Ok, new ships for 1925, I´m going to post a few of them, beginning with this little one.
These are the first light cruisers of the RN that have their main armament in turrets.
Small units, they´ll replace the older Boadicea class cruisers that will be decomissioned shortly after this class enter service. Lacking a seaplane, this class is most likely to be used as destroyer leader. They can be fitted for minelaying or armed with depth charges in case it´s necessary.
HMS Diana
HMS Apollo
HMS Minerva
Diana class, British Light Cruiser, laid down 1925
Displacement:
4.685 t light; 4.830 t standard; 5.138 t normal; 5.363 t full load
Dimensions: Length overall / water x beam x draught
445,89 ft / 440,00 ft x 44,00 ft x 18,00 ft (normal load)
135,91 m / 134,11 m x 13,41 m x 5,49 m
Armament:
6 - 5,50" / 140 mm guns (3x2 guns), 83,19lbs / 37,73kg shells, 1925 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority aft, 1 raised mount aft - superfiring
6 - 4,00" / 102 mm guns in single mounts, 32,00lbs / 14,51kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, all amidships
4 - 1,57" / 40,0 mm guns (1x4 guns), 1,94lbs / 0,88kg shells, 1925 Model
Anti-aircraft guns in deck mount
on centreline aft
8 - 0,79" / 20,0 mm guns (4x2 guns), 0,24lbs / 0,11kg shells, 1925 Model
Anti-aircraft guns in deck mounts
on side, all amidships
Weight of broadside 701 lbs / 318 kg
Shells per gun, main battery: 100
8 - 21,0" / 533,4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1,50" / 38 mm 416,00 ft / 126,80 m 8,00 ft / 2,44 m
Ends: Unarmoured
Main Belt covers 145 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3,50" / 89 mm 1,00" / 25 mm 1,00" / 25 mm
2nd: 1,00" / 25 mm - -
3rd: 0,50" / 13 mm - -
4th: 0,50" / 13 mm - -
- Armour deck: 0,80" / 20 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 64.668 shp / 48.242 Kw = 32,00 kts
Range 8.000nm at 10,00 kts (Bunkerage = 554 tons)
Complement:
303 - 394
Cost:
£1,740 million / $6,958 million
Distribution of weights at normal displacement:
Armament: 88 tons, 1,7 %
Armour: 463 tons, 9,0 %
- Belts: 196 tons, 3,8 %
- Torpedo bulkhead: 0 tons, 0,0 %
- Armament: 80 tons, 1,6 %
- Armour Deck: 187 tons, 3,6 %
- Conning Tower: 0 tons, 0,0 %
Machinery: 2.100 tons, 40,9 %
Hull, fittings & equipment: 2.023 tons, 39,4 %
Fuel, ammunition & stores: 453 tons, 8,8 %
Miscellaneous weights: 12 tons, 0,2 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
3.307 lbs / 1.500 Kg = 39,8 x 5,5 " / 140 mm shells or 0,6 torpedoes
Stability (Unstable if below 1.00): 1,22
Metacentric height 2,1 ft / 0,6 m
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0,56
Seaboat quality (Average = 1.00): 1,04
Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0,516
Length to Beam Ratio: 10,00 : 1
'Natural speed' for length: 20,98 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 15,00 degrees
Stern overhang: 0,00 ft / 0,00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 22,00 ft / 6,71 m
- Forecastle (10 %): 21,00 ft / 6,40 m
- Mid (50 %): 21,00 ft / 6,40 m
- Quarterdeck (35 %): 13,00 ft / 3,96 m (21,00 ft / 6,40 m before break)
- Stern: 13,00 ft / 3,96 m
- Average freeboard: 18,24 ft / 5,56 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 145,3 %
- Above water (accommodation/working, high = better): 119,2 %
Waterplane Area: 12.619 Square feet or 1.172 Square metres
Displacement factor (Displacement / loading): 96 %
Structure weight / hull surface area: 81 lbs/sq ft or 395 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0,90
- Longitudinal: 2,59
- Overall: 1,00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate