Admiralty class DD, Atlantis Destroyer
laid down 1916, conversion to blimp tender in 1928
Uprising and Upsurge
Displacement:
1,025 t light; 1,061 t standard; 1,244 t normal; 1,391 t full load
Dimensions: Length overall / water x beam x draught
310.00 ft / 310.00 ft x 30.00 ft x 10.50 ft (normal load)
94.49 m / 94.49 m x 9.14 m x 3.20 m
Armament:
2 - 4.50" / 114 mm guns (1x2 guns), 45.56lbs / 20.67kg shells, 1928 Model
Quick firing guns in a deck mount with hoist
on centreline forward
2 - 1.57" / 39.9 mm guns (1x2 guns), 1.93lbs / 0.88kg shells, 1928 Model
Anti-aircraft guns in deck mount
on centreline forward
4 - 0.79" / 20.1 mm guns (2x2 guns), 0.25lbs / 0.11kg shells, 1928 Model
Anti-aircraft guns in deck mounts
on side, all forward
2 - 0.79" / 20.1 mm guns in single mounts, 0.25lbs / 0.11kg shells, 1916 Model
Anti-aircraft guns in deck mounts
on side, all aft
Weight of broadside 96 lbs / 44 kg
Shells per gun, main battery: 200
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.78" / 20 mm - -
Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 9,220 shp / 6,878 Kw = 24.00 kts
Range 6,500nm at 12.00 kts
Bunker at max displacement = 331 tons
Complement:
104 - 136
Cost:
£0.154 million / $0.616 million
Distribution of weights at normal displacement:
Armament: 12 tons, 1.0 %
Armour: 3 tons, 0.3 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 3 tons, 0.3 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 344 tons, 27.6 %
Hull, fittings & equipment: 546 tons, 43.9 %
Fuel, ammunition & stores: 220 tons, 17.7 %
Miscellaneous weights: 120 tons, 9.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,462 lbs / 663 Kg = 32.1 x 4.5 " / 114 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 1.1 ft / 0.3 m
Roll period: 11.9 seconds
Steadiness - As gun platform (Average = 50 %): 70 %
- Recoil effect (Restricted arc if above 1.00): 0.23
Seaboat quality (Average = 1.00): 1.64
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.446
Length to Beam Ratio: 10.33 : 1
'Natural speed' for length: 17.61 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 43
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.00 ft / 6.10 m
- Forecastle (20 %): 18.00 ft / 5.49 m
- Mid (40 %): 10.00 ft / 3.05 m
- Quarterdeck (15 %): 10.00 ft / 3.05 m
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 12.56 ft / 3.83 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 108.1 %
- Above water (accommodation/working, high = better): 121.6 %
Waterplane Area: 5,913 Square feet or 549 Square metres
Displacement factor (Displacement / loading): 137 %
Structure weight / hull surface area: 48 lbs/sq ft or 235 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.95
- Longitudinal: 2.62
- Overall: 1.05
Hull space for machinery, storage, compartmentation is adequate
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