U71 (UE1) class (1916)

Germany: Minelayer subs UE and UE1 class. SM U71 to U-80 1916-33.

The U71 class were also known as the UE1 type ocean-going minelayer submarines () they were built by Dantzig naval yard for U73 and U74 (UE) and all the rest (UE1) at Vulcan NyD in Stettin. They notably varied by powerplant, some having the Körting and other Benz 4-stroke engines, for a modest 10.5 knots surfaced, but a range of 5,800 nautical miles (10,740 km). They were armed with just two torpedo tubes but had two mines tubes to lay 34 mines at the stern, creating by night minefield in all important waterways and trade lanes along the British Isles. The ten U71 class U-Boats suffered losses, with two scuttled and three surviving postwar, one under French service until 1933. #kaiserlichesmarine #ww1 #U71 #germaniawerft #uboat #uboote. Note: In cannot find a single photo of any boat in class.

Right to left:Submarines in Cherbourg: CORNELIE 1913-26, ex-German U-105 (French JEAN AUTRIC, 1917-37), ex-German UB-94 (French T. SCHILLEMANS 1918-35), ex-German U-79 (French VICTOR REVEILLE 1916-33), NIVOSE 1912-21 .Title: German submarines and U-79, UB-94 and U-105 Caption: German submarines and U-79, UB-94 and U-105

Development:

The German Type UE I was a type of ocean-going, single-hull submarine, with saddle tanks. They were built by AG Vulkan in Hamburg (eight) and Kaiserliche Werft Danzig (two). U71 was the lead boat from Vulcan, that had the master blueprint and main contract, but only lacked capacity for the full order, thus Danzig was contracted by a remaining two bpats. The Type UE 1 was designed as a pure minelayer submarine around two minelaying tubes, using a conveyor belt like system to lay mines by the stern. This was different than the system design earlier for the first specialized German minelayer submarines, the UC-I type. These were designed in 1914, launched and completed in 1915 and carried already twelve UC 120 mines in six 100 centimetres (39 in) angles vertical mine shafts.

Since the existing UC I mine-laying submarine were designed only for coastal operations, development of a larger new UE mine-laying submarine type was initiated as early as the end of 1914. This new submarine was intended to have a significantly greater range, weigh between 600 and 700 tons, and carry 34 mines dry and accessible to the crew inside the vessel.

The UC-I minelaying system had its limitations as well, and the Navy wanted to test another proposal for a horizontal mine shaft with converyor belt that could be just added instead on the sides of the pressure hull instead of taking a large space amidship in the submarine. Both technologies, horizontal conveyor belt type and vertical gravity-dropping shafts had their pros and cons and these competing technologies were still used in the interwar and in WW2. Great emphasis was placed on the shortest possible construction time and the readily available but weak, underpowered 450-hp diesel engines were used. They were originally intended as generators for the unfinished battleships Sachsen and Württemberg of the Bayern class. A single-hull design with blisters simplified engineer’s work as well.

Construction

The first four boats were ordered on January 6, 1915, from AG Vulkan Hamburg (U 71 and U 72) and on January 9, 1915, from the Imperial Shipyard Danzig (U 73 and U 74). These were single-hulled boats with saddle tanks (comparable to those of the Type VII from World War II) and a displacement of approximately 800 tons. Two mine-laying tubes were located at the stern. These led into a large mine storage compartment. This shifted the engine room to the center of the boat. Forward of the engine room was the control room, located beneath the conning tower. The forward third of the boat housed crew quarters, with the battery compartment below.

Criticism

Due to their weak diesel engines, the boats were later criticized as very slow and prone to top-heavy handling. This often resulted in them submerging in rough seas. As a result, the crew jokingly and somewhat disparagingly referred to these boats as “problem children.” They were armed with a bow torpedo tube on the port (left) side and a stern torpedo tube on the starboard (right) side. Both tubes were located outside the pressure hull and could therefore only be serviced and loaded when the boat was surfaced. They served only for self-defense. For surface combat, there was an 8.8 cm gun behind the conning tower on the aft deck. Later, some boats were re-equipped with more powerful 10.5 cm guns. They could carry 34 mines and a total of four 50 cm torpedoes. On February 27, 1915, six more boats of this type were ordered from the Vulkan shipyard in Hamburg (U 75 to U 80).

