V-boat


The V-boats were a group of nine United States Navy submarines built between World War I and World War II from 1921 to 1934. These were not a ship class in the usual sense of a series of nearly identical ships built from the same design, but shared authorization under the "fleet boat" program. The term "V-boats" as used includes five separate classes of submarines. They broke down into three large, fast fleet submarines, three large long-range submarines, and three medium-sized submarines. The successful fleet submarines of World War II were descended from the last three, especially V-7, though somewhat larger with pure diesel-electric propulsion systems.
Originally called USS V-1 through V-9, in 1931 the nine submarines were renamed,,,,,,,, and, respectively. All served in World War II, six of them on war patrols in the central Pacific. Argonaut was lost to enemy action.

Background

In the early 1910s, only 12 years after inaugurated the Navy's undersea force, naval strategists had already begun to wish for submarines that could operate in closer collaboration with the surface fleet than the Navy's existing classes, which had been designed primarily for coastal defense. These notional "fleet" submarines would necessarily be larger and better armed, but primarily, they would need a surface speed of some to be able to maneuver with the 21-knot battleships the battle fleet was built around. This was the designed speed of the and later battleships, including the standard-type battleships that were under construction and proposed in 1913.
In the summer of 1913, Electric Boat's chief naval architect, former naval constructor Lawrence Y. Spear, proposed two preliminary fleet-boat designs for consideration in the Navy's 1914 program. In the ensuing authorization of eight submarines, Congress specified that one should "be of a seagoing type to have a surface speed of not less than twenty knots". This first fleet boat, laid down in June 1916, was named USS Schley after Spanish–American War hero Winfield Scott Schley. With a displacement of surfaced, submerged, on a length of, Schley was twice as large as any previous U.S. submarine. To achieve the required surface speed, two tandem diesel engines on each shaft drove twin screws, and a separate diesel generator was provided for charging batteries. Although Schley and two sisters authorized in 1915—, and —all made their design speed of, insoluble torsional vibration problems with their tandem engines made them very troublesome ships, and they were decommissioned in 1922-1923 after a service life of only a few years. As the engines were clutched together, it was impossible to perfectly synchronize their operation.
In 1916, well before the T class debacle transpired, Congress authorized 58 coastal submarines and nine additional "fleet" boats. Three of the larger coastal boats eventually became competing prototypes for the long-lived, 51-member S class. The nine "fleet boats" became the "V-boats", built between 1921 and 1934, and in fact, they were the only U.S. submarines produced in that period. However, although V-4, V-5, and V-6 were the largest US non-nuclear submarines ever built, only V-1 through V-3 were designed to reach a speed of 21 knots.

''V-1'' through ''V-3''—the ''Barracuda''s

The first three V-boats were funded in fiscal year 1919, laid down at the Portsmouth Navy Yard in October and November 1921, and commissioned somewhat less than a year apart between 1924 and 1926. Significantly, V-1, V-2, and V-3 were the only members of the class designed to satisfy the Navy's original "fleet boat" requirement for high surface speed. These were large and powerfully engined submarines, displacing surfaced and submerged on a length of. The propulsion plant was divided between two separate engine rooms—forward and aft of the control room—with two main-propulsion direct-drive diesels aft, and two independent diesel generators forward. The latter were primarily for charging batteries, but to reach maximum surface speed, they could augment the mechanically coupled main-propulsion engines by driving the electric motors in parallel. This partial diesel-electric propulsion system foreshadowed the later successful all-diesel-electric submarines, although nearly ten years of development were required before it was reliable. The three boats were partially double-hulled and fitted forward with buoyancy tanks inside a bulbous bow for better surface sea-keeping. They were armed with six 21 inch torpedo tubes, four forward and two aft with 12 torpedoes, plus a 5 inch /51 caliber deck gun. They were the first US submarine class to have aft torpedo tubes, except for four boats of the S-48 sub-class of the S-class with a single aft torpedo tube. Aft torpedo tubes would be a feature of all US submarines, except the minelaying submarine USS Argonaut, until the second Barracuda class which joined the fleet in 1951.
Unfortunately, the first three V-boats had poor operational performance. Designed for on the surface, they only made, and also failed to make their submerged design speed of. As built, they were somewhat too heavy forward, which made them poor sea boats, even after replacing the original deck guns with smaller 3 inch /50 caliber models to save weight in 1928. Moreover, both the main propulsion diesel engines and their original electric motors were notoriously unreliable, and full-power availability was rare. Renamed Barracuda, Bass, and Bonita in 1931, they were decommissioned in 1937, and only the imminence of World War II provided a reprieve, in preparation for which they were recommissioned in September 1940. Just before Pearl Harbor, the three boats were transferred to Coco Solo, Panama Canal Zone, and each made a number of defensive war patrols off the approaches to the Panama Canal.
All three boats were overhauled in Philadelphia, Pennsylvania, in late 1942 and early 1943 and converted to cargo submarines by removing both torpedo tubes and main engines, thereby leaving them solely dependent on their diesel generators for propulsion. Because this rendered the boats severely under-powered, they apparently never served operationally in their cargo-carrying role but instead were relegated to training duties at New London until just before the end of the war in 1945. After decommissioning, Barracuda and Bonita were scrapped, and Bass was scuttled as a sonar target near Block Island, Rhode Island.

