early ''Balao''s began their service with a
/50 caliber Mk. 9 gun. Due to war experience, most were re-armed with a
/25 caliber Mk. 17 gun, similar to mounts on battleships and cruisers but built as a "wet" mount with corrosion resistant materials, and with power-operated loading and aiming features removed. This conversion started in late 1943, and some boats had two of these weapons beginning in late 1944. , commissioned in March 1944, was the first newly built submarine with the purpose-built /25 submarine mount. Additional
anti-aircraft
Anti-aircraft warfare (AAW) is the counter to aerial warfare and includes "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It encompasses surface-based, subsurface ( submarine-launched), and air-ba ...
guns included single
40 mm Bofors and twin
20 mm Oerlikon mounts, usually one of each.
Mine armament
Like the previous ''Tambor''/''Gar'' and ''Gato'' classes, the ''Balao'' 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 further limits 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.
Boats in class
This was the most numerous US submarine class; 120 of these boats were commissioned from February 1943 through September 1948, with 12 commissioned postwar. Nine of the 52 US submarines lost in World War II were of this class, along with five lost postwar, including one in Turkish service in 1953, one in Argentine service in the
Falklands War
The Falklands War () was a ten-week undeclared war between Argentina and the United Kingdom in 1982 over two British Overseas Territories, British dependent territories in the South Atlantic: the Falkland Islands and Falkland Islands Dependenci ...
of 1982, and one in Peruvian service in 1988.
[''United States Submarine Losses in World War II'', Naval History Division, Office of the Chief of Naval Operations, Washington: 1963 (Fifth Printing)] Also, flooded and sank while fitting out at the
Boston Naval Shipyard on 15 March 1945. She was raised but not repaired, and was listed with the
reserve fleet
A reserve fleet is a collection of naval vessels of all types that are fully equipped for service but are not currently needed; they are partially or fully Ship decommissioning, decommissioned. A reserve fleet is informally said to be "in mothba ...
postwar until struck in 1958. Some of the class served actively in the US Navy through the middle 1970s, and one (''Hai Pao'' ex-) is still active in Taiwan's
Republic of China Navy
The Republic of China Navy (ROCN, Chinese, 中華民國海軍) , colloquially known as the Taiwanese Navy ( Chinese, 台湾海军) by Western or mainland Chinese media, or commonly referred as the National Military Navy ( Chinese, 國軍海軍) ...
.
SS-361 through SS-364 were initially ordered as ''Balao''-class, and were assigned hull numbers that fall in the middle of the range of numbers for the ''Balao'' class (SS-285 to SS-416 & 425–426). Thus, in some references they are listed with that class. However, they were completed by
Manitowoc as ''Gato''s, due to an unavoidable delay in
Electric Boat
An electric boat is a powered watercraft driven by electric motors, which are powered by either on-board battery packs, solar panels or generators.
While a significant majority of water vessels are powered by diesel engines, with sail power ...
's development of ''Balao''-class drawings. Manitowoc was a follow yard to Electric Boat, and was dependent on them for designs and drawings.
Also, and are listed with the ''Tench'' class in some references, as their hull numbers fall in the range of that class.
Cancellations
A total of 125 U.S. submarines were cancelled during World War II, all but three between 29 July 1944 and 12 August 1945. The exceptions were three ''Tench''-class boats, cancelled 7 January 1946. References vary considerably as to how many of these were ''Balao''s and how many were ''Tench''es. Some references simply assume all submarines numbered after SS-416 were ''Tench'' class; however, and were completed as ''Balao''s. This yields 10 cancelled ''Balao''-class, SS-353-360 and 379–380. The ''Register of Ships of the U. S. Navy'' differs, considering every submarine not specifically ordered as a ''Tench'' to be a ''Balao'', and further projecting SS-551-562 as a future class.
This yields 62 cancelled ''Balao'' class, 51 cancelled ''Tench'' class, and 12 cancelled future class. Two of the cancelled ''Balao''-class submarines, and , were launched incomplete and served for years as experimental hulks at
Annapolis
Annapolis ( ) is the capital of the U.S. state of Maryland. It is the county seat of Anne Arundel County and its only incorporated city. Situated on the Chesapeake Bay at the mouth of the Severn River, south of Baltimore and about east o ...
and
Norfolk, Virginia
Norfolk ( ) is an independent city (United States), independent city in the U.S. state of Virginia. It had a population of 238,005 at the 2020 United States census, 2020 census, making it the List of cities in Virginia, third-most populous city ...
