Proposed as an alternative to the purpose designed Tender A.
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Tender B German Fleet Repair and Support Ship laid down 1942
Displacement: 6,238 t light; 6,472 t standard; 11,003 t normal; 14,627 t full load
Dimensions: Length overall / water x beam x draught
423.30 ft / 406.82 ft x 56.76 ft x 23.62 ft (normal load) [129.02 m / 124.00 m x 17.30 m x 7.20 m]
Armament:
2 - 4.13" / 105 mm guns in single mounts, 35.32lbs / 16.02kg shells, 1940 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread, 1 raised mount
4 - 1.46" / 37.0 mm guns (2x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, all amidships
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread, all raised mounts
Weight of broadside 78 lbs / 35 kg
Shells per gun, main battery: 300
Armour:
Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm 0.39" / 10 mm -
2nd: 0.39" / 10 mm 0.39" / 10 mm -
3rd: 0.39" / 10 mm - -
Machinery: Diesel Internal combustion motors, Geared drive, 1 shaft, 4,665 shp / 3,480 Kw = 14.00 kts
Range 64,800nm at 12.00 kts
Bunker at max displacement = 8,155 tons
Complement: 536 - 698
Cost: £1.550 million / $6.200 million
Distribution of weights at normal displacement:
Armament: 10 tons, 0.1 %
Armour: 5 tons, 0.0 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 5 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 122 tons, 1.1 %
Hull, fittings & equipment: 2,302 tons, 20.9 %
Fuel, ammunition & stores: 4,764 tons, 43.3 %
Miscellaneous weights: 3,800 tons, 34.5 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship): 25,255 lbs / 11,455 Kg = 715.0 x 4.1 " / 105 mm shells or 3.9 torpedoes
Stability (Unstable if below 1.00): 1.10
Metacentric height 2.5 ft / 0.8 m
Roll period: 14.9 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.706
Length to Beam Ratio: 7.17: 1
'Natural speed' for length: 20.17 kts
Power going to wave formation at top speed: 33 %
Trim (Max stability = 0, Max steadiness = 100): 29
Bow angle (Positive = bow angles forward): 20.00 degrees
Stern overhang: 6.56 ft / 2.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 27.23 ft / 8.30 m
- Forecastle (20 %): 26.25 ft / 8.00 m (25.26 ft / 7.70 m aft of break)
- Mid (50 %): 17.06 ft / 5.20 m (16.40 ft / 5.00 m aft of break)
- Quarterdeck (15 %): 16.40 ft / 5.00 m
- Stern: 17.06 ft / 5.20 m
- Average freeboard: 19.93 ft / 6.07 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 43.1 %
- Above water (accommodation/working, high = better): 122.3 %
Waterplane Area: 18,498 Square feet or 1,719 Square metres
Displacement factor (Displacement / loading): 267 %
Structure weight / hull surface area: 76 lbs/sq ft or 369 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.92
- Longitudinal: 2.14
- Overall: 1.00
Hull space for machinery, storage, and compartmentation is excellent
Room for accommodation and workspaces is excellent
Excellent seaboat, comfortable, can fire her guns in the heaviest weather
Bunkers include fuel storage for other vessels.
Range = 12,000 nm on 1,591 tons; remainder, 6,000 tons, represents fuel oil carried for transfer.
Breakdown of Miscellaneous Weight
Cranes and heavy handling equipment - 500 tons
Accommodation for repair personnel - 800 tons
Engine repair shop - including tools and equipment - 700 tons
Hull repair shop - including tools and equipment - 700 tons
Ordnance repair shop - including tools and equipment - 700 tons
Boat repair shop - including tools and equipment - 400 tons
Cost to acquire and convert @25% - 1,560 tons; time to convert - 118 days