''V-4''—''Argonaut''

Displacing submerged, V-4—later —was both the largest submarine the Navy ever built before the advent of nuclear power and the only U.S. submarine specifically designed as a minelayer. Her configuration, and that of the following V-5 and V-6, resulted from an evolving strategic concept that increasingly emphasized the possibility of a naval war with Japan in the far western Pacific. This factor, and the implications of the 1922 Washington Naval Treaty, suggested the need for long-range submarine "cruisers", or "strategic scouts", as well as long-range minelayers, for which long endurance, not high speed, was most important. The design was possibly influenced by the German "U-cruisers" of the Type U-139 and Type U-151 U-boat classes, although V-4, V-5, and V-6 were all larger than these. Funded in fiscal year 1925, laid down at Portsmouth in May of that year, and commissioned in April 1928, V-4 was long overall and carried four 21 inch torpedo tubes forward and two mine-laying chutes and their associated mechanical handling equipment aft. Two 6 inch /53 caliber deck guns were equipped, the largest deck guns ever on a US submarine. Considerable engine room volume was sacrificed to achieve an internal payload of 60 specially designed Mark XI moored mines, and consequently, the main propulsion diesels were limited to a total of, yielding only on the surface.
An over-large, under-powered, and one-of-a-kind submarine, Argonaut was never particularly successful but stayed in commission all through the 1930s. Early in World War II, she was re-engined at Mare Island to increase her main propulsion output to, and additionally received two external stern torpedo tubes and two stern deck stowage tubes. Despite having never laid a mine in anger, her mine-laying gear was stripped out at this time to prepare for conversion to a troop-carrying submarine. Then, at Pearl Harbor, the conversion was completed. In that guise, and accompanied by Nautilus, she participated in the US Marine assault on Japanese-held Makin Atoll by Carlson's Raiders in August 1942. In transferring to Brisbane, Australia late that year, Argonaut was diverted to a war patrol near Bougainville in the northern Solomon Islands, and lost with all hands on 10 January 1943 after attacking a heavily-defended Japanese convoy.

''V-5'' and ''V-6''—''Narwhal'' and ''Nautilus''