. The cancelled hull numbers, including those launched incomplete, were SS-353–360 (''Balao''), 379–380 (''Balao''), 427–434 (''Balao''), 436–437 (''Tench''), 438–474 (''Balao''), 491–521 (''Tench''), 526–529 (''Tench''), 530–536 (''Balao''), 537–550 (''Tench''), and 551–562 (future).
Service history
World War II

The ''Balao''s began to enter service in mid-1943, as the many problems with the
Mark 14 torpedo
The Mark 14 torpedo was the United States Navy's standard submarine-launched anti-ship torpedo of World War II. This weapon was plagued with many problems which crippled its performance early in the war. It was supplemented by the Mark 18 el ...
were being solved. They were instrumental in the Submarine Force's near-destruction of the
Japanese merchant fleet and significant attrition of the
Imperial Japanese Navy
The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, Potsdam Declaration, when it was dissolved followin ...
. One of the class, , brought down what remains the largest warship sunk by a submarine, the (59,000 tons). , the highest-scoring of the class, sank 33 ships totaling 116,454 tons, as officially revised upward in 1980.
Nine ''Balao''s were lost in World War II, while two US boats were lost in postwar accidents. In foreign service, one in Turkish service was lost in a collision in 1953, one in Peruvian service was lost in a collision in 1988, and was sold to the Argentinian Navy. She was renamed the ARA ''Santa Fe'' (S-21) and was lost in the 1982
Falklands War
The Falklands War () was a ten-week undeclared war between Argentina and the United Kingdom in 1982 over two British Overseas Territories, British dependent territories in the South Atlantic: the Falkland Islands and Falkland Islands Dependenci ...
after being damaged, when she sank while moored pierside. ''Santa Fe'' was refloated and disposed of a few years after the war by being taken out to deep water and scuttled.
Additionally, , commissioned but incomplete and still under construction, flooded and sank pierside at the
Boston Navy Yard
The Boston Navy Yard, originally called the Charlestown Navy Yard and later Boston Naval Shipyard, was one of the oldest shipbuilding facilities in the United States Navy. It was established in 1801 as part of the recent establishment of t ...
on 15 March 1945, after a yard worker mistakenly opened the inner door of an aft
torpedo tube
A torpedo tube is a cylindrical device for launching torpedoes.
There are two main types of torpedo tube: underwater tubes fitted to submarines and some surface ships, and deck-mounted units (also referred to as torpedo launchers) installed aboa ...
that already had the outer door open. No personnel were lost in the accident and she was raised, decommissioned, and never completed or repaired.
Her 42 days in commission is the record for the shortest commissioned service of any USN submarine. Postwar, she was laid up in the
Reserve Fleet
A reserve fleet is a collection of naval vessels of all types that are fully equipped for service but are not currently needed; they are partially or fully Ship decommissioning, decommissioned. A reserve fleet is informally said to be "in mothba ...
until stricken in 1958 and scrapped in 1959.
''Balao'' class losses
Notable submarines
* was second on the list of number of ships sunk with 33 and first on the list of tonnage with 116,454. Her third war patrol was the most successful of any U.S. submarine with 10 ships for 39,100 tons. Sunk in the
Taiwan Strait
The Taiwan Strait is a strait separating the island of Taiwan and the Asian continent. The strait is part of the South China Sea and connects to the East China Sea to the north. The narrowest part is wide.
Names
Former names of the Tai ...
by a circular run of her own torpedo, her skipper
Richard O'Kane and eight others escaped; some escaped the submerged wreck with the only known successful use of the
Momsen Lung. ''Tang''s survivors were imprisoned by the Japanese for the rest of the war. After his release following the Japanese surrender, Richard O'Kane was awarded the
Medal of Honor
The Medal of Honor (MOH) is the United States Armed Forces' highest Awards and decorations of the United States Armed Forces, military decoration and is awarded to recognize American United States Army, soldiers, United States Navy, sailors, Un ...
for his actions commanding ''Tang'' during the convoy battles of 24 and 25 October 1944.
*
''Archerfish'' sank the aircraft carrier
''Shinano''. ''Shinano'' is the largest ship sunk by a submarine. Commander Enright was awarded the
Navy Cross
The Navy Cross is the United States Naval Service's second-highest military decoration awarded for sailors and marines who distinguish themselves for extraordinary heroism in combat with an armed enemy force. The medal is equivalent to the Army ...
