![]() U-505, a type IXC U-boat | |
Class overview | |
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Name | Type IX |
Operators | |
Preceded by | Type I |
Succeeded by | Type XXI |
Subclasses |
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Built | 1937-1945 |
In service | 1938-1945 |
Planned | 290 |
Building | 195 |
Completed | 194 |
Cancelled | 95 |
Preserved | 2 |
General characteristics | |
Propulsion |
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Speed | |
Range |
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Test depth | 230 m (750 ft) |
Complement | 48 to 56 (55 to 63 in Type IXD) |
Armament |
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The Type IX U-boat was designed by Nazi Germany's Kriegsmarine in 1935 and 1936 as a large ocean-going submarine for sustained operations far from the home support facilities. It was derived from the Type IA and appeared in various sub-types. [1] [2] [a]
Type IXs had six torpedo tubes; four at the bow and two at the stern. They carried six reloads internally and ten spare torpedoes externally in pressure-tight containers. Type IX boats could also be fitted for mine operations; as mine-layers they could carry 44 TMA or 60 TMB mines. [3]
Secondary armament was provided by one 10.5 cm (4.1 in) deck gun with 180 rounds. Anti-aircraft armament differed throughout the war.
The Anglo-German Naval Agreement of 1935 allowed Germany to build a U-Boat fleet of 22,050 t (21,700 long tons). Parts for two Type I, twenty-four Type II and ten Type VII U-boats had already been produced before the conclusion of the agreement and these thirty-six U-boats comprising 12,500 t (12,300 long tons) were built within the year. The German Navy wanted to spend the remaining 9,950 t (9,790 long tons) on a large 750 t (740 long tons) U-boat, capable of operating in the Mediterranean Sea. In order to speed up construction, the existing Type I design was modified to fulfill the extra requirements. To improve speed, a more powerful diesel engine was installed. The upper deck was widened so that ten spare torpedoes could be stored below in water-tight containers. [4]
The first four Type IX U-boats were ordered on 29 July 1936 from DeSchiMAG AG Weser in Bremen, [5] and on 21 November a further four were ordered from the same yard. [6] The eight U-boats were commissioned in 1938-39. Six were lost in action and two were scuttled at the end of the war. [7]
On 17 July 1937 the British amended the Anglo-German Naval Agreement for an expansion of their submarine fleet. As a consequence Germany was also allowed more tonnage for their U-boats and part of this tonnage was used to order two Type IXB on 21 July. The Type IXB was a identical to the Type IXA, except for a wider outer hull, [6] which increased fuel storage to 165 t (162 long tons). [8] In 1938, the Germans invoked a clausule of the Anglo-German Naval- Agreement which allowed them to build submarines in parity with the British. A further eight Type IXB were ordered on 24 May 1938 and a ninth was ordered on 9 Augustus. [9] A total of fourteen Type IXB was ordered from DeSchiMAG AG Weser in Bremen. These U-boats were commissioned in 1939-40. Thirteen were sunk in the course of the war, the remaining one was decommissioned and sabotaged when Lorient Submarine Base was evacuated in 1944. [10] [11]
The Type IXC had again a wider outer hull, with storage for an additional 43 tonnes of fuel, increasing the boat's range. This series omitted the control room periscope leaving the boats with two tower scopes. [12] The 35 boats of U-162 through U-170 and U-505 through U-550 were not fitted for mine operations. [13]
