Typ Tanga, German Aviation Support Ship laid down 1942
Displacement: 6,857 t light; 7,198 t standard; 16,623 t normal; 24,163 t full load
Dimensions: Length overall / water x beam x draught
452.86 ft / 439.30 ft x 61.02 ft x 31.00 ft (normal load) [138.03 m / 133.90 m x 18.60 m x 9.45 m]
Armament:
2 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1938 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, all raised mounts
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread
Weight of broadside 48 lbs / 22 kg
Shells per gun, main battery: 300
Armour:
Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: - 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
Machinery:
Diesel Internal combustion motors, Geared drive, 1 shaft, 9,506 shp / 7,092 Kw = 16.00 kts
Range 73,250nm at 14.00 kts
Bunker at max displacement = 16,964 tons
Complement: 731 - 951
Cost: £1.780 million / $7.122 million
Distribution of weights at normal displacement:
Armament: 6 tons, 0.0 %
Armour: 3 tons, 0.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 248 tons, 1.5 %
Hull, fittings & equipment: 3,250 tons, 19.6 %
Fuel, ammunition & stores: 9,766 tons, 58.7 %
Miscellaneous weights: 3,350 tons, 20.2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship): 56,764 lbs / 25,748 Kg = 2,730.0 x 3.5 " / 88 mm shells or 7.5 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 3.2 ft / 1.0 m
Roll period: 14.3 seconds
Steadiness - As gun platform (Average = 50 %): 80 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.700
Length to Beam Ratio: 7.20: 1
'Natural speed' for length: 20.96 kts
Power going to wave formation at top speed: 39 %
Trim (Max stability = 0, Max steadiness = 100): 40
Bow angle (Positive = bow angles forward): 25.00 degrees
Stern overhang: 2.46 ft / 0.75 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 23.79 ft / 7.25 m
- Forecastle (20 %): 22.64 ft / 6.90 m (21.98 ft / 6.70 m aft of break)
- Mid (50 %): 21.98 ft / 6.70 m
- Quarterdeck (20 %): 21.98 ft / 6.70 m
- Stern: 21.98 ft / 6.70 m
- Average freeboard: 22.20 ft / 6.77 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 28.6 %
- Above water (accommodation/working, high = better): 122.2 %
Waterplane Area: 21,343 Square feet or 1,983 Square metres
Displacement factor (Displacement / loading): 427 %
Structure weight / hull surface area: 86 lbs/sq ft or 420 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.63
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Low-stowed cargo simmed as additional bunkers
Bunkers for 15,000 nm radius at 14 knots = 1996 tons; remainder represents low-stowed cargo
Aviation fuels - 4,600 tons; Fresh water - 1,500 tons; Diesel oil 2,000 tons; Dry stores - 5,000 tons. Total 13,100 tons
Breakdown of miscellaneous weight:
Two 56-ton catapults and handling equipment - 250 tons
Repair and maintenance facilities - 1000 tons
Enhanced deck handling gear - 350 tons
Provision for ten embarked seaplanes - 250 tons
Storerooms for spares, equipment and ordnance - 800 tons
Accommodations for aircraft repair and service personnel (250 @ 2-tons per) - 500 tons
Accommodations for embarked air crew (100 @ 2-tons per) - 200 tons
Recreational spaces and amenities - 300 tons
Cost to acquire and convert as naval auxiliary - 1715 tons
Time to convert - 120 days
Tanga – Conversion begun 1 Jan 1942; conversion complete 1 May 1942
Tsingtau - Conversion begun 1 July 1942; conversion complete 29 Oct 1942