.
* ''
Batfish'' is preserved as a museum ship in
Oklahoma
Oklahoma ( ; Choctaw language, Choctaw: , ) is a landlocked U.S. state, state in the South Central United States, South Central region of the United States. It borders Texas to the south and west, Kansas to the north, Missouri to the northea ...
. She is famous for sinking three Japanese submarines, ''
RO-55'',
''RO-112'', and ''
RO-113'' in a 3 day time span. She is the only US submarine to have sunk 3 ships in a 72 hour period. She also sank the destroyer ''
Samidare''.
* ''
Redfish'' participated in the destruction of two Japanese aircraft carriers. On December 9th, she was part of a
submarine wolfpack which damaged the aircraft carrier ''
Junyō'' beyond repair, then just 10 days later she torpedoed and sank the aircraft carrier ''
Unryū''. After the war, ''Redfish'' became something of a movie star, playing the role of
Jules Verne
Jules Gabriel Verne (;''Longman Pronunciation Dictionary''. ; 8 February 1828 – 24 March 1905) was a French novelist, poet and playwright.
His collaboration with the publisher Pierre-Jules Hetzel led to the creation of the ''Voyages extraor ...
's ''Nautilus'' in the
Walt Disney
Walter Elias Disney ( ; December 5, 1901December 15, 1966) was an American animator, film producer, voice actor, and entrepreneur. A pioneer of the Golden age of American animation, American animation industry, he introduced several develop ...
film ''
20,000 Leagues Under the Sea
''Twenty Thousand Leagues Under the Seas'' () is a science fiction adventure novel by the French writer Jules Verne. It is considered a classic within its genres and world literature. It was originally serialised from March 1869 to June 1870 i ...
,'' then played the part of the fictional submarine USS ''Nerka'' in the 1958 motion picture ''
Run Silent, Run Deep''. She capped her film career by making several appearances in the popular black-and-white television series ''The Silent Service''.
* ''
Sealion'' launched a torpedo attack which sank the Japanese battleship ''
Kongō'' and the destroyer ''
Urakaze''.
* ''
Blackfin
Blackfin is a family of 16-/32-bit microprocessors developed, manufactured and marketed by Analog Devices. The processors have built-in, fixed-point digital signal processor (DSP) functionality performed by 16-bit multiply–accumulates (MA ...
'' sank the Japanese destroyer ''
Shigure''. Up to that point, ''Shigure'' was seen as a fortune ship, having survived the entirety of the
Solomon Islands campaign
The Solomon Islands campaign was a major military campaign, campaign of the Pacific War during World War II. The campaign began with the Empire of Japan, Japanese seizure of several areas in the British Solomon Islands and Bougainville Island, B ...
without losing a single man in combat, and in turn served in several naval battles, which included helping to sink the submarine
USS ''Growler'' and being the only Japanese ship of her formation to survive the battles of
Vella Gulf and
Surigao Strait
Surigao Strait (Filipino: ''Kipot ng Surigaw'') is a strait in the southern Philippines, between the Bohol Sea and Leyte Gulf of the Philippine Sea.
Geography
It is located between the regions of Visayas and Mindanao. It lies between northern ...
. Her actions were heavily publicized, and her sinking was a huge blow to Japanese morale.
Postwar service history
Postwar, 55 ''Balao''s were modernized under the Fleet Snorkel and Greater Underwater Propulsion Power (
GUPPY
The Greater Underwater Propulsion Power Program (GUPPY) was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines. (The "Y" in the acronym was added for pronouncea ...
) programs, with some continuing in US service into the early 1970s. The last ''Balao''-class submarine in United States service was , which was decommissioned in June 1975.
[GUPPY and other diesel boat conversions page](_blank)
/ref> Seven were converted to roles as diverse as guided-missile submarines (SSG) and amphibious transport submarines (SSP). 46 were transferred to foreign navies for years of additional service, some into the 1990s, and remains active in Taiwan
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 ...
's Republic of China Navy
The Republic of China Navy (ROCN, Chinese, 中華民國海軍) , colloquially known as the Taiwanese Navy ( Chinese, 台湾海军) by Western or mainland Chinese media, or commonly referred as the National Military Navy ( Chinese, 國軍海軍) ...
as ''Hai Pao''.
Naval Reserve trainer
Interested in maintaining a ready pool of trained reservists
A reservist is a person who is a member of a military reserve force. They are otherwise civilians, and in peacetime have careers outside the military. Reservists usually go for training on an annual basis to refresh their skills. This person ca ...