Design of the U71 class:

The new minelaying system on the UE1 enabled to carry 38 mines instead of 12, making for a more comprehensive minefield as these minelaying misions, eve made at the dead of night were made in budy traffic lanes, heavily patrolled notably by RN armed trawlers. In the case of a bad encounter, these were no unarmed, they were still equipped with a single torpedo tube forward and aft, and one 8.8 cm (3.5 in) SK L/30 deck gun. U-72 instead had a 10.5 cm (4.1 in) SK L/45 gun installed in 1917. The lack of any defensive armament apart a machine gun was reported by UC-I captains.

Hull and general design

No Plans found of the U-71/UE I class (yet)

The UE1 type U-Boats were relatively small boats compared to comtemporary oceanic U-Boats of the U-63 to U-81 types, approaching 1000 tonnes for 70 meters. The mission was not the same here. Speed was not required to be blisteringly high, not cruising for weeks but just enough range and capacity to perform their missions from A to B (their designated minefield spot) and back. Displacement was 755 tonnes (743 long tons) surfaced and 832 tonnes (819 long tons) submerged with an overall lenght of 56.8 m (186 ft 4 in) and 46.66 m (153 ft 1 in) for the pressure hull.

They had a beam of 5.9 m (19 ft 4 in) overall and 5 m (16 ft 5 in) for the pressure hull, so 90 cm wide blisters on either side, about only 30% her full lenght amidship. Buoyancy margins were minimal and she dived slowly unlike other Oceanic models. Her overall height was 8.25 m (27 ft 1 in) from keel to persicopes portico, not including her wireless radio masts, and her draught, from waterline to keel was 4.86 m (15 ft 11 in). So not the best shapes for speed as their draught and beam ratio were not as fine as in her contemporaries. They were crewed by four officers and 28 men for a complement of 32, a bit less than other subs of the day.

The pressure hull was composed of 6 separate compartments, with ballast tanks fore and aft and alongside the sides bulges, as well as regular tanks and oil tanks. The pressure hull was narrowing forward on convexes faces in which the single 5 cm caliber torpedo tube was located and aft as well. The two main sections were separated by a concave and convexe bulkheads just below the CT well. Detauls for the torpedo compensating tanks, trimming tank, drinking water tank are unknown. They UE1 class had dive planes that were leaf-shape, with their axis directly below the forward tubes. The bow was rounded, not ship-like, without saw above the nose for net-cutting but still the protective cable running from stem to stern. The was also a an extra lead keel with a few bolts in emergency as well, which met a belly tail up to the aft rudder. The rounded stern overhanged the rudder for a few meters as well. As second aerial rudder over the aft deck tail was also installed as backup. There was a small boat encased under deck.

There was a conning tower placed unusually forward, but of the usual type, surrounding the conning tower, with a small helmsman post and wheel forwards, and the main fairwater encased officer’s and watch post. Behind them was a small hatch down to the command post, plus two more on deck fore and aft, for each of the main forward and aft compartments. They had two periscopes, one attack, larger, and one observation one, thinner. They passed both through the conning towing bell into the pressure hull. The aft compartment housed the two diesels side by side, close to oil fuel tanks and distilled water tanks and below were located the batteries. A small separation led aft to the electric engines room. A last flat bulkhead separated it from the aft torpedo room. There were no torpedoes in reserve and the final bulkhead was narrowing up to the tail. The two shafts were supported by small struts and the rudder was a broad “L” with middle hinge.

Power plant of the U71 class

The U71 class were expedited with reasily available diesels rather than waiting to order and received larger ones. These varied between boats. Some were given Körting-Daimler and other Benz diesels. U71, 72, 75, 76: had the Benz diesels and the U73, 74, 77 – 80: had Körting diesels. In both cases, underwater navigation was helped by the same Siemens Schuckert (SSW) electric motors as seen on other contemporary U-Boats, but smaller in that case, for the same 7.8 to 7.9 knots (14.6 km/h; 9.1 mph) submerged on all boats. The norm was two six-cylinder Benz for 900 horsepower (670 kW) making for a surface top speed of 9.6 knots (17.8 km/h; 11.0 mph). The electric engines provided 10.6 knots (19.6 km/h; 12.2 mph). Other sources gives 10.6 knots (19.6 km/h; 12.2 mph) surfaced, likely for the most powerful U71, 72, 75, 76 which had 900/900 hp six-cylinder, 4-stroke Benz engines for 900 horsepower (670 kW). U73, 74 had 800/800 hp Körting 4-cylinder, 2-stroke engines and U77 to 80 had 900/800 hp engines as an alternative. U73 and U74 best speed was 9.6 knots, U75 and 76 9.9 knots, and U-77 to U-80 9.9 knots.