In their overall appearance and dimensions, V-5, later Narwhal and V-6, later Nautilus were similar to Argonaut and constituted "submarine cruiser" counterparts at least partially inspired by German success with long-range submarine commerce raiders of the Type U-139 and Type U-151 U-boat classes in World War I. Endurance, sea-keeping, increased torpedo capacity, and large deck guns were emphasized at the cost of high speed; and originally, a small scouting seaplane was to be carried in a water-tight hangar abaft the conning tower. The Navy had experimented with seaplanes on submarines with a prototype hangar installation on during the mid-1920s. However, the resulting increase in scouting capability was significantly offset by several additional dangers to the host submarine, and the initiative was dropped.
The two double-hulled boats displaced on the surface and submerged on a length of. They displayed prominent "surface-ship" characteristics, notably high freeboard and an expansive deck structure. Each was powered by two 10-cylinder, two-stroke, MAN diesel engines. They also had a pair of smaller diesel-powered generators for charging batteries or augmenting the main propulsion engines on the surface. On trials, the two boats achieved nearly surfaced and submerged, and their claimed endurance was at. In addition to the customary torpedo tubes—four forward and two aft with 24 torpedoes —they carried two 6 inch /53 caliber deck guns, the largest ever mounted on U.S. submarines.
Funded in 1926 and commissioned in 1930, V-5 and V-6 emerged as too large and unwieldy for fully successful operation: slow to dive, hard to maneuver, and easy to detect. Nonetheless, as Narwhal and Nautilus, they served usefully in the 1930s, and just before World War II Nautilus was modified to carry of aviation gasoline for refueling seaplanes at sea. Early in the war, each was re-fitted with four General Motors diesels and four additional external torpedo tubes, and despite their age and inherent design flaws, they went on to compile enviable war records.
Narwhal completed 15 successful war patrols and Nautilus 14, and between them, they are credited with sinking 13 enemy ships for a total of 35,000 tons. Somewhat more serendipitously, their large size made them useful for carrying both troops and cargo on covert missions. Thus, Nautilus joined with Argonaut in transporting Carlson's Raiders to Makin Aoll, and then with Narwhal, landed a strong detachment of the US Army's Alaskan Scouts on Attu in the Aleutian Islands, preparatory to the main landing that regained that island from the Japanese in May 1943. For the final two years of the war, the two boats were devoted almost exclusively to clandestine insertion and retrieval operations behind enemy lines, particularly in preparation for the U.S. campaign to retake the Philippines.
With the end of the war in sight, Narwhal and Nautilus were withdrawn from service in April and June 1945, respectively, and sold for breaking up soon thereafter. Narwhal′s 6 inch guns are retained as a memorial at the Naval Submarine Base New London, Connecticut.

''V-7''—''Dolphin''

The penultimate design in the V-boat series was laid down at Portsmouth in June 1930 and emerged as two years later. With a length of and a displacement only a little more than half that of her three predecessors, Dolphin was clearly an attempt to strike a happy medium between those latter ships and earlier S-class submarines, which were little more than large coastal boats. The general arrangement of propulsion machinery was identical to that of V-5 and V-6, but even with a surface displacement of only 1,718 tons, Dolphin′s scaled-down main engines—rated at each—could only just deliver the surface speed of the larger ships, and her endurance and torpedo load-out were much reduced. The torpedo armament was six 21 inch tubes, with 18 torpedoes. A 4 inch /50 caliber deck gun was equipped. Dolphin's size and weight were nearly ideal for the range and duration of the war patrols that became customary in the Pacific during World War II, and the war-time Gato, Balao, and Tench classes had similar dimensions.
Early in the war, Dolphin made three patrols from Pearl Harbor without notable distinction, and her deteriorating material condition soon restricted her to training duties, first in Hawaii, and then at New London, Connecticut, for the duration of the war. She was decommissioned in October 1945 and sold for scrapping a year later.

''V-8'' and ''V-9''—''Cachalot'' and ''Cuttlefish''

