Type UB I submarine

In the earliest stages of the First World War the German Army's rapid advance along the North Sea coast found the German Imperial Navy without submarines suitable to operate in the narrow and shallow seas off Flanders.Miller, pp. 46–47.Karau, p. 48. By 18 August 1914, two weeks after the German invasion of Belgium, the planning of a series of small coastal submarines had already begun.

The German Imperial Navy stipulated that the submarines must be transportable by rail, which imposed a maximum diameter of {{convert|3.15|m|ftin}}. The rushed planning effort—which had been assigned the name "Project 34"—resulted in the Type UB I design, created specifically for operation from Flanders. The boats were to be about {{convert|28|m|ft}} long and to displace about {{convert|125|t|LT}} with two bow torpedo tubes.A further refinement of the design—replacing the torpedo tubes with mine chutes but changing little else—led to the Type UC I coastal minelaying submarine. Miller, p. 458.

Boats of the Type UB I design were built by two manufacturers, Germaniawerft of Kiel and AG Weser of Bremen,Williamson, p. 12. which led to some variations in boats from the two shipyards. The eight Germaniawerft-built boats at {{convert|28.10|m|ftin}} length overall, were {{convert|22|cm}} longer than twelve Weser-built boats. All were {{convert|3.15|m|ftin}} abeam and had a draft of {{convert|3.03|m|ftin}}. The boats all displaced {{convert|127|t|LT}} while surfaced, but differed slightly in displacement submerged. The slightly longer Germaniawerft boats displaced {{convert|142|t|LT}} while submerged, as they weighed {{convert|1|t|LT}} more than the Weser boats.

The drivetrain of the boats consisted of a single propeller shaft driven by a Daimler (Germaniawerft) or Körting (Weser) diesel engine on the surface, or a Siemens-Schuckert electric motor for underwater travel. The Weser boats were capable of nearly {{convert|7.5|kn}} on the surface and a little more than {{convert|6|kn}} submerged. The Germaniawerft boats were about {{convert|1|kn}} slower than their Bremen-made counterparts. The boats were equipped with two {{convert|45|cm|in|1|adj=on}} bow torpedo tubes and carried just two torpedoes. They were also armed with a single {{convert|8|mm|in|abbr=on|adj=on}} machine gun affixed to the deck. None of the Type UB I boats had a deck gun.

The German Imperial Navy ordered its first fifteen Type UB I boats on 15 October 1914. Eight boats—numbered UB-1 to UB-8—were ordered from Germaniawerft of Kiel, and seven boats—numbered UB-9 to U-15—from AG Weser of Bremen. After two of the class, UB-1 and UB-15, were sold in February 1915 to ally Austria-Hungary (becoming U-10 and U-11 in the Austro-Hungarian Navy),Gardiner, p. 341. the German Imperial Navy ordered UB-16 and UB-17 from Weser. A further three for Austria-Hungary —U-15, U-16, and U-17—had been ordered from Weser by April, bringing the total number constructed to 20.In the Austro-Hungarian Navy, the Type UB I boats were known as the U-10 class.

UB-1 and UB-2 were laid down on 1 November 1914 at the Germaniawerft yard at Kiel.Tarrant, p. 160.{{cite Uboat.net

|name=UB 1

|id=UB+1

|type=1sub

|access-date=2 March 2009

}}{{cite Uboat.net

|name=UB 2

|id=UB+2

|type=1sub

|access-date=2 March 2009

}} UB-1 was launched on 22 January 1915,Tarrant, p. 163. just 75 working days later. UB-2{{'}}s launch followed on 13 February. Among the Weser boats, UB-9 was laid down first, on 6 November 1914, and launched on 6 February 1915,{{cite Uboat.net

|name=UB 9

|id=UB+9

|type=1sub

|access-date=2 March 2009

}} a week ahead of UB-2. These first three boats launched underwent trials in home waters, but most of the other members of the class were shipped via rail and underwent trials at their assembly point.Karau, p. 49.

The process of shipping the submarines by rail involved breaking the submarines down into what was essentially a knock down kit. Each boat was broken into approximately fifteen pieces and loaded onto eight railway flatcars. Type UB I boats destined for service with the Flanders Flotilla ({{lang|de|U-boote des Marinekorps U-Flottille Flandern}}) made a five-day journey to Antwerp for the two- to three-week assembly process. After assembly at Antwerp the boats were towed by barge to Bruges for trials. Boats selected for service in the Mediterranean were sent to the Austro-Hungarian port of Pola for assembly.Messimer, pp. 126–27.Gibson and Prendergast, p. 71. The total time from departure of the railcars from the shipyard to operational readiness for the boats was about six weeks.

By July 1915 all seventeen of the German Imperial Navy Type UB Is had been completed.Tarrant, p. 16.