Range counted on an oil fuel bunkerage of 90 tonnes (src navypedia) for U71, 72 and 75 or 82 tonnes for U73 and U74 versus 115-118t on contemporaries. This made for a range of 7,880 nautical miles at 7 knots for U-74 and U-72 to U-80 or 83 knots underwater at 4 knots, and for U73 and U74, 5480 nautical miles surfaced at 7 knots and 83 nautical miles underwater at 4 knots. The U71 class had the same diving operating depth as the others at 50 meters or 164 feet, in probably more than 2 minutes possibly less with the the crew performing its “prow run”, helping tipping the balance down faster.

Armament

The Type UE 1 had the usual defensive armament now a purely defensive one, with a single torpedo tube forward and aft, with a single reload apparently making for four total. They also had a deck gun aft of the CT, the usual 8.8 cm (3.5 in) SK L/30 deck gun, albeit U-72 received a 10.5 cm (4.1 in) SK L/45 gun in 1917. But the UE1 true, main weapon were those 38 mines placed in two minelaying tubes.

Torpedo Tubes

U71 and sisters were armed with a 50 cm or 19.7 inches tube fore and aft and four G7 torpedoes (entering service in 1913), or possibly surplus older G/6. The Kerosene powered G/6D was considered too “temperamental” for submarine use indeed. The G/6 was developed from 1908 and entered service in 1911. The Royal Navy was slower on this chapter, only introducing the 21″ (53.3 cm) Marks II, II* and II** for submarine use from 1914 onwards. The four 500 mm (19.7 inches) torpedo tubes could be reloaded from above via the larger hatches going through the outer upper hull.

G7 Torpedo

The G7 was designed in 1910 and entered service in 1913. Originally designed for surface ships, but in 1917 it started to be used on U-boats.
Specs: Weight: 3,009 lbs. (1,365 kg), Overall Length: 276 in (7,020 m).
Explosive Charge: 430 lbs. (195 kg) Hexanide warhead
Range/Speed settings: 4,370 yards (4,000 m)/37 knots and 10,170 yards (9,300 m)/27 knots
Power: Decahydronaphthalene (Decalin) Wet-Heater

8.8 cm Schnelladekanone Länge 30 naval deck gun

For the U19 onwards, the classic 3,7 cm or 5cm deck guns were ditched out and as U19 was considered large and stable enough to have a larger gun installed and a single 88mm 27 calibre TK L/30 C/08 deck gun was installed forward. For this the deck was reinforced but no sponsons extensions appeared seemingly on photos.

In 1916, after captains reported this gun still weak, notably to scuttle a boarded ship or engage an armed trawler. They spent way too much time sinking their prey, which called for enemy reinforcements. Thus, all four boats had a second 8,8 cm deck gun installed aft, making two. U19 was the first U-Boat class with two guns, fore and aft. This was repeated for the U23 and U27 classes in wartime. U30 exchanged both guns for a single 10.5 cm/43 TK L/45 C/16 deck gun in 1918. The 8.8 cm became the standard go-to gun for all U-Boats built afterwards, until the U87 class (launched 1916), generally two for oceanic boats, one for minelayers and for later coastal subs. They accounted for many of their preys.

The 8.8 cm SK L/30 gun used the Krupp horizontal sliding block, or “wedge” and the submarine deck version was on either a retractable or fixed pivot mount. The Krupp mount retracted vertically through a hatch, and the Erhardt version folded down onto the ship’s deck. They avoided underwater drag and turbulences. It seems U19 class had the Ubts.L of the second type.
The 8.8 cm SK L/30 was a widely used naval gun on World War I pre-dreadnoughts, cruisers, coastal defence ships, avisos, submarines and torpedo boats in both casemates and turrets as well.
This calibre became so ubiquitous in the German Navy it was still a favourite for WW2 U-Boats as well starting with the Type VII. Read more.

Specs 8.8 cm SK L/30 on Ubts.L mount

Weight: 644 kilograms (1,420 lb)

Overall length: 2.64 meters (8 ft 8 in).
Breech: Krupp horizontal sliding block
Shell: fixed 7 kg (15 lb) cal 88 mm (3.5 in)
Elevation: -10° to +30°
Rate of fire: 15 RPM
Muzzle velocity: 590 m/s (1,900 ft/s)
Maximum firing range: 7,3 km (8,000 yd) at 20° or 10,5 km (11,480 yards) at 30°

10.5 cm SK L/45 naval gun (1916)

In late 1917 U72 traded its 8,8cm deck gun for a single 105mm deck gun with 300 rounds. The crew rose to 31 men less four officers, now with a proper gunnery officer. Built by Meddinghaus, this heavy deck gun was designed specially for deck use, low, with many sensible elements protected from corrosion.