, the Navy assigned at least 58 submarines from 1946 to 1971 to various coastal and inland ports (even in Great Lakes
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border. The five lakes are Lake Superior, Superior, Lake Michigan, Michigan, Lake Huron, H ...
ports like Cleveland
Cleveland is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located along the southern shore of Lake Erie, it is situated across the Canada–U.S. maritime border and approximately west of the Ohio-Pennsylvania st ...
, Chicago
Chicago is the List of municipalities in Illinois, most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 United States census, 2020 census, it is the List of Unite ...
, and Detroit
Detroit ( , ) is the List of municipalities in Michigan, most populous city in the U.S. state of Michigan. It is situated on the bank of the Detroit River across from Windsor, Ontario. It had a population of 639,111 at the 2020 United State ...
), where they served as training platforms during the Reservists' weekend drills. At least 20 ''Balao''-class boats served in this capacity. In this role, the boats were rendered incapable of diving and had their propellers removed. They were used strictly as pierside trainers. These were in commission but classed as "in service in reserve", thus some were decommissioned and recommissioned on the same day to reflect the change in status.[Friedman since 1945, pp. 228-231]
Foreign service
The large numbers of relatively modern, but surplus U.S. fleet submarines proved to be popular in sales, loans, or leases to allied foreign navies. 46 ''Balao''-class submarines were transferred to foreign navies, some shortly after World War II, others after serving nearly 30 years in the US Navy. These included 17 to Turkey, 2 to Greece, 3 to Italy, 2 to the Netherlands, 5 to Spain, 2 to Venezuela, 4 to Argentina, 5 to Brazil, 2 to Chile, 2 to Peru, 1 to Canada and 1 to Taiwan. One of the Venezuelan boats, ''ARV Carite'' (S-11) formerly USS ''Tilefish'' (SS-307), featured in the 1971 film '' Murphy's War'' with some cosmetic modification.
GUPPY and other conversions
At the end of World War II
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, the US submarine force found itself in an awkward position. The 111 remaining ''Balao''-class submarines, designed to fight an enemy that no longer existed, were obsolete despite the fact they were only one to three years old. The German
German(s) may refer to:
* Germany, the country of the Germans and German things
**Germania (Roman era)
* Germans, citizens of Germany, people of German ancestry, or native speakers of the German language
** For citizenship in Germany, see also Ge ...
Type XXI U-boat
Type XXI submarines were a class of German diesel–electric '' Elektroboot'' (German: "electric boat") submarines designed during the Second World War. One hundred eighteen were completed, with four being combat-ready. During the war only two w ...
, with a large battery capacity, streamlining to maximize underwater speed, and a snorkel, was the submarine of the immediate future. The Greater Underwater Propulsion Power Program
The Greater Underwater Propulsion Power Program (GUPPY) was initiated by the United States Navy after World War II to improve the submerged speed, maneuverability, and endurance of its submarines. (The "Y" in the acronym was added for pronouncea ...
(GUPPY) conversion program was developed to give some ''Balao''- and ''Tench''-class submarines similar capabilities to the Type XXI. When the cost of upgrading numerous submarines to GUPPY standard became apparent, the austere "Fleet Snorkel" conversion was developed to add snorkels and partial streamlining to some boats. A total of 36 ''Balao''-class submarines were converted to one of the GUPPY configurations, with 19 additional boats receiving Fleet Snorkel modifications. Two of the GUPPY boats and six of the Fleet Snorkel boats were converted immediately prior to transfer to a foreign navy. Most of the 47 remaining converted submarines were active into the early 1970s, when many were transferred to foreign navies for further service and others were decommissioned and disposed of.
Although there was some variation in the GUPPY conversion programs, generally the original two Sargo batteries were replaced by four more compact Guppy (GUPPY I and II only) or Sargo II batteries via significant re-utilization of below-deck space, usually including removal of auxiliary diesels. All of these battery designs were of the lead-acid type. This increased the total number of battery cells from 252 to 504; the downside was the compact batteries had to be replaced every 18 months instead of every 5 years. The Sargo II battery was developed as a lower-cost alternative to the expensive Guppy battery. All GUPPYs received a snorkel, with a streamlined sail and bow. Also, the electric motors were upgraded to the direct drive
A direct-drive mechanism is a mechanism design where the force or torque from a prime mover is transmitted directly to the effector device (such as the drive wheels of a vehicle) without involving any intermediate couplings such as a gear train ...
double- armature type, along with modernized electrical and air conditioning systems. All except the austere GUPPY IB conversions for foreign transfer received sonar, fire control
Fire control is the practice of reducing the heat output of a fire, reducing the area over which the fire exists, or suppressing or extinguishing the fire by depriving it of fuel, oxygen, or heat (see fire triangle).