During their trials the Type UB Is were found to be too small and too slowMiller, p. 48. and had a reputation for being underpowered;Gibson and Prendergast, pp. 38–39. one commander compared his Type UB I to a "sewing machine". According to authors R. H. Gibson and Maurice Prendergast in their 1931 book The German Submarine War, 1914–1918, the UBs did not have enough power to chase down steamers while surfaced and lacked the endurance to spend any extended amount of time underwater, exhausting their batteries after little over an hour's running. In-service use revealed another problem: with a single propeller shaft/engine combination, if either component failed, the U-boat was almost totally disabled.Miller, p. 48.{{efn|Many of the problems with the Type UB I design were rectified in the larger Type UB II which had twin propellers, larger engines, and a higher top speed. Williamson, p. 13.}}

Another reported problem with the Type UB Is was the tendency to break trim after the firing of torpedoes. The boats were equipped with compensating tanks designed to flood and offset the loss of the C/06 torpedo's {{convert|1700|lb|kg|adj=on}} weight, but this system did not always function properly;Stern, p. 25. as a result, when firing from periscope depth the boat could broach after firing or, if too much weight was taken on, plunge to the depths. When UB-15 torpedoed and sank {{ship|Italian submarine|Medusa|1911|2|up=yes}} in June 1915,Sokol, p. 109 the tank failed to properly compensate, forcing the entire crew to run to the stern to offset the trim imbalance.

Despite the problems, the "tin tadpoles", as the Germans referred to them, were in active service from March 1915 through the end of the war,Tarrant, pp. 23, 34, 56, 74–75. with half of the 20 boats lost during the war. Boats of the class served in three navies: the German Imperial Navy, the Austro-Hungarian Navy, and the Bulgarian Navy. In German service, they served primarily in the Flanders Flotilla, the Baltic Flotilla, and the Constantinople Flotilla.

The first Type UB I to enter service was UB-10, which formed the nucleus of the Flanders Flotilla, on 27 March 1915.{{cite Uboat.net

|name=UB 10

|id=UB+10

|type=1sub

|access-date=2 March 2009

}} By the end of April five more Type UB I boats had become operational.Tarrant, p. 16. UB-10 was eventually joined in the Flanders Flotilla by UB-2, UB-4, UB-5, UB-6, UB-12, UB-13, UB-16, and UB-17;Tarrant, p. 23. of these, only UB-2 made the journey to Flanders by sea rather than rail.

UB-4 departed on the first patrol from Flanders on 9 April,Karau, p. 50. and was responsible for sinking the first ship sent down by the flotilla.{{cite Uboat.net

|name=UB 4

|id=UB+4

|type=1sub

|access-date=2 March 2009

}} The Type UB I boats of the Flanders Flotilla originally patrolled the area between the United Kingdom and the Netherlands, but began patrolling the English Channel after UB-6 pioneered a route past British antisubmarine nets and mines in the Straits of Dover in late June.Karau, p. 51.

Over the Type UB Is' first year of service, UB-4 and UB-13 were both lost,Messimer, pp. 129, 134. and UB-2 and UB-5 were transferred to the Baltic Flotilla.Tarrant, p. 34. In March 1917, UB-6 ran aground in Dutch waters and was interned for the rest of the war, along with her crew.Messimer, p. 132.Gibson and Prendergast, p. 332.{{efn|UB-6 entered Dutch territorial waters due to a navigational error, and ran aground. Because the Netherlands was neutral during the war, and UB-6 did not leave Dutch territorial waters within 24 hours as required by international law, the submarine and her crew were interned by the Dutch. Germany protested, but because UB-6's grounding was the result of an error and not because of distress, the Dutch could not release the submarine.{{cn|date=January 2024}} }} The four remaining Type UB Is in Flanders—UB-10, UB-12, UB-16, UB-17—were all converted to minelayers by 1918, having their torpedo tubes removed and replaced with chutes to carry up to eight mines. All but UB-10 were lost in 1918;Messimer, pp. 133, 135–6. UB-10, in poor repair and out of service, was scuttled in October 1918 when the Germans evacuated from Flanders.Messimer, p. 132.

UB-9 was initially assigned to the Baltic Flotilla,({{lang|de|U-boote der Ostseetreitkräfte V. U-Halbflottille}}) and was joined by UB-2 and UB-5 in early 1916. All three became training boats at Kiel in 1916, joining UB-11 in that duty.Gibson and Prendergast, p. 63. Little information is available about the Type UB I boats operating in the Baltic.

