Diana class, Canadian (Ex-British) Light Cruiser laid down 1925
HMCS Diana
HMCS Apollo
HMCS Minerva
Displacement:
4,698 t light; 4,895 t standard; 5,205 t normal; 5,452 t full load
Dimensions: Length overall / water x beam x draught
445.89 ft / 440.00 ft x 44.00 ft (Bulges 46.00 ft) x 18.00 ft (normal load)
135.91 m / 134.11 m x 13.41 m (Bulges 14.02 m) x 5.49 m
Armament:
4 - 5.50" / 140 mm guns (2x2 guns), 83.19lbs / 37.73kg shells, 1940 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread
1 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1945 Model
Automatic rapid fire gun in a deck mount with hoist
on side amidships, 1 raised gun
12 - 2.24" / 57.0 mm guns (6x2 guns), 5.65lbs / 2.56kg shells, 1940 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline, all aft
8 - 1.57" / 40.0 mm guns (1x8 guns), 1.95lbs / 0.89kg shells, 1940 Model
Anti-aircraft guns in deck mount
on side, all raised guns
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1940 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 501 lbs / 227 kg
Shells per gun, main battery: 300
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
2nd: 2.00" / 51 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
- Armour deck: 0.80" / 20 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 65,035 shp / 48,516 Kw = 32.00 kts
Range 8,000nm at 10.00 kts
Bunker at max displacement = 557 tons
Complement:
306 - 398
Cost:
£1.711 million / $6.844 million
Distribution of weights at normal displacement:
Armament: 75 tons, 1.4 %
Armour: 229 tons, 4.4 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 38 tons, 0.7 %
- Armour Deck: 191 tons, 3.7 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 2,112 tons, 40.6 %
Hull, fittings & equipment: 1,817 tons, 34.9 %
Fuel, ammunition & stores: 507 tons, 9.7 %
Miscellaneous weights: 465 tons, 8.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
2,708 lbs / 1,228 Kg = 32.6 x 5.5 " / 140 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.19
Metacentric height 2.0 ft / 0.6 m
Roll period: 13.6 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.35
Seaboat quality (Average = 1.00): 1.07
Hull form characteristics:
Hull has low quarterdeck
Block coefficient: 0.500
Length to Beam Ratio: 9.57 : 1
'Natural speed' for length: 20.98 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 48
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): 152.8 %
- Above water (accommodation/working, high = better): 168.6 %
Waterplane Area: 12,899 Square feet or 1,198 Square metres
Displacement factor (Displacement / loading): 94 %
Structure weight / hull surface area: 72 lbs/sq ft or 352 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.80
- Longitudinal: 2.37
- Overall: 0.90
Caution: Hull subject to strain in open-sea
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is excellent
20 tons for additional weight of DP automatic mounts (10 tons per)
20 tons for additional weight and ammunition for 5.5"/65 Mark VI
60 tons for Landing craft and Davits
300 tons for 150 troops and support vehicles
65 tons for Electronics fit, C3 facilities, superior this-and-that
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Diana class, British Light Cruiser, laid down 1925
HMCS Diana
HMCS Apollo
HMCS Minerva
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