Specs 10.5 cm SK L/45

1,450 kg (3,200 lb), 4.725 m (15 ft 6.0 in), 6.8 mm (0.27 in) wide.
Shell 10.5 cm (4.1 in) 25.5 kg (56 lb) fixed Brass Casing 17.4 kg (38 lb)
Breech: Horizontal sliding-block, MPL C/06: -10° to +30° mount
Rate of fire: 15 RPM
Muzzle velocity 710 m/s (2,300 ft/s)
Effective range 12,700 m (41,700 ft) at 30°

Note: In 1916 for some and 1917 for the remainder, the 8,8 cm/27 TK L/30 C/08 was relocated aft. In its place was fitted a 105/43 TK L/45 C/16 forward. Thus all boats had now two deck guns for surface kills, which was much more efficient and quicker. From early 1918 it seems (for the survivors) the aft 8,8 cm/27 gun was removed to improve stability.

100 mm naval mines

The type is unknown as assumed to be the common moored Hertz horn contact mines used on the later UC series. The UC/200 is not well documented, albeit many were captured by the RN from 1915 onwards. The UC/120 was a round 31.5 inches (80 cm) model, with a Wet gun guncotton charge, 290 lbs. (131 kg) and contact horn using acid lead. In UK classification, Type II. The Type III and IV are understood as variant of the UC/200. Also designed for submarine minelayers of the German Navy the UC/200 was developed as a successor to the UC/120 by mid-1915, intended for the almost vertical mine launchers of UC II and UC III tubes. They could be moored at a depth of up to 20 meters, down to 100 meters. The first model weighted 620 lbs. (281 kg), 34 inches (86 cm) but with a Cast TNT 220 lbs. (100 kg) charge and the Type IV, same mass and size but Wet gun guncotton; 180 lbs. (81.6 kg) charge. Other sources gives 200 kg, mine alone, 281 with the anchor below. A reference for Italian mines for the UC/200 model 1921 gives a charge of 441 lbs. (200 kg) and a 330 foot (100 m) mooring cable.

⚙ UE1 type specifications
Displacement	755 tonnes surfaced, 832 tonnes submerged
Dimensions	56.8 x 5.9 x 4.86 (186 ft 4 in x 19 ft 4 in x 15 ft 11 in)
Propulsion	900/800 hp (670 kW) surfaced, 660 kW (890 hp) submerged, see notes
Speed	10.6 knots surfaced, 7.9 knots submerged
Range	7,880 nmi at 7 kn, 83 nmi at 4 knots.
Armament	2x 50 cm torpedo tubes fwd/aft (4), 8.8 cm SK L/30, 2x 100mm minelaying tubes, 38 mines
Mex depth	50m (160 ft)
Crew	32

Succession: The UE II type

UE II class U118 stranded on Hastings Beach

The UE II class submarine was a successor to the UE1. It is often also referred to as the “Large Minelaying Submarine” instead of ‘Type UE II’. In the spring of 1916, the Submarine Inspectorate of the Imperial Naval Office initiated a series of new submarine developments, including the Type UE II. There were two main reasons for this: The proven Type UC II was considered too small in terms of range and mine-laying capacity for many tasks, and the Type UE I had significant shortcomings in terms of seaworthiness and speed. Furthermore, it proved to be very prone to breakdowns.

The design of the double-hulled submarine was primarily based on the fleet submarines Ms-Type U 115 and U 116. Almost the entire bow section was adopted unchanged. At the stern, the pressure hull had to be shaped elliptically to accommodate the large mine storage compartment. As with the Type UE I, the mines were ejected from the storage compartment to the rear through two ejection tubes. Pressure-resistant stowage boxes in the deck could carry either 30 additional mines or 10 torpedoes. Furthermore, the boats were armed with four bow torpedo tubes and a 15.0 cm gun (with the exception of U 123, which instead received two 10.5 cm UToF guns). On May 27, 1916, an order was placed for ten units: U 117 to U 121 with A.G. Vulkan Hamburg, and U 122 to U 126 with Blohm & Voss.

