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The type XXIII were designed and ordered in 1943 as small twin (superimposed) hull vessel for coastal waters operations. The larger diameter upper hull contained the crews quarters, engines and torpedo tubes. The smaller lower hull contained some of the fuel, stores and batteries, hull was of streamlined design and built in four large pre-fabricated sections, these were then transported to and assembled on the shipyard slip-ways.
These small craft had quite a handy performance, surfaced range at 6 knots was 4,400 nm, high submerged speed was 12.5 knots with a submerged endurance at 10 knots of over 4 hrs, likewise at 4 knots she could keep down for over 2 days. Maximum submerged depth was 500 ft and crash dive time was under 9 seconds, an ‘at sea’ endurance of nearly 40 days.
Although over 200 were ordered, only 62 were commissioned into service, not many actually survived the war, most falling victim to bombing raids and being scuttled by their crews a end of hostilities, some were taken into service with allied nations after the war, two were salvaged in 1956 and saw service for some years in the navy of the FRG.
- Displacement: 234 tons surfaced, 258 submerged
- Length: 34.7m (113ft 10in) overall, 26m (85ft 4in) pressure hull
- Beam: 3m (9ft 10in)
- Draught: 3.67m (12ft)
- Height: 7.7m (25ft 3in)
- Propulsion: Diesel/Electric, 1x MWM RS134S 6 cylinder diesel engine, 575hp, 1x AEG GU4463-8 double acting electric motor, 572 hp, 1x BBC CCR188 electric creeping motor, 35 hp
- Speed: 9.7 knots (18 km/h) surfaced, 12.5 knots (23 km/h) submerged
- Range: 2600nm at 8 knots (4800 km at 15 km/h) surfaced, 194 miles (359 km) at 4 knots (7 km/h) submerged
- Torpedoes: two bow tubes
- Complement: 14-18 men
- Maximum depth: 180 m
- Scale = 1 to 32
- Model Length = 42 3/4"
- Hull Beam = 4 1/2"
- Height = 11"
Reference data at -
http://en.wikipedia.org/wiki/Type_XXIII_U-boat
http://uboat.net/types/xxiii.htm
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