The first ten Type IXC were ordered on 7 August 1939. [14] Three shipyards, DeSchiMAG AG Weser and Seebeckwerft of Bremen, and Deutsche Werft of Hamburg built 54 Type IXC submarines, which were commissioned in 1941-42. 49 Type IXC U-boats were lost. Two were decommissioned in French ports and could not be evacuated to Germany when the Allies overran France in 1944. [15] One was given to Japan as a gift from Hitler, one surrendered at the end of the war, and U-505 was captured at sea and survives at the Museum of Science and Industry in Chicago. [16] [15]
Type IXC/40 was an improved Type IXC with slightly increased range. [17] The 87 Type IXC/40 U-boats built at DeSchiMAG AG Weser and Seebeckwerft of Bremen, and Deutsche Werft of Hamburg were commissioned in 1942-44. [18] After the decision of Karl Dönitz on 13 August 1943 to focus on the construction of the new Elektroboote, on 30 September 1943, the outstanding order for 71 Type IXC/40 was cancelled. [19] 64 Type IXC/40 were lost in action, four were decommissioned before the end of the war, two were scuttled, one was transferred to the Japanese Navy and sixteen surrendered. [18] The Type IXC/40 U-534 was sunk on 5 May 1945, but raised and is on display at Woodside Ferry Terminal, Birkenhead. [20] [21]
After the cancelling of the Type XI U-cruisers at the beginning of the war which were intended for patrols against independently sailing vessels in remote areas, Dönitz sought a way to replace these U-cruisers with an existing design that could be modified without much impact on existing U-boat production. The solution was to adapt the Type IXC into two designs : a high-speed Type IXD1 and a long-range Type IXD2. On 28 May 1940 the first IXD U-boats were ordered. [22] Only two Type IXD1 U-boats were built, [23] U-180 was commissioned on 10 December 1941 and U-195 on 8 April 1942. [24]
The Type IXD1 was significantly longer and heavier than the IXC/40. It had three pairs of 20-Cylinder, four-stroke Daimler Benz MB501 diesels, which were also used for E-boats, with a total of 9,000 bhp (6,700 kW). [23] This installation was not successful: it produced too much exhaust smoke, and the heat in the engine room was unbearable because of defective cooling. [25] [26] Since they not fit for war patrols, it was decided in the autumn of 1943 to convert the two Type IXD1 U-boats in transport U-boats. They had their torpedo tubes removed and the six diesel engines were replaced with two Type VIIC 3,200 bhp (2,400 kW) Germaniawerft F46 diesel engines. [27] As a consequence top speed dropped to 15.8 kn (29.3 km/h; 18.2 mph). [28] In their new role they could transport 252 tonnes of cargo. [27]
Apart from the two standard MAN M9V40/46 diesel engine totalling 4,400 hp (3,300 kW; 4,500 PS), the Type IXD2 had two extra six-cylinder, four-stroke MWM RS34S diesel generators totalling 1,000 hp (750 kW; 1,000 PS) for economical cruising. [29] The IXD2 had a range of 23,700 nautical miles (43,900 km; 27,300 mi) at 12 kn (22 km/h; 14 mph) [30] and 31,500 nautical miles (58,300 km; 36,200 mi)10 kn (19 km/h; 12 mph). The IXD/42 was almost identical. [31] Most of the Type IXD2 were sent to patrols in the Indian Ocean as part of the Monsun Gruppe and were equipped with a Focke-Achgelis Fa 330 rotor kite which was stored in two watertight vertical canister behind the conning tower. [32]