Career of the U71 class

U71 (1916)

The sinking of HMS Ulleswater

U71 was from Vulcan shipyard, Hamburg (Werk 55), ordered of 6 Jan 1915, launched on 31 Oct 1915, and commissioned on 20 Dec 1915. Her first Commander from 20 Dec 1915 to 19 Apr 1917 was Kptlt. Hugo Schmidt. Theb from 20 Apr to 27 November under Kptlt. Walter Gude and until 27 January 1918 Kptlt. Otto Dröscher, then until 29 July 1918 by Oblt. Richard Scheurlen and between July and October 1918 under Oblt. Kurt Slevogt for 12 patrols all within the Ist Flotilla. Her minefields in the Shetland Isles, Loch Ewe, North Minch, off Butt of Lewis, Broad Bay, off Firth of Forth and Firth of Lorne, Toey I, Baltic, and Dutch coast. She claimed 18 ships (15,273 tons) with these or torpedo attacks, damaged one (3,230 tons) and took one 82t as prize. She also sank three warships (2,731 tons total): HMT Thomas Stratten (309t), the destroyer leader HMS Scott, and M class destroyer HMS Ulleswater, and damaged another, 820 tons HMS Shirley. She surrended on V-Day at Harwich. On 23 Feb 1919 she was allocated to France by the allied commission but not recommissioned. Instead she was broken up at Cherbourg in 1921. One of the most successful in class.

U72 (1916)

U72 was laid down at Vulcan, Hamburg (Werk 56) was ordered 6 January 1915, launched on 31 Oct 1915 and commissioned on 26 January 1916 under command of Kptlt. Ernst Krafft until 17 Jul 1917, then until 5 November Kptlt. Johannes Feldkirchner, until 31 December Oblt. (R) Erich Schulze and from 1st January 1918 to her scuttling at Cattaro on 31 October 1918 by Oblt. (R) Hermann Bohm. In all she performed four patrols. Between 11 April and 17 September 1916she remained in the I Flotilla but until 1st Nov. 1918 shew as transferred to the Pola/Mittelmeer II Flotilla. In total she claimed 21 ships for 38,596 tons, damaged five (21,513 tons). As for the details, they will come in a future update.

U73 (1916)

U73 was laid down at Kaiserliche Werft, Danzig (Werk 29) when ordered on 6 January 1915, launched on 16 June 1915 and commissioned 9 Oct 1915 under command of Kptlt. Gustav Sieß (awarded the blue max or Pour le Mérite) until 21 May 1917. Next between 22 May 1917 and 15 January 1918 she operated under Kptlt. Ernst von Voigt and until 15 June 1918 under Kptlt. Karl Meusel, then until 15 September under Oblt. Carl Bünte, her last captain until 30 Oct. 1918 was Kptlt. Fritz Saupe. She only made 2 patrols from 30 April 1916 to 30 Oct. 1918 in the Pola/Mittelmeer II Flotilla, sinking 18 ships for 86,849 tons, damaging three for 8,067 tons and even sank 28,750 tons of warships to boot, HMS Nasturtium (1,250t) flower class sloop, HMS Russell (14,000t a Duncan class battleship), the sloop HMY Aegusa (1,242t), the armed trawler HMT Crownsin (137t) and HMS Clacton making her the most successful in class. Like her sister U72 she was scuttled at Pola to avoid capture.

U74 (1916)

U74 in Barcelona

U74 was laid down at Kaiserliche Werft, Danzig (Werk 30), ordered on 6 January 1915, launched on 10 Aug 1915 and commissioned on 24 Nov 1915 first under Kptlt. Erwin Weisbach until 17 May
Career in the Ist Flotilla making 2 patrols, sinking the 2,802 tons steamer Sabbia. On 17 May she experienced a mine handling accident fatal to her hull, but details are foggy since ther was no survivor. It happened 3.5 miles off Dunbar, Scotland. Her wreck was located by divers. All hands lost.

U75 (1916)

U75 was ordered at Vulcan, Hamburg (Werk 57) on 9 March 1915, laid down and launched on 30 January 1916, and commissioned on 26 March 1916. Until 1st May 1917 she wa sunder command of Kptlt. Curt Beitzen and until 13 Dec. 1917 under Kptlt. Fritz Schmolling, making 7 patrols under the I Flotilla. She sank 11 ships for a total of 18,347 tons, damaged three (7,742 tons), took the 1,700 tons Swedish “Reserv” as prize, and sank the 10,850 tons armmoured cruiser HMS Hampshire. She also sank the HMD Laurel Crown (81t), HMT John High (228t) and 1125t Russian warship Kovda. On 13 December 1917 she Struck a british mine off Terschelling and sank while surfaced, trapping 23 men. Those on deck jumped off board and survived. There were 9 survivors.