Even before V-5 and V-6 had been completed and V-7 laid down, submarine officer opinion had begun to shift in favor of smaller boats similar to Germany's 1,200-ton design from World War I. Then, when the London Naval Treaty of 1930 for the first time imposed international limits on total submarine tonnage, the incentive to build smaller ships became especially compelling. The restrictions of the London Naval Treaty were a factor in the disposal in 1930 of T-1, T-2, and T-3, which had been laid up for nearly a decade. By special agreement, Argonaut, Narwhal, and Nautilus were exempted from the treaty limitations.
An extensive study was conducted to determine the optimum submarine size under the treaty restrictions, factoring in total force, endurance, and percentage of the force that could be maintained on station far from a base, as in a Pacific war scenario. The result was the two smallest V-boats, Cachalot and Cuttlefish, funded in fiscal year 1932. At overall and only surface displacement, Cachalot and Cuttlefish were even smaller than the T-boats of 15 years earlier. The engineering plant consisted of two innovative, compact Maschinenfabrik Augsburg-Nürnberg -designed, BuEng-built main diesels, supposedly capable of delivering each, plus a single diesel generator rated at. Although the boats approached on trials, the new MAN engines failed repeatedly from excessive vibration and were replaced in 1938 by General Motors diesels with reduction gearing. The armament was similar to Dolphin: six 21 inch torpedo tubes, with 16 torpedoes. A 3 inch /50 caliber deck gun was equipped, a decrease in gun caliber that would persist through early World War II. In the 1930s it was felt that a larger gun would encourage submarine captains to fight on the surface against superior anti-submarine ships, but eventually war experience showed that a larger gun was needed.
The Navy assigned Cuttlefish to the Electric Boat Company, the first submarine contract award to a private yard since the last of the S-class in 1918. Accordingly, Cuttlefish differed from her Portsmouth-built sister, Cachalot, in many respects, including more spacious internal arrangements, the first installation of air conditioning on a U.S. submarine, and the first partial use of welding in hull fabrication. Moreover, Cachalot and Cuttlefish served as the first test beds for the Mark I Torpedo Data Computer that revolutionized underwater fire control in the mid-1930s.
Unfortunately, because small size severely limited their speed, endurance, and weapons load, neither boat was successful under the conditions of the Pacific War. Each did three scoreless war patrols in the central and western Pacific, and Cachalot did one in Alaskan waters, but by late 1942, it was clear both were out-classed and worn out, and they finished the war at New London as training ships. The two were decommissioned in October 1945 and broken up several years later.

Conclusion

By 21st century standards, the Navy's exploitation of the Congressional "fleet boat" authorization of 1916 to build five vastly different submarine designs in a series that ended only in 1934 may seem surprising or even disingenuous. However, as the only U.S. submarines built during an entire decade of shifting and often-contradictory operational concepts, the nine V-boats could hardly have been expected to be homogeneous. However, the relative freedom that the Navy was granted to try so many novel submarine approaches in so few years may only have been matched subsequently in the initial era of the nuclear propulsion program. Three distinct concepts were pursued: large fast submarines, large long-range submarines, and medium-sized "fleet boat" prototypes. The leap to true "fleet boats" from the last three only required improved diesel engines. Except for Narwhal and Nautilus—used to ferry Marine Raiders, spies, and saboteurs— none of the V-boats achieved significant success either in peacetime or under combat conditions in World War II. But the willingness to experiment that produced the V-boats in all their variety paid off in a host of lessons that were applied to the subsequent succession of true "fleet boat" designs—the
Porpoise,,,, and classes.

Submarines

In 1920, the Navy adopted a hull number scheme that distinguished between coastal and general purpose boats, designated "SS"; and fleet boats, designated "SF." Accordingly, T-1 through T-3 were originally designated SF-1 through SF-3, and V-1 through V-7 were designated SF-4 through SF-10. The system was changed to designate V-boats as "SC" before V-8 and V-9 were ordered. In 1931 all received names, and all except V-4 were redesignated in the "SS" series. V-4 was also designated SM-1 at one time, as a "submarine mine-layer".
Ship name and hull no. as orderedShip name and hull no. in 1931BuilderLaid DownLaunchedCommissionedDecommissionedFate
V-1 Portsmouth Naval Shipyard20 October 192117 July 19241 October 19243 March 1945Scrapped 1945
V-2 Portsmouth Naval Shipyard20 October 192127 December 192426 September 19253 March 1945Scuttled 1945
V-3 Portsmouth Naval Shipyard16 November 19219 June 192522 May 19263 March 1945Scrapped 1945
V-4 Portsmouth Naval Shipyard1 May 192510 November 19272 April 192810 January 1943Lost to enemy action 10 January 1943
V-5 Portsmouth Naval Shipyard10 May 192717 December 192815 May 193023 April 1945Scrapped 1945
V-6 Mare Island Naval Shipyard2 August 192715 March 19301 July 193030 June 1945Scrapped 1945
V-7 Portsmouth Naval Shipyard14 June 19308 March 19321 June 19322 October 1945Scrapped 1946
V-8 Portsmouth Naval Shipyard21 October 193119 October 19331 December 193317 October 1945Scrapped 1947
V-9 Electric Boat Company7 October 193121 November 19338 June 193424 October 1945Scrapped 1947