The first two Type IXD2 U-boats were ordered on 15 August 1940. [17] DeSchiMAG AG Weser of Bremen built 28 Type IXD2 U-boats, which were commissioned in 1942-44. [29] Following the decision by Dönitz to stop building conventional U-boats, the orders for 22 Type IXD/42 U-boats was cancelled. Only two that were already under construction by DeSchiMAG AG Weser of Bremen, were continued. Only U-883 was launched on 28 April 1944 and commissioned 27 March 1945, and surrendered at the end of the war. The other Type IXD/42 U-884 was launched on 17 May 1944 but was badly damaged on 30 March 1945 by US bombs while still in the dockyard and never commissioned. [19] [31]
Class | IXA [13] | IXB [13] | IXC [13] | IXC/40 [13] | IXD1 [42] | IXD2 [8] | IXD/42 [8] |
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Displacement surfaced | 1,032 t (1,016 long tons) | 1,051 t (1,034 long tons) | 1,120 t (1,100 long tons) | 1,144 t (1,126 long tons) | 1,610 t (1,580 long tons) | 1,616 t (1,590 long tons) | 1,616 t (1,590 long tons) |
Displacement submerged | 1,152 t (1,134 long tons) | 1,178 t (1,159 long tons) | 1,232 t (1,213 long tons) | 1,257 t (1,237 long tons) | 1,799 t (1,771 long tons) | 1,808 t (1,779 long tons) | 1,808 t (1,779 long tons) |
Length overall | 76.50 m (251 ft 0 in) | 76.50 m (251 ft 0 in) | 76.76 m (251 ft 10 in) | 76.76 m (251 ft 10 in) | 87.58 m (287 ft 4 in) | 87.5 m (287 ft 1 in) | 87.5 m (287 ft 1 in) |
Length pressure hull | 58.75 m (192 ft 9 in) | 58.75 m (192 ft 9 in) | 58.75 m (192 ft 9 in) | 58.75 m (192 ft 9 in) | 68.50 m (224 ft 9 in) | -- | -- |
Beam overall | 6.51 m (21 ft 4 in) | 6.76 m (22 ft 2 in) | 6.76 m (22 ft 2 in) | 6.86 m (22 ft 6 in) | 7.50 m (24 ft 7 in) | 7.50 m (24 ft 7 in) | 7.50 m (24 ft 7 in) |
Beam pressure hull | 4.40 m (14 ft 5 in) | 4.40 m (14 ft 5 in) | 4.40 m (14 ft 5 in) | 4.40 m (14 ft 5 in) | 4.40 m (14 ft 5 in) | -- | -- |
Height | 9.40 m (30 ft 10 in) | 9.60 m (31 ft 6 in) | 9.60 m (31 ft 6 in) | 9.60 m (31 ft 6 in) | 10.20 m (33 ft 6 in) | -- | -- |
Draft | 4.70 m (15 ft 5 in) | 4.70 m (15 ft 5 in) | 4.70 m (15 ft 5 in) | 4.67 m (15 ft 4 in) | 5.35 m (17 ft 7 in) | 5.35 m (17 ft 7 in) | 5.35 m (17 ft 7 in) |
Power surfaced (diesel) [43] | 4,400 hp (3,300 kW) | 9,000 hp (6,700 kW) | 5,400 hp (4,000 kW) | 5,400 hp (4,000 kW) | |||
Power submerged (Electric) [43] | 1,000 hp (750 kW) | ||||||
Surface speed | 18.2 kn (33.7 km/h; 20.9 mph) | 18.2 kn (33.7 km/h; 20.9 mph) | 18.3 kn (33.9 km/h; 21.1 mph) | 18.3 kn (33.9 km/h; 21.1 mph) | 20.8 kn (38.5 km/h; 23.9 mph) | 19.2 kn (35.6 km/h; 22.1 mph) | 19.2 kn (35.6 km/h; 22.1 mph) |
Submerged speed | 7.7 kn (14.3 km/h; 8.9 mph) | 7.3 kn (13.5 km/h; 8.4 mph) | 7.3 kn (13.5 km/h; 8.4 mph) | 7.3 kn (13.5 km/h; 8.4 mph) | 6.9 kn (12.8 km/h; 7.9 mph) | 6.9 kn (12.8 km/h; 7.9 mph) | 6.9 kn (12.8 km/h; 7.9 mph) |
fuel capacity [44] | 154 t (152 long tons) | 165 t (162 long tons) | 208 t (205 long tons) | 214 t (211 long tons) | 203 t (200 long tons) | 442 t (435 long tons) | 442 t (435 long tons) |
Surface range at 10 knots | 10,500 nmi (19,400 km; 12,100 mi) | 12,000 nmi (22,000 km; 14,000 mi) | 13,450 nmi (24,910 km; 15,480 mi) | 13,850 nmi (25,650 km; 15,940 mi) | 12,750 nmi (23,610 km; 14,670 mi) | 31,500 nmi (58,300 km; 36,200 mi) | 31,500 nmi (58,300 km; 36,200 mi) |
Surface range at 12 knots [44] | 8,100 nmi (15,000 km; 9,300 mi) | 8,700 nmi (16,100 km; 10,000 mi) | 11,000 nmi (20,000 km; 13,000 mi) | 11,400 nmi (21,100 km; 13,100 mi) | 9,900 nmi (18,300 km; 11,400 mi) | 23,700 nmi (43,900 km; 27,300 mi) | 23,700 nmi (43,900 km; 27,300 mi) |
Submerged range at 4 knots | 65 nmi (120 km; 75 mi) | 64 nmi (119 km; 74 mi) | 63 nmi (117 km; 72 mi) | 63 nmi (117 km; 72 mi) | 115 nmi (213 km; 132 mi) | 57 nmi (106 km; 66 mi) | 57 nmi (106 km; 66 mi) |
Bow tubes | 4 | ||||||
Stern tubes | 2 | ||||||
Torpedoes (maximum) | 22 | 22 | 22 | 22 | 22 | 24 | 24 |