Fire prevention and control ...
, and Electronic Support Measures (ESM) upgrades.[Friedman since 1945, pp. 35-43]
The Fleet Snorkel program was much more austere than the GUPPY modernizations, but is included here as it occurred during the GUPPY era. The GUPPY and Fleet Snorkel programs are listed in chronological order: GUPPY I, GUPPY II, GUPPY IA, Fleet Snorkel, GUPPY IIA, GUPPY IB, and GUPPY III.
GUPPY I
Two ''Tench''-class boats were converted as prototypes for the GUPPY program in 1947. Their configuration lacked a snorkel and was not repeated, so no ''Balaos'' received this conversion.
GUPPY II
This was the first production GUPPY conversion, with most conversions occurring in 1947–49. Thirteen ''Balao''-class boats (, ''Clamagore'', , , , , , , , , , , and ) received GUPPY II upgrades. This was the only production conversion with Guppy batteries.
GUPPY IA
This was developed as a more cost-effective alternative to GUPPY II. Nine ''Balao''-class boats (, , , , , , , , and ) were converted in 1951–52. The less expensive Sargo II battery was introduced, along with other cost-saving measures.
Fleet Snorkel
The Fleet Snorkel program was developed as an austere, cost-effective alternative to full GUPPY conversions, with significantly less improvement in submerged performance. Twenty-three ''Balao''-class boats (, , , , , , , , , , , , , , , , , , , , , , and ) received this upgrade, six immediately prior to foreign transfer. Most Fleet Snorkel conversions occurred 1951–52. Unlike the GUPPY conversions, the original pair of Sargo batteries were not upgraded. Each boat received a streamlined sail with a snorkel, along with upgraded sonar, air conditioning, and ESM. The original bow was left in place, except on three boats (''Piper'', ''Sea Owl'', and ''Sterlet'') that received additional upper bow sonar equipment. A few boats initially retained the 5"/25 deck gun, but this was removed in the early 1950s.
GUPPY IIA
This was generally similar to GUPPY IA, except one of the forward diesel engines was removed to relieve machinery overcrowding. Thirteen ''Balao''-class boats (, ''Diodon'', , , , , , , , , , , and ) received GUPPY IIA upgrades in 1952–54. One of these, ''Diodon'', had previously been upgraded to GUPPY II.
GUPPY IB
This was developed as an austere upgrade for two ''Gato''-class and two ''Balao''-class boats ( and ) prior to transfer to foreign navies in 1953–55. They lacked the sonar and electronics upgrades of other GUPPY conversions.
GUPPY III
Nine submarines, six of them ''Balao''s (''Clamagore'', ''Cobbler'', ''Corporal'', ''Greenfish'', ''Tiru'', and ''Trumpetfish''), were upgraded from GUPPY II to GUPPY III in 1959-63 as part of the Fleet Rehabilitation and Modernization II (FRAM II) program. All except ''Tiru'', the pilot conversion, were lengthened by 15 feet in the forward part of the control room to provide a new sonar space, berthing, electronics space, and storerooms. ''Tiru'' was lengthened only 12.5 feet, and both forward diesel engines were removed. The other GUPPY IIIs retained all four engines. A taller "Northern" sail was included, to allow improved surfaced operations in rough seas; this was also backfitted to some other GUPPYs. The BQG-4 Passive Underwater Fire Control Feasibility Study (PUFFS) sonar system, with its three tall domes topside, was fitted. Additionally, fire control upgrades allowed the Mark 45 nuclear torpedo to be used.
Radar picket
The advent of the ''kamikaze
, officially , were a part of the Japanese Special Attack Units of military aviators who flew suicide attacks for the Empire of Japan against Allied naval vessels in the closing stages of the Pacific campaign of World War II, intending to d ...