U76 (1916)

U76 was ordered from Vulcan, Hamburg as Werk 58 on 9 March 1915, launched on 12 March 1916 and commissioned on 11 May 1916. Until 22 January 1917 when lost her sole commander was Kptlt. Waldemar Bender, making 3 patrols with the I Flotilla. He only sank two ships (Russian and Norwegian) for 1,149 tons, but damaged the 6,254 tons passenger line Koursk. On 22 January 1917 U76 Foundered in bad weather, off North Cape after severe damage by a collision with a Russian trawler causing one dead, the remainder likely survived.

U77 (1916)

U77 was ordered from Vulcan, Hamburg (Werk 59) on 9 Mar 1915, laid down and launched on 9 January 1916, then commissioned on 10 March 1916, until 8 July 1916 under command of Kptlt. Erich Günzel, first and last commanding officer. She made two patrols with the I Flotilla in the North Sea after two months of training in May-June at the Kiel School. She sunk no ship and on 8 July 1916 in her second sortie while laying mines off Kinnaird Head, Scotland she was sunk around midnight due to a probably mine mishandling accident, with all hands lost.

U78 (1916)

U78 was ordered from Vulcan, Hamburg (Werk 60) on 9 March 1915, launched on 27 Feb 1916 and commissioned on 20 Apr 1916, until 15 Jan 1918 under Kptlt. Otto Dröscher, then until 31 January under Oblt. (R) Karl Thouret, until 27 February Oblt. Johann Vollbrecht, until 26 April under Kptlt. Karl Vesper, Wilhelm Meyer and until 27 Oct. 1918 Oblt. Johann Vollbrecht, making 12 patrols as part of the I Flotilla and sinking 16 ships (26,678 tons), damaging two (11,332 tons) and taking two as prize (3,427 tons) sinking also the 810 tons HMS Jason, and the 216t HMT Loch Shiel, 184t HMT Lobelia. On 27 Oct. 1918 she was surprised and torpedoed by the British submarine HMS G2 N in the North Sea with all hands lost.

U79 (1916)

U79 was laid down and ordered at Vulcan, Hamburg (Werk 61) on 9 March 1915, launched on 9 Apr 1916 and commissioned on 25 May. Until 20 Feb. 1917 she was under command of Kptlt. Heinrich Jeß, then until 26 Oct. 1917 under Kptlt. Otto Rohrbeck, until 23 Nov. Kptlt. Otto Dröscher, until 15 April 1918 Oblt. (R) Karl Thouret, until 17 August Oblt. Rudolf Zentner and until 26 Aug 1918 Oblt. Martin Hoffmann, then until 15 Sept. Ltn. Rudolf (i.V.) Haagen, until 14 Oct. 1918 Kptlt. Woldemar Petri and until surrender on 11 Nov. 1918 under Oblt. Kurt Slevogt. All in the I Flotilla, claiming 22 ships sunk (34,479 tons), two damaged (7,474 tons), one taken as prize (1,125 tons) and sinking the 14,300 tons armoured cruiser HMS Drake on 2 October 2017, her biggest kill by Heinrich Jeß. She also sank the armed trawlers HMT Corientes (280t) and HMT Charles Astie (295t) and damaged the 790 tons HMS Brisk and liner Camito. Surrendered at V-Day and was allocated to France. She became the French submarine Victor Reveille, and was active until sold and BU in 1935, the longest career of the class.

U80 (1916)

U80 was ordered and laid down at Vulcan, Hamburg (Werk 62) on 9 March 1915, launched on 22 Apr 1916 and commissioned on 6 Junr 1916, under Kptlt. Alfred von Glasenapp until 31 Jul 1917, then until 30 Oct. Kptlt. Gustav Amberger, until 22 Dec. 1917 Kptlt. Karl Scherb and until her surrender on 11 Nov. 1918 Kptlt. Karl Koopmann. In total she made 17 patrols with the I Flotilla and sank 25 ships for 48,880 tons four damaged for 35,608 tons inc. the HMS Motagua, and sank the sloop HMS Pheasant armed trawlers HMT Kirkland, HMT Senator, HMT Plethos and sloop HMS Blackmorevale. But her biggest kill was the 14,892 tonnes armed merchant cruiser HMS Laurentic on 25 January 1917. She surrendered and on 16 January 1919 was turned to the British which had her broken up at Swansea.