{{Main|Constantinople Flotilla}}

Four of the German Imperial Navy boats—UB-3, UB-7, UB-8, and UB-14—were selected for service with the Constantinople Flotilla. ({{lang|de|U-boote der Mittelmeer Division in Konstantinopel}}) All were sent to Pola for assembly and trials there as part of the Pola Flotilla({{lang|de|Deutsche U-Halbflottille Pola}}) before sailing on to join the Constantinople Flotilla. UB-3 disappeared en route to Constantinople in May 1915, but the other three arrived there by mid-June.

The three Type UB I boats of the Constantinople Flotilla seem to have patrolled primarily in the Black Sea. UB-8 was transferred to the Bulgarian Navy in May 1916,{{cite Uboat.net

|name=UB 8

|id=UB+8

|type=1sub

|access-date=2 March 2009

}} and UB-7 disappeared in the Black Sea in October 1916,Messimer, p. 131. leaving UB-14 as the sole remaining German Type UB I in the flotilla;Tarrant, pp. 74–75. she was surrendered at Sevastopol in November 1918 to French armies stationed there during the Russian Civil War.{{cite Uboat.net

|name=UB 14

|id=UB+14

|type=1sub

|access-date=2 March 2009

}}

{{Main|U-10 class submarine}}

UB-1 and the still incomplete UB-15 were sold to the Austria-Hungary in February 1915; both were dismantled and shipped to Pola in May.Imperial and Royal Navy Association, p. 12. After one cruise under the German flag, each boat was commissioned into the Austro-Hungarian Navy. The pair—renamed U-10 and U-11, respectively—were joined by U-15, U-16, and U-17 in October. Known as the U-10 or the Okarina (Ocarina) class as a part of the Austro-Hungarian Navy,Baumgartner and Sieche, as excerpted [http://www.gwpda.org/naval/ahsubs.htm here] (reprinted and translated into English by Sieche). Retrieved 2 March 2009. the five boats operated primarily in the Adriatic in patrols off Italy and Albania.Imperial and Royal Navy Association, pp. 13–17. U-10 (ex UB-1) hit a mine in July 1918 and was beached, but had not been repaired by the end of the war. U-16 was sunk after she torpedoed an Italian destroyer in October 1916, and the remaining three (and the unrepaired U-10) were ceded to Italy at the end of the war.

{{Main|SM UB-8}}

After UB-8 was transferred to the Bulgarian Navy in May 1916, she was renamed Podvodnik No. 18 (in Cyrillic: Подводник No. 18). She was Bulgaria's first submarine, and was engaged primarily in coastal defense duties off Bulgaria's main Black Sea port of Varna. Podvodnik No. 18 survived the war and was ceded to France after the Treaty of Neuilly-sur-Seine.

Twenty Type UB I submarines were built, 17 for the German Imperial Navy and three for the Austro-Hungarian Navy. Two of the German submarines—UB-1 and UB-15—were sold to Austria-Hungary and commissioned into the Austro-Hungarian Navy as U-10 and U-11, respectively. Those two and a further three built by AG Weser comprised the virtually identical U-10 class for the Austro-Hungarian Navy. Another of the German submarines, UB-8, was sold to Bulgaria in May 1916, becoming Podvodnik No. 18.Йорданов, pp. 130–145.

• {{SMU|UB-1}} (became the Austro-Hungarian U-10, July 1915)
• {{SMU|UB-2}}
• {{SMU|UB-3}}
• {{SMU|UB-4}}
• {{SMU|UB-5}}
• {{SMU|UB-6}}
• {{SMU|UB-7}}
• {{SMU|UB-8}} (became the Bulgarian Podvodnik No. 18, May 1916)
• {{SMU|UB-9}}
• {{SMU|UB-10}}
• {{SMU|UB-11}}
• {{SMU|UB-12}}
• {{SMU|UB-13}}
• {{SMU|UB-14}}
• {{SMU|UB-15}} (became the Austro-Hungarian U-11, June 1915)
• {{SMU|UB-16}}
• {{SMU|UB-17}}

{{Main|U-10 class submarine}}

In the Austro-Hungarian Navy the Type UB I boats were known as the U-10 class, which consisted of two former German Type UB I boats and three built specifically for Austria-Hungary.

• {{SMU|U-10|Austria-Hungary|2}} (the former German UB-1)
• {{SMU|U-11|Austria-Hungary|2}} (the former German UB-15)
• {{SMU|U-15|Austria-Hungary|2}}
• {{SMU|U-16|Austria-Hungary|2}}
• {{SMU|U-17|Austria-Hungary|2}}