'' demonstrated the need for a long range radar umbrella around the fleet. Radar picket
A radar picket is a radar-equipped station, ship, submarine, aircraft, or vehicle used to increase the radar detection range around a nation or military (including naval) force to protect it from surprise attack, typically air attack, or from c ...
destroyers and destroyer escorts were put into service, but they proved vulnerable in this role as they could be attacked as well, leaving the fleet blind. A submarine, though, could dive and escape aerial attack. Four submarines including the ''Balao''-class boat ''Threadfin'' prototyped the concept at the end of World War II but were not used in this role. Ten fleet submarines were converted for this role 1946-53 and redesignated SSR as radar picket submarines. was the only ''Balao''-class SSR. Experiments on the first two SSR submarines under the appropriately named Project Migraine I showed that placement of the radars on the deck was inadequate and that more room was needed for electronics. Thus ''Burrfish'' was given the Migraine II (project SCB 12) conversion, which placed a Combat Information Center
A combat information center (CIC) or action information centre (AIC) is a room in a warship or Airborne early warning and control, AWACS aircraft that functions as a tactical center and provides processed information for command and control of ...
(CIC) in the space formerly occupied as the aft battery room. The after torpedo room was stripped and converted into berthing, and the boat lost two of her forward torpedo tubes to make room for additional berthing and electronics. The radars were raised up off the deck and put on masts, giving them a greater range and hopefully greater reliability.
The SSRs proved only moderately successful, as the radars themselves proved troublesome and somewhat unreliable, and the boats' surface speed was insufficient to protect a fast-moving carrier group. The radars were removed and the boats reverted to general purpose submarines after 1959. ''Burrfish'' was decommissioned in 1956 and, with her radar equipment removed, transferred to Canada as HMCS ''Grilse'' (SS-71) in 1961.
Guided-missile submarine
The Regulus
Regulus is the brightest object in the constellation Leo (constellation), Leo and one of the List of brightest stars, brightest stars in the night sky. It has the Bayer designation designated α Leonis, which is Latinisation of names, ...
nuclear cruise missile
A cruise missile is an unmanned self-propelled guided missile that sustains flight through aerodynamic lift for most of its flight path. Cruise missiles are designed to deliver a large payload over long distances with high precision. Modern cru ...
program of the 1950s provided the US Navy with its first strategic strike capability. It was preceded by experiments with the JB-2 Loon missile, a close derivative of the German
German(s) may refer to:
* Germany, the country of the Germans and German things
**Germania (Roman era)
* Germans, citizens of Germany, people of German ancestry, or native speakers of the German language
** For citizenship in Germany, see also Ge ...
V-1 flying bomb
The V-1 flying bomb ( "Vengeance Weapon 1") was an early cruise missile. Its official Reich Aviation Ministry () name was Fieseler Fi 103 and its suggestive name was (hellhound). It was also known to the Allies as the buzz bomb or doodlebug a ...
, beginning in the last year of World War II
World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. Submarine testing of Loon was performed 1947–53, with and converted in to guided-missile submarines as test platforms in 1947 and 1948 respectively. Initially the missile was carried on the launch rail unprotected, thus the submarine was unable to submerge until after launch. ''Cusk'' was eventually fitted with a watertight hangar for one missile and redesignated as an SSG. Following a brief stint as a cargo submarine, was converted in 1955 to carry two surface-launched Regulus missiles and was redesignated as an SSG, joining the ''Gato''-class in this role. She made strategic deterrent patrols with Regulus until 1964, when the program was discontinued in favor of Polaris
Polaris is a star in the northern circumpolar constellation of Ursa Minor. It is designated α Ursae Minoris (Latinisation of names, Latinized to ''Alpha Ursae Minoris'') and is commonly called the North Star or Pole Star. With an ...
. A number of fleet boats were equipped with Regulus guidance equipment 1953–64, including ''Cusk'' and ''Carbonero'' following the Loon tests.
Transport submarine
and were converted to amphibious transport submarines in 1948 and redesignated as SSPs. Initially, they were equipped with a watertight hangar capable of housing a Landing Vehicle Tracked
The Amphibious Vehicle, Tracked (LVT or AMTRAC) is an amphibious warfare vehicle and Amphibious vehicle, amphibious landing craft, introduced by the United States Navy and United States Marine Corps. (The USN and USMC use ''L'' to designate ...
(LVT), and retained one /25 caliber deck gun for shore bombardment. Both torpedo rooms and one engine room were gutted to provide space for embarked Special Operations Forces
Special forces or special operations forces (SOF) are military units trained to conduct special operations. NATO has defined special operations as "military activities conducted by specially designated, organized, selected, trained and equip ...
