Type XXIII U-Boat Coastal Submarine (1944)
The smallish Type XXIII appeared in some 61 total operational examples by the end World War 2.
Small by design, the Type XXIII was fielded with a crew of 14 to 18 personnel and only two torpedoes. Sharing development with the Type XXI, the two systems had commonality in parts and operating philosophy. 2 x bow-facing 21" (533mm) torpedo tubes were a required part of the design and no surface deck gun was included. The Type XXIII was in design by 1942 and in construction by 1943, with the first launching in 1944. Another similarity to the XXI was that the XXIII was constructed as major sections(four for the XXIII while eight for the XXI) at separate locations only to be assembled altogether at a main yard.
Propulsion was derived from a diesel engine (when surfaced) and two electric motors (when submerged). The diesel unit consisted of an MWM brand RS134S type 6-cylinder engine developing roughly 575 horsepower. When submerged, the submarine could call upon its AEG GU4463-8 double-acting electric motor (generating up to 572 horsepower) for full undersea flight. When quietness was a requirement, the crew could elect to switch on its BBC CCR188 electric creeping motor, a system generating 35 horsepower at the cost of silence. The vessel exhibited a top surface speed of 9.7 knots but increased that when submerged to an impressive 12.5 knots. Depths of up to 590 feet were possible. Surface ranges centered on about 1,500 miles while this was curtailed heavily when submerged - limited to just 202 miles at 4 knots.
Once in the water, the Type XXIII proved to be of sound design and exhibited responsive handling in all quarters of submarine activity. A low reserve buoyancy and lack of most of its outer casing meant that the system could submerge itself in a matter of seconds, as fast as 9 or 10 seconds according to some sources. Its size, power and limited operating depth forced the craft to attack targets within close range. Conversely, its size and operational abilities allowed the vessel to utilize stealth practices to ensure it was unseen before firing its payload.
The Type XXIII operated through to the end of the Second World War to which just seven total units were lost and these to air attacks. Only three survived in the post-war months while the rest were either sunk by controlled Allied fire after capture or scuttled by their German crews. Construction was handled by Deustche Werft at Hamburg and Germaniawerft at Kiel. 48 boats were constructed at Hamburg alone. Though 280 were initially ordered, a fraction of these were constructed and eventually entered active service with only a few actually seeing combat action. Text ©2003-2013 www.MilitaryFactory.com • All Rights Reserved • No Reproduction Permitted
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Specifications for the
Type XXIII U-Boat
Coastal Submarine
Country of Origin: Nazi Germany
Initial Year of Service: 1944
Operators: Nazi Germany
Crew: 14
Length: 112ft (34.14m)
Beam: 9.9ft (3.02m)
Draught: 12.2ft (3.72m)
Displacement: 232tons
Displacement (Submerged): 256tons
Machinery: 1 x MWM RS134S 6-cylinder diesel engine developing 575hp; 1 x AEG GU4463-8 double-acting electric motor generating 572hp; 1 x BBC CCR188 electric creeping motor generating 35hp; 1 x shaft.
Surface Speed: 10kts (12mph)
Submerged Speed: 12kts (14mph)
Range: 1,555miles (2,503km)
Armament:
2 x 21" (533mm) torpedo tubes (bow facing; 2 total torpedoes)
Ship Class: Type XXIII U-Boat
Number-in-Class: 61
Ships-in-Class: U-2321; U-2322; U-2323; U-2324; U-2325; U-2326; U-2327; U-2328; U-2329; U-2330; U-2331; U-2332; U-2333; U-2334; U-2335; U-2336; U-2337; U-2338; U-2339; U-2340; U-2341; U-2342; U-2343; U-2344; U-2345; U-2346; U-2347; U-2348; U-2349; U-2350; U-2351; U-2352; U-2353; U-2354; U-2355; U-2356; U-2357; U-2358; U-2359; U-2360; U-2361; U-2362; U-2363; U-2364; U-2365; U-2366; U-2367; U-2368; U-2369; U-2371; U-4701; U-4702; U-4703; U-4704; U-4705; U-4706; U-4707; U-4709; U-4710; U-4711; U-4712
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