In addition, four Type UB Is (assigned to the Pola Flotilla based at the Austro-Hungarian Navy's main naval base at Pola were assigned Austro-Hungarian designations.Gardiner, p. 341.{{efn|After Italy had entered the First World War by declaring war on Austria-Hungary on 23 May 1915, Germany felt treaty-bound to support the Austro-Hungarians in attacks against Italian ships, even though Germany and Italy were not officially at war. As a result, German U-boats operating in Mediterranean were assigned Austro-Hungarian numbers and flags. After 28 August 1916, when Germany and Italy were officially at war, the practice continued, primarily to avoid charges of flag misuse. The practice was largely ended by 1 October 1916 except for a few large U-boats that continued using Austro-Hungarian numbers. Gardiner, p. 341. }}. These were {{SMU|UB-3}} (as U-9), {{SMU|UB-7}} (as U-7), {{SMU|UB-8}} (as U-8), {{SMU|UB-14}} (as U-26).{{efn|Sometimes cited as U-26 in the Austro-Hungarian Navy but she was never officially transferred to the Austro-Hungarian Navy from the German Imperial Navy.Sokol, p. 109.}} These four boats remained under commission in the German Imperial Navy, retained German crews and commanders, and received orders from the German flotilla commander at Pola.

Germany and Bulgaria negotiated the purchase of two UB I boats for the Bulgarian Navy, {{SMU|UB-7||2}} and {{SMU|UB-8||2}}, in 1916. Two crews of Bulgarian sailors were sent to Kiel for training. Before the purchase could be completed, UB-7 was sunk, leaving only one boat for Bulgaria. On 25 May 1916, UB-8 was officially transferred to Bulgaria for the remainder of the war and renamed Podvodnik No. 18.

{{notelist}}

{{Reflist|group=Note}}

{{Reflist|colwidth=30em}}

{{Refbegin}}

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}}

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• {{cite book | editor-last=Gardiner | editor-first=Robert |title=Conway's All the World's Fighting Ships 1906–1921 | location=Annapolis, Maryland | publisher=Naval Institute Press | year=1985 | isbn=978-0-87021-907-8 | oclc=12119866 }}
• {{Gibson}}
• {{cite web | author=Imperial and Royal Navy Association | title=Tengeralattjárók | url=http://www.kriegsmarine.hu/hk/tengeralattjarok.pdf | language=hu | publisher=Imperial and Royal Navy Association | access-date=2 March 2009 | archive-date=11 October 2021 | archive-url=https://web.archive.org/web/20211011040051/http://www.kriegsmarine.hu/hk/tengeralattjarok.pdf | url-status=dead }}
• {{cite book | last=Йорданов | first=Николай | title=Първата българска подводница ("The First Bulgarian Submarine") | publisher=Военно-исторически сборник | location=София | year=1999 | volume=кн. 3 | pages=130–145 | language=bg }}
• {{cite book| last=Jung| first=Dieter| title=Die Kaiserliche Marine 1914-1918 und ihr Verbleib| year=2004| publisher=Bernard & Graefe|isbn=3-7637-6247-7}}
• {{cite book | last=Karau | first=Mark D. |title=Wielding the Dagger: the MarineKorps Flandern and the German War Effort, 1914–1918 | location=Westport, Connecticut | publisher=Praeger Publishing | year=2003 | isbn=978-0-313-32475-8 | oclc=51204317 }}
• {{cite book | last=Messimer | first=Dwight R. |title=Verschollen: World War I U-boat losses | location=Annapolis, Maryland | publisher=Naval Institute Press | year=2002 | isbn=978-1-55750-475-3 | oclc=231973419 }}
• {{cite book | last=Miller | first=David | title=The Illustrated Directory of Submarines of the World | location=St. Paul, Minnesota | publisher=MBI Pub. Co | year=2002 | isbn=978-0-7603-1345-9 | oclc=50208951 }}
• {{Cite book |last=Sokol|first=Anthony|title=The Imperial and Royal Austro-Hungarian Navy|year=1968|location=Annapolis|publisher=United States Naval Institute|oclc=1912}}
• {{cite book | last=Stern | first=Robert Cecil |title=The Hunter Hunted: Submarine versus Submarine: Encounters from World War I to the Present | location=Annapolis, Maryland | publisher=Naval Institute Press | year=2007 | isbn=978-1-59114-379-6 | oclc=123127537 }}
• {{cite book | last=Tarrant | first=V. E. |title=The U-Boat Offensive: 1914–1945 | location=Annapolis, Maryland | publisher=Naval Institute Press | year=1989 | isbn=978-0-87021-764-7 | oclc=20338385 }}
• {{cite book | last=Williamson | first=Gordon|author-link=Gordon Williamson (writer)|title=U-boats of the Kaiser's Navy | location=Oxford | publisher=Osprey | year=2002 | isbn=978-1-84176-362-0 | oclc=48627495 }}

{{Refend}}

{{German Type UB I submarines}}

{{WWI German ships}}

{{DEFAULTSORT:German Type Ub I Submarine}}

01

Type UB I

Type UB I

Category:1914 introductions

Category:1914 in Germany