(SOF) and their equipment. Snorkels were fitted. Due to the extra personnel, to avoid excessive snorkeling they were equipped with a scrubber and extra oxygen storage. Initially, a squadron of 12 SSPs was considered, capable of landing a reinforced Marine battalion, but only two ''Balao''-class SSPs (out of four overall) were actually converted. ''Perch'' landed British commandos
The Commandos, also known as the British Commandos, were formed during the World War II, Second World War in June 1940, following a request from Winston Churchill, for special forces that could carry out Raid (military), raids against German-occ ...
on one raid in the Korean War
The Korean War (25 June 1950 – 27 July 1953) was an armed conflict on the Korean Peninsula fought between North Korea (Democratic People's Republic of Korea; DPRK) and South Korea (Republic of Korea; ROK) and their allies. North Korea was s ...
, and operated in the Vietnam War
The Vietnam War (1 November 1955 – 30 April 1975) was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam (Democratic Republic of Vietnam) and South Vietnam (Republic of Vietnam) and their allies. North Vietnam w ...
from 1965 until assignment to Naval Reserve training in 1967 and decommissioning in 1971, followed by scrapping in 1973. ''Perch'' was replaced in the Pacific Fleet transport submarine role by in 1967 and in 1968. ''Sealion'' operated in the Atlantic, deploying for the Cuban Missile Crisis
The Cuban Missile Crisis, also known as the October Crisis () in Cuba, or the Caribbean Crisis (), was a 13-day confrontation between the governments of the United States and the Soviet Union, when American deployments of Nuclear weapons d ...
and numerous SOF-related exercises. She was decommissioned in 1970 and expended as a target in 1978. The LVT hangar and gun were removed from both boats by the late 1950s. They went through several changes of designation in their careers: ASSP in 1950, APSS in 1956, and LPSS in 1968.
Sonar test submarine
was redesignated as an auxiliary submarine (AGSS) in 1949 and converted to a sonar test submarine in 1958–59 to test a system known as LORAD. This included a extension aft of the forward torpedo room, with swing-out arrays near the bow. Later, three large domes were installed topside for a wide aperture array.
Cargo submarine
'' Barbero'' was converted to a cargo submarine and redesignated as an SSA in 1948. The forward engine room, after torpedo room, and all reload torpedo racks were gutted to provide cargo space. From October 1948 until March 1950, she took part in an experimental program to evaluate her capabilities as a cargo carrier. Experimentation ended in early 1950, and she was decommissioned into the reserve on 30 June 1950. In 1955, she was converted to a Regulus missile submarine and redesignated as an SSG.
Operational submarines
As of 2007 , a ''Balao''-class submarine, was one of the last two operational submarines in the world built during World War II. The boat was transferred to Taiwan
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 ...
's Republic of China Navy
The Republic of China Navy (ROCN, Chinese, 中華民國海軍) , colloquially known as the Taiwanese Navy ( Chinese, 台湾海军) by Western or mainland Chinese media, or commonly referred as the National Military Navy ( Chinese, 國軍海軍) ...
in the early 1970s. The ''Tench''-class ex- is the other one. They are named ''Hai Pao'' and ''Hai Shih'', respectively, in Taiwanese service.
Museums
Six ''Balao''-class submarines are open to public viewing. They primarily depend on revenue generated by visitors to keep them operational and up to U.S. Navy standards; each boat gets a yearly inspection and a "report card". Some boats, like ''Batfish'' and ''Pampanito'', encourage youth functions and allow a group of volunteers to sleep overnight in the crew's quarters.
Surviving ships
The following is a complete list of ''Balao''-class museum boats:
* at War Memorial Park in Muskogee, Oklahoma
Muskogee () is the 13th-largest city in Oklahoma and is the county seat of Muskogee County, Oklahoma, Muskogee County. Home to Bacone College, it lies approximately southeast of Tulsa, Oklahoma, Tulsa. The population of the city was 36,878 as of ...
* at Independence Seaport Museum in Philadelphia
Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...
* at USS Bowfin Submarine Museum & Park in Honolulu
Honolulu ( ; ) is the List of capitals in the United States, capital and most populous city of the U.S. state of Hawaii, located in the Pacific Ocean. It is the county seat of the Consolidated city-county, consolidated City and County of Honol ...
* at Battleship Cove in Fall River, Massachusetts
Fall River is a city in Bristol County, Massachusetts, United States. Fall River's population was 94,000 at the 2020 United States census, making it the List of municipalities in Massachusetts, tenth-largest city in the state, and the second- ...
* at San Francisco Maritime National Historical Park
The San Francisco Maritime National Historical Park is located in San Francisco, California, United States. The park includes a fleet of historic vessels, a visitor center, a maritime museum, and a library/research facility. Formerly referred to ...
in San Francisco
San Francisco, officially the City and County of San Francisco, is a commercial, Financial District, San Francisco, financial, and Culture of San Francisco, cultural center of Northern California. With a population of 827,526 residents as of ...
* at Arkansas Inland Maritime Museum in North Little Rock, Arkansas
North Little Rock (often abbreviated "NLR") is a city in Pulaski County, Arkansas, United States. Located on the north side of the Arkansas River, it is the Twin cities, twin city of Little Rock, Arkansas, Little Rock. In the late nineteenth ce ...
served as a museum boat at Patriots Point in Charleston, South Carolina
Charleston is the List of municipalities in South Carolina, most populous city in the U.S. state of South Carolina. The city lies just south of the geographical midpoint of South Carolina's coastline on Charleston Harbor, an inlet of the Atla ...
until being closed in 2021 and scrapped two years later. Additionally the is aground in the Hackensack River at the site of the former New Jersey Naval Museum. As of 2022, efforts to find a new home for this vessel have been unsuccessful.
Surviving parts
* USS ''Ling'' (SS-297) at New Jersey Naval Museum in Hackensack, New Jersey
Hackensack is the most populous municipality in and the county seat of Bergen County, New Jersey, Bergen County, in the U.S. state of New Jersey. (Sail)
* USS ''Baya'' (SS-318) at Vallejo Naval and Historical Museum in Vallejo, California
Vallejo ( ; ) is a city in Solano County, California, United States, and the second largest city in the North Bay (San Francisco Bay Area), North Bay region of the San Francisco Bay Area, Bay Area. Located on the shores of San Pablo Bay, the ci ...
(Periscope)
* USS ''Pintado'' (SS-387) at National Museum of the Pacific War in Fredericksburg, Texas
Fredericksburg () is a city in and the county seat of Gillespie County, Texas, United States. As of the 2020 United States census, 2020 Census, this city had a population of 10,875.
Fredericksburg was founded in 1846 and named after Prince Frede ...
(Conning Tower)
* USS ''Parche'' (SS-384) at USS Bowfin Submarine Museum & Park in Honolulu
Honolulu ( ; ) is the List of capitals in the United States, capital and most populous city of the U.S. state of Hawaii, located in the Pacific Ocean. It is the county seat of the Consolidated city-county, consolidated City and County of Honol ...
(Conning Tower)
* USS ''Balao'' (SS-285) at Washington Navy Yard
The Washington Navy Yard (WNY) is a ceremonial and administrative center for the United States Navy, located in the federal national capital city of Washington, D.C. (federal District of Columbia). It is the oldest shore establishment / base of ...
in Washington D.C.
Washington, D.C., formally the District of Columbia and commonly known as Washington or D.C., is the capital city and federal district of the United States. The city is on the Potomac River, across from Virginia, and shares land borders with ...
(Conning Tower)
See also
* List of most successful American submarines in World War II
* List of lost United States submarines
A list is a set of discrete items of information collected and set forth in some format for utility, entertainment, or other purposes. A list may be memorialized in any number of ways, including existing only in the mind of the list-maker, but ...
* Allied submarines in the Pacific War
Allied submarines were used extensively during the Pacific War and were a key contributor to the defeat of the Empire of Japan.
During the war, submarines of the United States Navy were responsible for 56% of Japan's merchant marine losses; ot ...
* List of ship classes of the Second World War
* List of ''Balao''-class Submarines
References
Citations
Bibliography
*
*
*
*
*
* Different pagination than 1977 edition.
External links
On Eternal Patrol
website for lost US subs
A Visual Guide to the U.S. Fleet Submarines Part Five: Balao and Tench Classes 1942-1950
Fleet Type Submarine Training Manual
San Francisco Maritime Museum
* ttp://www.navsource.org/archives/08/04idx.htm Navsource.org fleet submarines photo index page* https://web.archive.org/web/20140322093118/http://www.fleetsubmarine.com/sublist.html
DiGiulian, Tony Navweaps.com later 3"/50 caliber gun
{{DEFAULTSORT:Balao Class Submarine
Submarine classes
Balao class
Balao class
Balao class
Balao class